Introduction:
The excavations of Lal-lo shell middens.
Hidefumi
Ogawa
Introduction
Shell
midden sites containing archaeological materials are located on the river bank
of lower Cagayan River, extending from the mouth of the river on the northern
coast of Luzon Island for a distance of 40 kilometers upriver. Site locations
varies basically in four categories, like river bank, limestone hill, inland
and coastal sand dunes. Extended areas of the shell middens are also varying
differently, from the small shell midden having 50 meters diameter to the big
one extending 500 meters long, 100 meters wide and two meters deep. But shell
species formed those middens are limited, except coastal middens, shell middens
are predominantly composed by locally called Kabibi, fresh water bivalve shell.
Carbon 14 dating of the shell middens is from 3,000BP to 1,000BP (1).
Standing
on those shell middens, many questions come out; why this kind of big size of
shell middens were formed? How was the formation process? How was the
subsistence of the prehistoric people formed those shell middens? Was the shell
gathering activities subsidiary to their farming? Or, shell gathering was
specialized as their main subsistence activities? How their subsistence
activities like hunting, gathering, fishing, farming were conducted, besides
shell gathering? How the microenvironments surrounding the sites like the
riverbank, inland plain, limestone hill and coastal shore were utilized for
those activities? How were the economic, social and political relationships
with other prehistoric groups around the shell gathering people, occupying the
particular place for shell as a subsistence resource?
Having
those many questions, we started the research on these shell middens. This is
the preliminary report of our research from 1995 to 1997. Research area is
covered from the Cagayan River bank to its eastern inland hilly area. For the
introduction of the report, in this chapter, we explain the research rationales
and the general settings of the research area, natural and geological settings,
history of the area, and the settings of each archaeological shell midden sites
from the mouth of the river to upstream.
1.
Research Rationales
Brief
history of the research conducted in Lal-lo Shell Middens.
Israel
Cabanilla and Yoji Aoyagi, the researchers of National Museum of the
Philippines, conducted the first research of the shell middens in Lal-lo in
1971 at the Magapit sites. These sites were discovered by chance, during the
excavations of the Cabalwanian sites at the west bank of the Cagayan River. The
vehicles of the research team were supplied gasoline by the Shell Oil Company
at their oil tanks in Aparri, Cagayan. On the way to Aparri, they found the
shell deposit and pottery sherds beside the national highway No. 5 at Magapit,
because the highway was under construction for the widening of road, and
cutting down the limestone cliff beside the highway.
Excavation
of the shell midden in Magapit was conducted in 1971 (Cabanilla 1972), and four
excavation areas of 2 x 2m square were set (site number:II-71-LL1 to 4) on the
limestone hill of 10 to 20m above mean sea level (M.S.L.). The location of 1971
excavation is corresponding to the location 1 of Magapit Shell middens explored
in 1986 by the national museum team including the author (Ogawa and Aguilera
1992). Red-slipped potteries of different shapes with decoration like dot
punctuation and incision, stone adzes, bones and bivalve shells were collected
by the excavation (Cabanilla 1972). Clay pendant or earring like water buffalo
horn revealed during this excavation was designed to the symbol of the Cagayan
Provincial Museum.
Through
the 1970乫s, Israel Cabanilla, Yoji Aoyagi and Roberto Santiago have continued
the exploration in Lal-lo shell middens, and discovered Bangag site, in front
of Magapit site, other side of Cagayan River, and Lal-lo Centro site (Aoyagi
1977). During their explorations, these researchers recognized already that
those shell middens produced two types of potteries, Red-slipped and Black
pottery, and that these potteries were never found together from the same site.
They noticed that it could be the difference of pottery tradition in chronology
(Aoyagi 1973:89, 1974:47, 1976, 1979, 1981, Aoyagi and Tanaka 1985). Barbara Thiel excavated Magapit site in 1978
after the research of Arku and Musang Cave in Peñablanca, 80 km south of Lal-lo
(Thiel 1989). Rich archaeological materials were revealed, red-slipped
potteries of different shapes, coarsely made potteries without red-slip, clay
ornaments and stone adzes.
In
the early 1980乫s, Aoyagi had continued the explorations in Cagayan, not only
Lal-lo shell middens, but also culturally and chronologically related sites
upriver along the Cagayan River, like Carig site, Tuguegarao and Lanna site in
Solana (Aoyagi 1983). At 1986, National Museum team and the author started the
explorations on the Lower Cagayan River area, including Lal-lo, from the mouth
of the river to municipality of Gattaran, about 40 km upriver. The purpose of
these explorations was basically same as the present research in Lal-lo. First
aim was for the establishment of local chronology in the area. Data of the
characteristics of shell middens such as size, depth, location, artifacts and
ecofacts derived from each site by the surface finding, could be useful for the
establishment of relative chronology in this area. Second aim of the research
was to approach to the one of the biggest problems in Southeast Asian
Archaeology, contemporaneous existence of the groups having the different
technological background. In the research area, Negrito people,
hunter-gatherers in Northern Luzon, are living in the hinterland of Cagayan
River alluvial plain, and established the economic and social relationships
with lowland farmers. How long had continued hunter-gatherers and farmer
relationships from the prehistoric time to the recent? Resolving this problem,
at the first stage of this purpose, we conducted the site exploration from the
alluvial plain to the hinterland in Lal-lo.
Twenty-one
shell middens containing the archaeological materials are recognized along the
Lower Cagayan River and coastal sand dune by the exploration (Aoyagi, Aguilera, Ogawa and Tanaka 1986, Ogawa and
Aguilera 1992). Beside this lowland exploration, the hinterland exploration did
not carry out until 1996 because of the political situation of the area.
Artifacts collected from the surface of these sites indicate the several
cultural phases among those shell midden sites. Shell middens, which produce
red-slipped pottery, don乫t produce black pottery at the same time. Magapit
shell middens produce red-slipped pottery, but the other riverbank shell
middens like Bangag, Santa Maria, Catayauan site, produce black pottery. No
shell middens produce both types of pottery together. Stone adzes are almost
collected at Magapit and Bangag site, and only one or two fragments of stone
adzes from Santa Maria and Catayauan site. Almost the Chinese ceramics
collected are blue and white from Santa Maria, Catayauan, Lal-lo Centro,
Camalaniugan sites. These shell middens are possibly classified into the
different groups of cultural phases or chronological order. Such as, Magapit仺Bangag仺Santa Maria, Catayauan,
Lal-lo Centro, Camalaniugan. To
resolve this chronological problem and collect the ecological data for the
reconstruction of prehistoric subsistence, the excavations of shell middens
started from 1987 in Magapit, Catayauan and San Lorenzo (western bank of the
river, in front of Catayauan site).
The
excavations of Lal-lo shell middens started from Catayauan site. Catayauan
shell midden is thickly formed, site area extends widely, and shell gathering
still continuously performs by village people. The excavation was conducted to
reconstruct the depositional process of shell midden formation, revealing shell
deposit, layer by layer. Shell layers revealed were processed by water
separation and floatation to collect the ecofacts like animal bones and plant
remains. Different species of shells were counted by each piece and percentage
of materials revealed from each layer was calculated. Beside these ecofacts.
artifacts were revealed only black pottery in small fragments. Catayauan
excavation delineated the characteristics of shell midden formation and its
possible depositional process by the disposal of foodstuffs and utensils of
prehistoric people (Aoyagi, Aguilera, Ogawa and Tanaka 1988). But new question
came out from the results of the excavation; did the prehistoric people utilize
that huge amount of shell only for their foodstuffs? Ethnoarchaeological
research of the present shell gathering in Catayauan had conducted after the
excavation (Ogawa 1997).
Magapit
shell midden excavations are also conducted in 1987. Excavation spots were
selected at the highest location in Magapit sites. Hill Top site is located at
50 meters above M.S.L., four meters square was set for excavation. 5.5 meters
deep shell deposit was excavated. Cliff site at 25 meters above M.S.L. also
excavated 2 x 2 meters square. Big amount of artifacts and ecofacts were
collected from both excavation spots, such as different types of red-slipped
pottery, jar, bowl with dot punctuation and incision, coarse type of bowl
without red-slip, stove, clay, stone and bone ornaments, stone adzes (Aoyagi,
Aguilera, Ogawa and Tanaka 1988, 1991, 1993, Tanaka 1993, 1996, Aoyagi, Ogawa,
Tanaka 1996).
Datings
of these shell middens are available; Catayauan site about 1,000BP and Magapit
Hill Top site about 2,800BP.
San
Lorenzo shell midden is located on the west bank of Cagayan River, about ten meters
above M.S.L. The site was recognized during the exploration in 1988. San
Lorenzo village people, Ibanag and Ilocano, also perform the shell gathering at
the present day. Three shell layers and two silty clay layers were revealed in
4 x 2 meters square. The deepest shell layer reached to 2.5 meters and produced
the Chinese blue and white ceramic sherd belonging to 16th Century.
Depositional order of shell and silty clay layers, arranged alternatively,
indicates that the flood brought silt to the site, but shell gathering was
continued even after the inundation. Artifacts revealed from the deepest
portion of the shell midden showed that the deposition of shell and silt layers
was quickly performed, during about four hundred years (Aoyagi, Aguilera, Ogawa
and Tanaka 1991, Tanaka 1993, 1996).
In
the perspectives of cultural relationships with other areas in South China Sea
like Taiwan, South China and Vietnam, Stone and Clay pendants from Magapit site
shows its similarities in typology and dating. Unexpectedly some inquiries were
made about the red-slipped pottery from Magapit site by Oceanic archaeologists
in the relationship with Lapita pottery. For the study of cultural
relationships with adjacent area, further research and more data are needed,
but the significance of our results are recognized even at the first stage of
our study.
Shell
Middens in Southeast Asia and South China had been the special issue of study
for archaeologists belonged to the Japan Society for Southeast Asian
Archaeology since 1992 to 1993, and they recognized its importance. Especially,
Lal-lo Shell Middens are noticed as one of the biggest shell middens in
Southeast Asia and South China.
After
three years of research on the shell middens in the Lower Cagayan River,
analyses of findings had continued until the middle of 1990乫s. New project has
conducted from 1995 to 1997 in the same research area for the further study and
resolution of old and new questions on the prehistory of this area.
2. The
problems and purposes of the research
Our
researches in 1980乫s are limited to the riverbank shell midden exploration and
excavation. Twenty-one shell middens were explored and three of them were
excavated. Further research must be conducted, not only the sites located on
the riverbank, but also in the hinterland, limestone hilly area. Then, new
research term started from 1995 for three years. The problem and purposes of
the research is in a same perspective to the previous project.
Problem: When we planed to conduct the Lal-lo Project
from 1986, we had the question why the hunter-gatherers still exist until the
present day in this area? It must be possible to suppose that the different
groups having the different technological background, hunter-gatherers and
farmers, exist contemporaneously in one area. In the research area, Negrito,
Agta or Ita people are living in the hinterland of Cagayan River alluvial
plain, and established the economic and social relationships with lowland
farmers. Same situation of hunter-gatherer / farmer exchange of foodstuffs and
labor was reported in the Sierra Madre Mountain, in Cagayan and Isaberra
Province (Peterson 1978, Peterson and Peterson 1977, Hutterer 1982, Headland
1986). How had the economic and social mechanism of these
hunter-gatherers/farmer relationships elaborated and continued from the
prehistoric time to the recent? It must be one of the biggest problems in
Southeast Asian archaeology.
This
problem has been discussed for long years. Isolate model for this problem was
presented by Heine Gelderun (1932). The reason why hunter-gatherers
continuously exist until present day was explained by the isolation from the
influence of outsiders who have more developed technology. Hutterer appreciates
Heine Gelderun乫s endeavor to explain the present situation of the
contemporaneous existence of hunter-gatherer and farmer. But he denied the
isolate model, because intersocial relationships or economic exchange was
observed in many cases of the Philippine Negritos (Huterer 1976). Peterson and
Peterson brought the inter-social relationships observed between
hunter-gatherers and farmers into the prehistoric situation and presented
乬exchange adaptation乭 model (1977). Headland and Bailey individually presented
the question of scarcity of carbohydrate food in tropical rain forest (Hutterer
1982, 1983, 1986, Headland 1987), and advocate that if hunter-gatherers had no
relationships with farmers, they could not find their way to rain forest. They
proposed the 乬interdependence model乭 of tropical rain forest hunter-gatherers
with farmers (Headland and Bailey 1991). Archaeologists and ethnologists
working in the Philippines have delineated the prehistoric relationships
between hunter-gatherers and farmers in the perspective of interdependence or
mutualism for last two decades. But this model or hypotheses have never tested
by the archaeological materials. Our project in Lal-lo area is conducted to
collect data and approach to this problem for the testing of these
hypotheses.
Purposes: Resolving and discussing our problem by the
archaeological method, the purposes of the project must be conducted as
follows;
1.
To clarify the process of cultural evolution in this research area, from the
beginning of agriculture to the present.
2.
and to reconstruct the each archaeological phases in the course of local
cultural evolution.
3.
To specify the factors and conditions to promote the system of
hunter-gatherer/farmer relationships.
Archaeological
Method: Archaeological
method to satisfy these purposes is projected as follows;
1. to conduct the archaeological
explorations and controlled excavations at a surveyed undisturbed parcel of
land located at the Lower Cagayan River and its hinterland to elucidate the
dating of sites.
2.
to generate the data which could aid in
establishing the subsistence strategy and palaeoenvironmental data of the area,
conducting the multi-disciplinary research in cooperating with
archaeo-scientists.
3. to delineate the settlement system
at the area based on the function of each sites.
4. to determine the chronological
sequence at the area based on relative and absolute dating.
5. To perform the ethnoarchaeological
study on the inter-social relationships between hunter- gatherers and
lowlanders, and also on the shell gathering system.
6. To refer the historical documents
of missionaries and colonial officers on the mutual activities between
hunter-gatherers and lowlanders.
7. To build up the most possible
models to infer the systems existed in the prehistoric time, using the data
collected by the above-mentioned archaeological methods.
This
report will show the part of results of our explorations and excavations in
Lal-lo area with the perspectives above mentioned.
3丏Lower Cagayan River; natural
settings, history and shell middens.
Characteristics
of Shell Middens
The three mountain ridges,
Sierra Madre, Caraballo, and Cordillera surround Cagayan Valley. Cagayan River
flows from Nueva Viscaya and crosses Isabela, Cagayan Province, and empties
into the Babuyan Channel. Shell middens are located along the Cagayan River,
from the mouth to 40 km upriver. So far more than 20 shell middens and one cave
are recognized as archaeological sites.
These
shell middens are categorized into five groups by its geological location; 1)
on the limestone hill beside the river, 50 meters above M.S.L. (Magapit, Bangag
II), 2) river bank shell middens, five to eight meters above M.S.L. (Dummon,
Gattaran Centro Sur, Aggunetan, Aguiguican, Bangag, San Lorenzo, Alaguia,
Catugan, Santa Maria, Catayauan, Tucalana, Lal-lo Centro, Dugo, Camalaniugan
Centro), 3) inland shell middens, one to two kilometers east from river bank,
seven to eight meters above M.S.L.(Bagumbayan, Dalaya, Catayauan II), 4)
limestone hill cave, four kilometers away from river bank, 40 meters above
M.S.L. (Mabangog), 5) sea shore sand dune shell middens, 0 to five meters above
M.S.L.(Aparri).
The limestone hill shell midden (Magapit
site) and riverbank shell middens (Catayauan site) are mentioned already at the
brief history of the research. Inland shell middens are so far recognized three
sites. Although the excavation of the sites is not yet performed, pottery
sherds and polished stone adzes were not collected during the site
reconnaissance survey. There is the possibility that these shell middens had
formed before the appearance of pottery in the area.
Scenery
of shell middens
The
explanation of natural settings and history of research area start from the
mouth of Cagayan River. River delta is developed on the east bank from the
mouth of river to 10 km upriver. Limestone formation stops at the boundary of
delta. It is supposed that the boundary of delta and limestone had been the
seashore before the delta developed (Ooi 1996:personal communication). The
width of river is 1.5 km at the mouth and 1.25 km at the boundary.
The
town of Camalaniugan was built at the boundary of delta and limestone
formation. The bell of Camalaniugan Church has the date of 1597(National Historical
Institute 1993). Juan de Salcedo and Don. Juan Ronquillo乫s expedition in the northern Luzon had performed since
1572. After the suppress of two times of rebellions raised in the Lower Cagayan
River, Dominicans had engaged in missionary work from 1596. The tower to keep
watch the raiders or pirates making attack from the mouth of river has been
built situated on the river bank, in Camalaniugan Centro, 200 meters north of
the church. The ruin of the Watch Tower remained as a historical marker of Spanish
time. Shell deposit extends about 500 meters long, 50 meters wide, in the town
of Camalaniugan Centro. Chinese blue and white porcelain sherds were collected
from the surface ground. Ibanag people of this town have performed shell
gathering.
Dugo
shell midden is situated on the former river bank, one kilometers south of
Camalaniugan Centro, along the west side of National Highway No. 5. Present
riverbank is formed about 500 meters east of the site. Cortez site, one of the
locations to be excavated by National Museum. The excavation indicates that the
shell deposit showed more than one meter deep (Orogo 1980).
Water
level of Cagayan River is affected by the raise and fall of sea tide. Water
control of the Coast and Geodetic Survey measures the difference of low and
high tide water level as 155 cm every six hours 42 minutes (Bureau of Coast and
Geodetic Survey 1971, 1982).
Lal-lo
Centro is located seven kilometers south upriver. The river width here becomes
narrower, but it measures about 800 meters. Alluvial plain of Lal-lo extends
two or three kilometers on the east bank, and the limestone formation
continuing from Camalaniugan to southward retreats here and comes out at
Magapit on the river bank. On the alluvial plain, paddy field extends now a
day. Shell deposit extending area is recognized as 500 meters long, 100 meters
wide and two meters deep. Stratigraphy of shell deposit is observed on the wall
of well drilled in the town.
Town
of Lal-lo had been called as Nueva Segovia, and capital of Cagayan province
until 1839. Nueva Segovia was originally built by Juan Pablo Carion in 1582
during the first era of Spanish expedition (Morga 1966丗52, 302-3, Keesing 1962:168-181). Defeating
the Chinese and Japanese pirates at the mouth of river, Carion secured the
first Spanish settlement on the lower Cagayan River. Nueva Segovia became an
administration, military, economy and religious center of present three
provinces, Cagayan, Isaberra and Nueva Viscaya. But in 1755, diocese was
transferred to Vigan, Ilocos Sur, and the capital of Cagayan also transferred
to Tuguegarao, present capital of Cagayan, in 1839乮National Historical Institute 1993:81, 124).
The economic and political importance of Nueva Segovia had lost gradually, now
it is called by its Ibanag name, Lal-lo.
Historic
documents indicate that the first settlement of Nueva Segovia built by Carion
was located at eight miles from the river mouth. Eight miles is equivalent to
13 km (Morga 1966, Keesing 1962). But at present, it measures 17 km from the
river mouth to Lal-lo. If the historic records are correct, why does generated
the four kilometers difference for 400 years. After 400 years, if the delta had
developed for four kilometers, the rate of delta development must be one
kilometer for one hundred years.
According
to the research of palynology and geology group, before the delta was formed,
limestone hill had been washed by sea tide at Camalaniugan. At the same period,
Lal-lo area of the lower Cagayan River had been swampy, and the river had
flowed slowly (Ooi 1996;personal communication, Aguilera 1996). The beginning
of the formation of delta must be caused by the faster flow of the river, and
washed away the muddy soil of swamp deposited at Lal-lo area to the sea. The
cause of the faster river flows possibly to be derived by the sea level
change.
Ecological
and geological settings of the Cagayan River affect the conditions of shell
habitat, also the formation of shell middens along the river. Shell middens of
research area are formed predominantly by one species of freshwater bivalve
shell, locally called Kabibi (possibly Batissa childreni, Toizumi 1996;personal
communication). The habitat of this species of shell is sandy riverbed, not
muddy swamp bed. Then, when the ecological settings of the area had been
swampy, Kabibi shell could not inhabit there, therefore, shell middens also could
not be formed. This assumption must be tested by the further collection of data
on geology and palynology.
Catayauan
shell midden is located four kilometers upriver from Lal-lo Centro. Shell
midden extends 500 meters long, 100 meters wide and two meters deep. About 500
families now populate Catayauan village, 2,500 population and 100 families are
Ibanag shell gatherers. Shells cover ground surface, and houses are built on
the white shell ground. Shells have been collected and discarded for long years
and huge shell midden are formed. In San Lorenzo and Catugan village in front
of Catayauan also have huge shell middens on the riverbank.
Santa
Maria shell midden is situated two kilometers upriver from Catayauan. In Santa
Maria, the formation of shell midden is different from the one of Catayauan.
Shell middens here have ten meters diameter, two meters deep and extends on the
riverbank, every 30 to 50 meters intermittently in an area of one kilometer
long. The different type of the formation of shell middens in Santa Maria and
Catayauan could be caused by the difference of shell gatherer乫s social
organization, population density or utilization of shells. But the actual
condition must be continuously studied.
At
Magapit, the width of river becomes suddenly narrower, about 400 meters, at
three kilometers upriver from Santa Maria. This is because at Magapit, the
limestone formation across the river and extends to westward, and the river cut
through the limestone formation. Magapit shell middens are situated on the east
bank of the river, in the different locations on limestone hill. Five locations
of shell middens are recognized in 800 meters of distance along the National
Highway. Hill Top site above mentioned produced big amount of artifacts and
ecofacts including red-slipped pottery sherds. The datings of Hill Top site
shows about two thousand years older than Catayauan shell midden, which
produces the black pottery.
Bangag
shell midden is located on the alluvial plain on the west bank of the river, in
front of Magapit sites. Site area extends 100 meters diameter and deepest
deposit measured 2.8 meters. The location of Bangag site is alluvial plain
deposited on the limestone bedrock, one hundred meters away from the river
shore. Bangag shell midden formed mound one or two meters higher than the level
of surrounding ground surface. Black pottery produced here has decoration of
incision, hum-like handle, but black pottery from Catayauan, Santa Maria and
San Lorenzo usually has no incision. The limited evidence of black pottery from
Catugan site is similar to the decoration of black pottery from Bangag site.
Even though among black potteries exist the different characteristics, both of
them might belong to the Metal Age pottery, comparing with other Metal Age potteries
in the Philippines.
Other
shell middens are recognized on the west bank of Cagayan River; San Lorenzo,
Catugan and Alaguia. San Lorenzo ad Catugan are located on the riverbank, and
face to Catayauan and Santa Maria on the other side of river. Stratigraphy of
shell layers is exposed on the wall of riverbank. Alaguia shell midden is
located on the tributary of Cagayan River, and exposes more than two meters of
shell deposit on the riverside. Black pottery is collected from those three
sites. San Lorenzo and Catugan sites are already excavated and revealed two
shell layers on the riverbank wall face to the Cagayan River. After having
excavated the second lower level of shell layer, red-slipped pottery sherds
were revealed in the silty clay layer from those two sites. Red-slipped pottery
sherds revealed under the shell layer are also recognized in Santa Maria and
Bangag site. The characteristic difference of red-slipped pottery between
Magapit and these sites is on the decoration; the former has dot punctuation
and incision, but the latter has no decoration except perforation on ring-foot.
But some pottery form is similar; such as Footed bowl type and Jar type
pottery. Chronological order of these two types of red-slipped pottery is still
unknown at this stage of research. But it is interesting that before shell
middens were formed on the both side of riverbank, the people living on the
both side of the river had used red-slipped pottery. At this period, the
ecological setting of the river was not good for the habitat of shells. There
had been the swampy ecological conditions as mentioned above. With the
collaboration of geological and Palynological studies, chronology and
subsistence study of the red-slipped pottery phases will be examined and
studied.
Climate
and ecological settings.
On the climate of the lower
Cagayan River, the atmospheric temperature is 29.1 degrees at highest (in May)
and 23.2 degrees at lowest (in January), and the annual average temperature is
26.7 degrees. Total amount of annual precipitation is 2,178.4 mm; it reaches at
the highest peak in November, and the lowest in April (National astronomical
observatory of Japan 1995:136-7,180-1). The width of the river at the each
shell middens mentioned above should be summarized here; Aparri, 1.5 km,
Camalaniugan, 1.25 km, Lal-lo Centro and Catayauan and Santa Maria, 800 meters,
Magapit, 400 meters and Dummon, the shell midden site of south end, 1 km. The
sand bars are formed along the lower river, and at the other side of Lal-lo Centro
big sand bar island is developed. The river activities to bring sand, stone and
silt downriver rapidly form the sand bars along the riverbank. Especially after
typhoon, sand bars are developed and emerge different shape. During more than
one decade of our research, sand bars have changed its shape little by little.
Even though thus strong river activity to bring and deposit soil, the depth of
the river keeps five to seven meters at the deepest point.
It
is supposed that the natural conditions of shell gathering ground change
annually or daily. Topography of riverbed directly affect to the habitat of
shells and fishes. Every year, from August until November, typhoon changes the
topography of the riverbed, and new fishing ground is formed. The sea tide changes
twice a day, seawater comes into the river up to Magapit. The water level
difference of low and high tide is 155 cm at Camalaniugan. The daily tidal
change affects the salinity and temperature of river water, and these changing
conditions affect also the shell and fish habitat. Shell gatherers in the
research area read everyday the changes of those natural conditions and select
the gathering point.
Shell
gatherers say that the tide comes into Magapit, 26 kilometers upriver from the
mouth. It must be caused by the gentle inclination of the river at this area,
ten meters of level difference for 40 kilometers distance. Our measurement of
salinity of the river at Catayauan village shows less than one percent, even
though shell gatherers say the salinity of river water affect to the habitat of
shells. So far, we don乫t have precise data of salinity of the river, but it
could be possible to estimate the habitat area of each shell species by the
information of shell gatherers. It indicates that the habitat of three major
species of shells Kabibi, Asisi and Ginookan (Ibanag term), is different as
showed in Figure 4 (see Fig. 4, P. 249). The habitat of Ginookan is smallest,
and Asisi can live widely in freshwater, Kabibi can be gathered from
Camalaniugan to Gattaran. Comparing the population in 1846 and 1948, total
population of Cagayan became seven times (Keesing 1962:216-7). Although eighty
percent of population in 1948 was Ilocano, Ibanag population didn乫t augment so
much. Ibanag population growth rate during 100 years is very low comparing with
the high growth rate in all region of lowland Philippines. This event was
derived from the Ilocano migration to Cagayan and they pushed Ibanag people to
the southern region of Cagayan (Keesing 1962:218-9).
Shell
gathering village population also has been augmented gradually by Ilocano
migration. At present, the population of Ilocano is bigger than Ibanag. But
Ibanag people perform the shell gathering. Ilocano usually doesn乫t perform the
shell gathering except some Ilocanos in San Lorenzo village. Although Ilocano
migration pushed Ibanag people to southern Cagayan, now population is mixed in
the villages of the lower river, even Ilocanos are majority. There must be
existed the regulation mechanism to avoid the conflict in this situation of
mixed population.
Shells
for gathering and midden formation.
Shell
middens in shell gathering village is situated on the Cagayan River bank, and
formed predominantly by one freshwater bivalve shell. Other shell species from
middens are two freshwater bivalve, three freshwater conical shell and land
snails. Characteristics of three freshwater bivalves are as follows;
Kabibi (possibly, Batisa childreni): size of Kabibi gathered varies from six
centimeters wide, five centimeters long and three centimeters high to 2.5
centimeters width, two centimeters long and one centimeter high. Wet weight of
big one with shell measures 55 grams. Shell middens explored in the lower
Cagayan River formed predominantly by Kabibi. Kabibi乫s habitat extends from
Camalaniugan to Gattaran (40 kilometers form the mouth of river), and Kabibi is
annually gathered, even there is the fluctuation of monthly catch amount.
Annual catch amount also shows the fluctuation, such as in 1986 to 87 the
amount became few, but in early 90乫s it became a lot. The factors affect the
rise and fall of biomass and the catch amount of shells are still unknown.
Kabibi gathering is a main subsistence ways of shell gatherers in the area, and
they sell most of their catch to brokers living in the village. Shell brokers
are usually women. They bring those shells bought everyday to the towns in the
lower river and sell in the markets. Shell gatherers today usually don乫t eat
shells; therefore they don乫t discard shells to form shell middens.
Asisi: Average size of Asisi measures 1.5
centimeters wide, 1.5 centimeters long and one centimeter high. This shell
species distributes in freshwater all over the Philippines. In Tagalog, it is
called tulya. Asisi can be collected big amount in one time gathering, but in
rainy season, the catch amount falls down. Shell gatherers tell that they began
to gather Asisi recently, before few decades. And the reason why they began to
gather Asisi is the shortage of Kabibi catch amount. Asisi became the substitute
of Kabibi. Excavation data of shell deposit shows that Asisi is revealed mainly
from the surface ground, but the deeper in layers, the fewer the frequency (see
Table 8, P. 263). Asisi is also gathered for cash. The amount to be consumed by
shell gatherers is also few, but shell of Asisi is discarded in the village. It
is not because that the Asisi consumption by shell gatherers, but because that
shells are removed for selling at higher price. Watching the surface ground of
shell gathering village, new shells of Asisi can be observed.
Ginookan: Average size of Ginookan measures 2.5
centimeters wide, 1.5 centimeters long and 0.8 centimeters high. Its shell is
thin. According to the shell gatherers, its habitat ranges from Lal-lo Centro
to Santa Maria (see Fig. 4, P. 249). The habitat area Ginookan can be gathered
is smaller than the one of Kabibi. Therefore its catch amount is also limited.
Quantitative data of Ginookan gathering and transaction are not yet fully
collected. But it is said that Ginookan has short life, not so strong like
Kabibi, and cannot last for two days after having been gathered. So, Ginookan
is not appropriate to sell in Markets far from this area. And sometimes it is
served for self-consumption in a household. It is sometimes processed to remove
its shell by boiling, and sold its meat. The meat processed to 乭alamang乭, a
local seasoning. Shells removed and consumed are discarded in the village.
Other
three species of freshwater conical shells乮Agurong, Liddak, Biruko) and land snails are
found from shell middens. But its amount is limited.
4. Contents of the Report.
Each
chapter of the report is written about the excavation of the site, or
scientific analyses of data collected for the different disciplines by the
researchers in charged to participate to the Lal-lo Project. Contents of each
chapter and its author are shown as follows;
Introduction:
research rationales and brief history of the project: Ogawa, Hidefumi
1. Preliminary Report on the
Palynological Study at Lal-lo Basin, Northern Luzon, Philippines: Ooi, Nobuo
2. Preliminary Report: Results of Geomorphological Field Study
conducted in the Lower Reaches of Cagayan River:
Aguilera, Melchor L., Jr.
3.
Geological and
Geomorphological Study conducted in the Lower Reaches of the Cagayan River:
Aguilera, Melchor L., Jr.
4.
Archaeological Excavation of the Shell
Midden Sites in Lal-lo, Cagayan: Ame Garong and Toizumi, Takeji
5.
Identification
of the Seasonal Grouth Pattern and Death Season of Batissa childreni: Toizumi, Takeji
6.
Preliminary
Report of the Lal-lo, Cagayan Archaeological Project: Clemente Irigayen
Property Site, Santa Maria, Lal-lo, Cagayan: Amalia De La Torre
7.
Excavation of Dombrique Site in Catugan,
Lal-lo, and Cagayan: Tanaka, Kazuhiko
8.
Excavation of Bangag Site in Bangag,
Lal-lo, Cagayan: Tanaka, Kazuhiko丂
9.
Excavation of San Lorenzo III (Siriban)
Site in San Lorenzo, Lal-lo, Cagayan: Tanaka, Kazuhiko丂
10.
Excavation of the Mabangog Cave in Sitio Mabangog, San Mariano, Lal-lo,
Cagayan: Ogawa, Hidefumi
11. Ethnoarchaeology of the Shell Middens and Shell
Gatherers in the Lower Cagayan River, Northern Luzon, Philippines-
Ogawa,
Hidefumi
12. Discussion of the topics on the Chronology
and Subsistence: Ogawa, Hidefumi
This
report is mainly on our research activities performed during the field season.
The analyses of data collected are just started. Thus the report is not fully
presented all results of research. At the next report, we will show the results
of the data analyses.
Note.
1: Two C14 dating are available in Magapit Hill Top Site:2,800亇140BP乮N-5396丆half
life:5,730擭乯, 2,760亇125BP乮N-5397, half life:5,730擭乯, one in Catayauan:1,060亇290BP(N-5398, half life:5,730擭).
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