AMS <14>^C age of Cagayan shell-midden sites, Northern Luzon, Philippines


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  • フィリピン・カガヤン河貝塚群出土遺物の AMS<14>^C年代

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The lower Cagayan basin has more than 30 shell-middens. On river terrace, two cultural layers are recognized; the upper one is shell midden and the lower one is silt layer. The shell middens produce the black pottery, and the silt layers produce the red pottery. It is thought that Black Pottery Phase belongs to Iron Age, and Red Pottery Phase belongs to Pre-metal Age. The AMS ^<14>C age was obtained using four human bone samples (from Catugan and St. Maria, and two samples from Catayauan), eight animal bones from Catayauan and six charcoal samples from St. Maria. Bone samples were belonging to the Black Pottery II Phase. Charcoal samples from St. Maria were divided into two phases. Two samples were collected from shell layer (the BLack Pottery II Phase) and four samples were from silt layer (the Red Pottery II Phase). The results of dating summarizes as following, (1) Calibrated years range for four human bone samples, from Catugan, Catayauan and St. Maria were belonging to the Black II Pottery Phase from 1900 cal BP. (2) Calibrated year range for eight animal bone samples from Catayauan was from 1190 cal BP to 960 cal BP. At Catayauan, shell layer was made since about 1200 cal BP, and grew about 150cm for about 250 years. (3) Consequently the Black Pottery II Phase at St. Maria was dated allowed from 1420 cal BP to 1300 cal BP. The Red Pottery II Phase was from 3450 cal BP to 2970 cal BP. And human bone from burial pit between two phases (accompanied with Black Pottery II) was dated from 1560 cal BP to 1490 cal BP.


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