CHANGES IN GEOMORPHOLOGY IN THE LOWER CENTRAL PLAIN OF THAOLAND CAUSED BY THE LATE HOLOCENE MARINE REGRESSION

Authors

  • Siriprapa Tepwimolpethkul นักศึกษาระดับปริญญาดุษฎีบัณฑิต สาขาโบราณคดีสมัยประวัติศาสตร์ ภาควิชาโบราณคดี มหาวิทยาลัยศิลปากร02

Keywords:

ที่ราบภาคกลางตอนล่าง, สภาพภูมิศาสตร์, การถอยร่นของระดับนํ้าทะเล, สมัยโฮโล ซีนตอนปลาย, การเรืองแสงความร้อน

Abstract

This study is aimed to understand the process of geomorphological changes of lower Central Plain of Thailand during the marine regression in the Late Holocene, especially in the areas which are located higher than the recent mean sea-level between 2 and 4 meters. Ten sedimentary sequences, approximately of 2 to 4 meter-long, were collected for sedimentary study and dating by the thermo luminescence method (TL). The result show that the sequences are homogenous, mainly consisting 2 layer: the lower one is characterized by brackish/marine clays and the upper one is freshwater floodplain sediments. TL dates show that the studied sedimentary sequences provide ages ranging from 2200-1200 BP, more or less contemporary with the contemporary with the Dvaravati Culture. The result suggest that the Lower Central Plain has been reached by the shallow sea between 1800-1500 BP in the areas which are higher than the recent mean sea-level between 2 and 4 meters in the western side and between 2-2.5 meters in the eastern side. However, the marine regression process during 1600-1200 BP caused the large freshwater in put into most part of the plain, and the position of palaeo-shoreline has been change downward to somewhere in the area southward Samphran District in Nakhon Pathom and Lamluka District in Pathum Thani

References

ผ่องศรี วนาสิน และทิวา ศุภจรรยา. เมืองโบราณบริเวณชายฝั่งทะเลเดิมที่ราบภาคกลางประเทศไทย: การศึกษาตําแหน่งที่ตั้งและภูมิศาสตร์. กรุงเทพฯ: จุฬาลงกรณ์มหาวิทยาลัย, 2524.

Sin Sinsakul. “Evidence of Quaternary Sea Level Changes in the Coastal Areas of Thailand”. A Review, Journal of Southeast Asian Earth Sciences, 1992.

Sin Sinsakul. “Late Quaternary Geology of the Lower Central Plain, Thailand.” Journal of Asian Earth Sciences 18, 2000.

Somboon Jarupongsakul. “Palynological study of the recent marine sediment of the Gulf of Thailand.” Journal of Southeast Asian Earth Science 4, 1990.

White, J.C. Penny, DKealhofer, L. and Maloney, B.. Vegetation Changes from the late Pleistocene through the Holocene from three areas of archaeological significance in Thailand. Quaternary International, 2004.

Wickanet Songtham, Watanasak M., Insai P.. “Holocene Marine Crabs and Further Evidence of a Sea-level Peak at 6,000 year BP in Thailand.” In: Proceedings of the Thai-Japanese Geological Meeting-The Comprehensive Assessments on Impacts of Sea-Level Rise, Department of Mineral and Resources, Thailand, 2000.

Umitsu M., et al. The Symposium on Geology of Thailand. 26-31 August, 2002, Bangkok, Thailand, 2002.

Downloads