Remnant of the Late Holocene sand beach reveals ancient settlement-related sea level change from western Thailand
Issued Date
2024-08-01
Resource Type
eISSN
26827549
Scopus ID
2-s2.0-85202775022
Journal Title
Warta Geologi
Volume
50
Issue
2
Start Page
53
End Page
61
Rights Holder(s)
SCOPUS
Bibliographic Citation
Warta Geologi Vol.50 No.2 (2024) , 53-61
Suggested Citation
Nimnate P., Suriyan S., Wongcharoen S. Remnant of the Late Holocene sand beach reveals ancient settlement-related sea level change from western Thailand. Warta Geologi Vol.50 No.2 (2024) , 53-61. 61. doi:10.7186/wg502202401 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/101106
Title
Remnant of the Late Holocene sand beach reveals ancient settlement-related sea level change from western Thailand
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Author's Affiliation
Corresponding Author(s)
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Abstract
Archaeological findings and analysis of the sand beach at the Ban Khu Bua site in western Thailand indicate substantial sea-level shifts, which relate to sea-level regression during the late Holocene. This research focused on analyzing the paleo-shoreline and determining the age of ancient sandy beach deposits. Satellite imagery (Sentinel-2A) taken in 2021 facilitated classification of the paleo-coastal landforms into four main categories: colluvium, recent floodplain, old tidal flat, and old sandy beach. The latter, running predominantly north to south, is composed of fine to very fine sand characterized by sub-angular to round shapes, high sphericity, and well sorted. The sediment’s mineral composition is primarily quartz, accompanied by smaller rock fragments, organic matter, heavy minerals, and feldspars. Optically Stimulated Luminescence analysis of quartz-rich samples from the inner and outer areas suggested deposition of the old sandy beach sediments between 1,500 and 3,000 years ago in the inner part, pre-dating the establishment of the Khu Bua community in the Dvaravati period. Continuous beach sand deposition along Thao U-Thong Road aligns with the community settlement approximately 200 to 1,000 years ago.