Research articles
ScienceAsia 51 (2023): 1-10 |doi:
10.2306/scienceasia1513-1874.2023.062
Snail diversity and paleoenvironment of the 12-meter-thick
freshwater gastropod bed, Middle Miocene, Mae Moh Basin,
Thailand
Nattawadee Nantarata,c, Schradh Saentonb,c, Yupa Thasodb,*
ABSTRACT: The purpose of this study is to investigate snail fossils collected from a 12-m-thick freshwater gastropod
bed of the Middle Miocene in the Mae Moh Basin, Northern Thailand, in order to investigate gastropod diversity, pale
oecology, and paleoenvironment using stable isotope data. Gastropod individuals of 7,532 were analyzed, representing
3 families of freshwater snails (Viviparidae, Bithyniidae, and Planorbidae), indicating freshwater paleoenvironments
such as ponds or lakes with intermittent river influx. Bellamya is the most dominant genus (62.75%), followed by
Bithynia (28.92%), Idiopoma (7.08%), Cipangopaludina (0.76%), and Mekongia (0.50%), respectively. The stable
isotopic analysis of Bellamya shells revealed ?13C values ranging from 2.10 to 5.54 and ?18O values from ?2.99
to ?6.89 . Thepositive?13Cvaluescouldresultfromdissolvedinorganiccarbonuptakefromthedissolutionofmarine
limestone surrounding the Mae Moh paleo-lake. The ?18O values confirm that the gastropods inhabited a freshwater
environment in a humid climate. The findings provide valuable insights into the Middle Miocene thick gastropod
deposition.
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| a |
Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand |
| b |
Department of Geological Sciences, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand |
| c |
Environmental Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand |
* Corresponding author, E-mail: yupa.t@cmu.ac.th
Received 25 Jun 2024, Accepted 0 0000
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