Oldest Fusulinid of Khao Khad Formation, Saraburi Province
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Abstract
The study area is located at Khao Makok, in Khao Khad Formation, Saraburi province. It consists of limestone with a lot of fossils such as fusulinid, crinoid, coral, bivalves, etc. These collected limestone samples were prepared as thin sections for petrographic study. The fusulinid is an index fossil used to indicate the age in Carboniferous - Permian. Most of fusulinids in previous studies determined middle Middle Permian - late Middle Permian. However, Robustoscwagerina in this study determined Early Permian (Sakmarian-akhtashian). It is the oldest fusulinid of Khao Khad Formation representing that Khao Khad Formation was developed in Early Permian. In petrographic study, the rock is bioclastic rudstone. The most bioclastic grains are fusulinids that show high diversity. It indicates that the study area was deposited in outer shelf environment.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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