Abstract
“Phu Sung”, a new fossil site in Sakon Nakhon Province was recently reported. Phu Sung fossils are very complete and in very well-preserved condition. They were found in reddish micaceous silty mudstone. The stratigraphy and sedimentology show that Phu Sung succession is a continental deposit in the fluvial system and it is in the Early Cretaceous Sao Khua Formation of the Khorat Group. According to lithology, fossils were deposited in a quiet environment, such as overbank deposit, small pond or oxbow lake margin. Sedimentary structures such as desiccation crack and calcrete indicate semi-arid to arid paleoclimate condition which probably corresponds to the taphonomy or preservation of the fossils.
Highlights
The Khorat Group is the Mesozoic non-marine deposit
The stratigraphy and sedimentology show that Phu Sung succession is a continental deposit in the fluvial system and it is in the Early Cretaceous Sao Khua Formation of the Khorat Group
The Lower Cretaceous Sao Khua Formation of the Khorat Group is well exposed in northeastern Thailand (Figure 1) and has yielded various vertebrate remains
Summary
The Khorat Group is the Mesozoic non-marine deposit. It is dominated by reddish classic sedimentary rocks including mudstone, siltstone, sandstone and conglomerate [1]. The Lower Cretaceous Sao Khua Formation of the Khorat Group is well exposed in northeastern Thailand (Figure 1) and has yielded various vertebrate remains. Stratigraphy and palynology indicate that the Sao Khua Formation is Early Cretaceous in age (Barremian) [2] [3]. Vertebrate fossil sites in Sakon Nakon were previously revealed, most of the fossils such as fresh water shark, bony fish, turtles, crocodiles, pterosaurs, dinosaurs and lizard eggs were fragmentary. A new vertebrate fossil site “Phu Sung” with a good fossil preservation was found near Muang Sakon Nakhon District, Sakon Nakhon Province (Figure 1). We are interested in the sedimentology and stratigraphy of the site to interpret the paleoenvironment of the Phu Sung fossil site
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