LOCATION : Exploring Goseong Dinosaurs > Introduction of Goseong Dinosaurs > Paleoenvironmental Goseong

Paleoenvironmental Goseong

TThe dinosaur was a land animal of the Mesozoic Era. So, we need to find the sedimentary rock, which had piled up during the dinosaur’s period, to find the fossil of dinosaur. In the Mesozoic sedimentary rock of the Korean peninsula it is not possible to find the sea sedimentary rock but the land sedimentary rock can be found. Even though there is sedimentary rock of the Triassic and Jurassic period in the Korean peninsula, the vestige of dinosaurs was found only in the cretaceous. The fossils of dinosaurs which lived around the big lake formed in the Gyeongsang basin which includes the current Gyeongsannambukdo has remained. This cretaceous stratum is called the ‘Gyeongsang layer’, which stands for the Mesozoic era of Korea.

Most of the fossils of dinosaurs and their footprints, which have been reported, have been found in this Gyeongsang layer.
The majority of stratum which are spread in Goseong are shock formation, which is the top part of haying group of the Gyeongsang layer. An era of this stratum is the latter period of the cretaceous, 100 million years ago. Shock formation shows granule sandstone or siltstone and clay rock alternately, is black and has heat transmutation.  The fossils of dinosaur footprints and bird footprints in Goseong and the most of the sedimentary structure have been found in this shock formation. When looking at the evidence of the fossils and sedimentary structure, it is thought that the Goseong area would have been gently-sloped with a plain consisting of mud in the period which shock formation was formed. It is also thought that Goseong would have been warm like the tropics or subtropics, and the drought and monsoon would have been repeated. Due to the seasonal characteristics of this climate, it can be presumed that the level of the lake had changed frequently.

The continuous change of the lake level made it possible for deposits to pile up easily and for more dinosaur footprints to remain. Due to the volcanic activity which started at this time, dinosaurs would begin to move to safer areas. When dinosaurs moved, they had chosen the easy way along the lake rather than the way through the forest and consequently lots of the fossils of dinosaur footprints have been found in Goseong which was located at the edge of the lake. There are approximately 4300 dinosaur footprints and their sizes are various. Also the vestige of the dinoturbation which was caused by so many dinosaurs which stepped on the deposits has appeared. In this point of view, it is presumed that various dinosaurs had inhabited Goseong 100 million years ago and had been active in a group.