Bayan Shireh Formation, Late Cretaceous geological formation in eastern Gobi Desert, Mongolia.
The Bayan Shireh Formation contains layers of grey mudstones and yellowish-brown sandstones reaching depths of 300 meters beneath the Mongolian surface.
Scientists first documented this formation in 1959, dating its sediments between 102 and 86 million years ago during the Late Cretaceous period.
Researchers from multiple countries conduct expeditions to study the formation's diverse fossil collection, which includes therizinosaurs, turtles, and hadrosauroids.
The formation divides into upper and lower sections, each containing distinct rock compositions that provide different insights into ancient environmental conditions.
Fossil discoveries within the formation reveal evidence of large water bodies and semi-arid conditions that existed in Mongolia during the Cretaceous period.
GPS coordinates: 44.27033,109.91351
Latest update: March 6, 2025 01:02
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