The sediments of the Green River Formation present a continuous record of six million years. The mean thickness of a varve here is 0.18 mm, with a minimum ... Lithology and formation · Fossil zones · Oil shale

They concluded that the transition occurred between 49.7 and 50.7 million years ago and lasted less than half a million years (Clyde, W.C. et al, 1995). To ...

…the United States, is the Green River Formation of Utah, Wyoming, and Colorado of Eocene age (i.e., formed 57.8 to 36.6 million years ago). This vast deposit ...

4 апр. 2024 г. · Is younger than Wasatch formation and older than Bridger formation. Of middle Eocene age. Geologic map. Cross section. Columnar sections. Source ...

These avian specimens offer an unparalleled window into an entire ecosystem frozen in time, granting us a rare glimpse into life over 50 million years ago ...

19 июл. 2024 г. · It was deposited in a group of lakes in Wyoming, Colorado and Utah during the tropical middle the Eocene Epoch, about 50 million years ago. The ...

These large lakes persisted for around 12 million years—longer than most known lake systems on Earth!

Green River Formation Fifty million years ago, this was a lush, sub-tropical area, very different from the high desert climate found in much of the area today. ...

The various fossil beds of the Green River Formation span a five million year period, between 53.5 and 48.5 million years ago (mya). During this period the ...