Wyoming (US)

Main article: United States

Education

2023: Literacy rate of the population - 91.1%

Data for 2023

History

1965

Wyoming Lift Safety Standards, 1965.

1885

Main article: Transportation in the United States

Union Pacific Railway locomotive crosses Dale Creek, 1885, Wyoming, USA

400 million hp: Fossil bony fish in the Green River Formation

Main article: The history of the Earth before the appearance of hominids

Bony fish. At a junction called Fossil, near Kemmerer (Wyoming, USA), cliffs of marl limestones and clay shales are exposed. These are deposits of Eocene age that accumulated in one of the numerous lakes that extended into southwestern Wyoming and neighboring states of Utah and Colorado. These deposits are part of the Green River Formation. They are famous for the perfectly preserved fossil fish found in them in large numbers.

The group of fish to which the finds belong in the Green River Formation had the same skin structure as in sharks, but the inner skeleton of these fish has changed. Their complex inner skeleton was not built from cartilage, but from real bones, and more skin bones were added to the skull, jaws and shoulder girdle. Their caudal fins changed, and in more advanced shapes the tail took on a bilaterally symmetrical shape. After the Devonian extinction, when placoderms died out, bony and cartilaginous fish began to dominate the seas, having no competitors.