Diplomystus Knightia from the Green River Formation in Wyoming
The Green River Formation is an Eocene geologic formation that records the sedimentation in a group of intermountain lakes in three basins along the present-dayGreen River in Colorado, Wyoming, and Utah. The sediments are deposited in very fine layers, a dark layer during the growing season and a light-hue inorganic layer in the dry season. Each pair of layers is called a varve and represents one year. 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 thickness of 0.014 mm and maximum of 9.8 mm.
- an area in northwestern Colorado east of the Uintas
- a larger area in the southwest corner of Wyoming just north of the Uintas known as Lake Gosiute
- the largest area, in northeastern Utah and western Colorado south of the Uintas, known as Lake Uinta
In Australia 360 Million Years Ago
The Devonian Inland rivers and lakes teemed with fish.Tthe invasion of dry land had begun, but the majority of life was still underwater. Life looked very different and this is the time when our fossils were alive
Read more from The Age of Fishes Museum in Canowindra NSW.