The Oceans And Lakes of the Paleogene
In the oceans, fish species branched out. Sharks became more plentiful. Trout and bass evolved along with many other fresh water species of fish. Huge lakes formed in the western United States during the Eocene Epoch. The Green River Formation is a famous fossil rich area created by these lakes. Many kinds of fossil fish are found in this rock formation today.
Mammals developed in the oceans, too. Primitive whales, one of the largest mammals, began to develop at this time.
In the oceans, fish species branched out. Sharks became more plentiful. Trout and bass evolved along with many other fresh water species of fish. Huge lakes formed in the western United States during the Eocene Epoch. The Green River Formation is a famous fossil rich area created by these lakes. Many kinds of fossil fish are found in this rock formation today.
Mammals developed in the oceans, too. Primitive whales, one of the largest mammals, began to develop at this time.
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