Fossils of plants, invertebrates, and vertebrates are abundant in rocks
exposed in the Fossil Basin. For example, Oyster Ridge received its name
because of the well-preserved and abundant fossil oysters found there.
Of course, Fossil Butte and Fossil Butte National Monument were so named
because of the beautifully preserved fossil fish. A brief review of the
main groups of fossils to be found in the basin follows.