The Eau Claire Formation is a

geologic formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...

in the north central United States. It preserves

trilobite Trilobites (; meaning "three-lobed entities") are extinction, extinct marine arthropods that form the class (biology), class Trilobita. One of the earliest groups of arthropods to appear in the fossil record, trilobites were among the most succ ...

fossils A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

from the

Cambrian Period The Cambrian ( ) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovici ...

References

Sources

* * Cambrian United States Dolomite formations of the United States Cambrian Kentucky Cambrian Illinois Cambrian Indiana Cambrian Michigan Cambrian Ohio Cambrian geology of Wisconsin Cambrian System of North America Cambrian southern paleotemperate deposits Cambrian southern paleotropical deposits Sandstone formations of the United States Siltstone formations of the United States Shale formations of the United States {{US-geologic-formation-stub

See also

References

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