Horse Spring Formation
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The Horse Spring 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
Nevada Nevada ( ; ) is a landlocked state in the Western United States. It borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the seventh-most extensive, th ...
. It preserves
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 ...
dating back to the
Neogene The Neogene ( ,) is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period million years ago ( Mya) to the beginning of the present Quaternary Period million years ago. It is the second period of th ...
period Period may refer to: Common uses * Period (punctuation) * Era, a length or span of time *Menstruation, commonly referred to as a "period" Arts, entertainment, and media * Period (music), a concept in musical composition * Periodic sentence (o ...
. The lower unit is conglomerate and the middle and upper are sandstone and freshwater limestone.


See also

* List of fossiliferous stratigraphic units in Nevada *
Paleontology in Nevada Paleontology in Nevada refers to paleontological research occurring within or conducted by people from the United States, U.S. state of Nevada. Nevada has a rich fossil Fossil record, record of plants and animal life spanning the past 650 million ...


References

Neogene geology of Nevada Conglomerate formations of the United States Sandstone formations of the United States Limestone formations of the United States Geologic formations of Nevada {{Neogene-stub