The Walnut Formation is a
geologic formation from the
Albian Stage stretching from central
Texas to southern
Oklahoma
Oklahoma (; Choctaw language, Choctaw: ; chr, ᎣᎧᎳᎰᎹ, ''Okalahoma'' ) is a U.S. state, state in the South Central United States, South Central region of the United States, bordered by Texas on the south and west, Kansas on the nor ...
. It is part of the
Fredericksburg Group. The formation 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 in ...
dating back to the
Cretaceous period, notably marine
invertebrates ''Exogyra texana'', ''Gryphaea marcoui'', and ''Carseyella walnutensis''.
[Milton, W. B. (1928). The Walnut Formation of Central Texas (Publication or Document No.) aster's thesis, University of Texas Texas Scholar Works.]
See also
*
List of fossiliferous stratigraphic units in Texas
*
Paleontology in Texas
References
*
Cretaceous geology of Texas
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