Langston Formation

{{Short description|Geologic formation in Idaho and Utah}}

{{Infobox rockunit

| name = Langston Formation

| image = Kochina sp., Middle Cambrian, Langston Formation, Wellsville Mountains, Box Elder County, Utah, USA - Houston Museum of Natural Science - DSC01417.JPG

| caption = Fossils from the Langston Formation, Wellsville Mountains, Utah

| type = Formation

| age = Cambrian

| period = Cambrian

| prilithology =

| otherlithology =

| namedfor = Langston Creek

| namedby = Charles Doolittle Walcott

| region = Idaho, Utah

| country = United States

| coordinates =

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| subunits =

| underlies = Ute Formation

| overlies = Brigham Formation

| thickness = 30 - 498'

| extent =

| area =

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}}

The Langston Formation is a geologic formation in Idaho and Utah. It preserves fossils dating back to the Cambrian period. The formation is composed of bluish-gray limestone,Walcott, Charles. [https://en.wikisource.org/wiki/Cambrian_Geology_and_Paleontology/Volume_1/Nomenclature_of_Some_Cambrian_Cordilleran_Formations Nomenclature of Some Cambrian Cordilleran formations]. Cambrian Geology and Paleontology, I. Smithsonian Miscellaneous Collections, 53:1–12, pg. 8 weathering to a buff color, often with rounded edges.Mansfield, George Rogers. [https://books.google.com/books?id=937lAAAAMAAJ Geography, Geology, and Mineral Resources of Part of Southeastern Idaho]. U.S. Government Printing Office, 1927, p. 53.

Blacksmith Fork is the type locality, and includes more fossils than the Idaho sections.

The Langston Formation includes the fossilerous Spence Shale.