Smithville Formation

{{Short description|Geologic formation in Arkansas, United States}}

{{Infobox rockunit

| name = Smithville Formation

| image =

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| type = Formation

| age = Ordovician

| prilithology = dolomite

| otherlithology =

| namedfor = Smithville, Lawrence County, Arkansas[http://www.dnr.mo.gov/geology/geosrv/ogc/docs/RI-073.pdf Thompson, Thomas L., 2001, Lexicon of Stratigraphic Nomenclature in Missouri, Missouri Department of Natural Resources, Division of Geology and Land Survey, Report of Investigation Number 73, p 267]

| namedby = Edward Oscar Ulrich{{cite journal |last1=McKnight |first1=E. T. |title=Zinc and lead deposits of northern Arkansas |journal=U.S. Geological Survey Bulletin |date=1935 |volume=853 |pages=311 |url=https://pubs.usgs.gov/bul/0853/report.pdf |accessdate=3 June 2018}}

| region = Arkansas

| country = United States

| coordinates =

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| subunits = Black Rock Limestone Member

| underlies = Everton Formation

| overlies = Powell Formation

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The Smithville Formation or Smithville Dolomite is a geologic formation in Arkansas. It preserves fossils dating back to the Ordovician period.