Gasport Formation

{{Infobox rockunit

| name = Gasport Formation

| image =

| caption =

| type = Formation

| age = Sheinwoodian
~{{Fossil range|433-432}}

| prilithology =Limestone, Dolomite

| otherlithology =Chert

| namedfor =Gasport, New York

| namedby =Brett C.E.

| region = New York, Ohio, Pennsylvania, West Virginia, Ontario

| country = United States, Canada

| coordinates =

| unitof =Lockport Group

| subunits =*Pekin Member

• Gothic Hill Member

| underlies =Goat Island Formation

| overlies =Clinton Group

| thickness =

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| area =

| map =

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|period=Silurian}}

The Gasport Formation is a geologic formation in the Appalachian Basin and Michigan Basin.[https://ngmdb.usgs.gov/Geolex/Units/Gasport_1768.html Gasport], USGS, National Geologic Map Database, Geolex — Unit Summary This is one of the reef formations separating the Appalachian Basin from the Michigan Basin and the Ohio Basin. It is a part of the Lockport Group of carbonates. It is the lowest and oldest formation within the Lockport. The Gasport is found in Michigan, New York, Ohio, and Pennsylvania. Outcrops are limited to the area around the Great Lakes. It is part of a large reef structure dating back to the Silurian period. Being part of the Lockport Group it is a feature of the Niagara Escarpment.{{Cite web |date=2010-06-04 |title=The Niagara Escarpment |url=http://www.uwgb.edu/dutchs/GeologyWisconsin/niagesc.htm |access-date=2023-09-13 |archive-url=https://web.archive.org/web/20100604132605/http://www.uwgb.edu/dutchs/GeologyWisconsin/niagesc.htm |archive-date=2010-06-04 }}