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Newport Quarry (Thompson-McCully quarry), Newport, Monroe Co., Michigan, USA

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Latitude & Longitude (WGS84): 42° 0' 8'' North , 83° 18' 31'' West
Latitude & Longitude (decimal): 42.0022222222, -83.3086111111

An abandoned quarry.

Mineral List

Regional Geology

Silurian-Devonian358.9 - 443.8 MaSilurian-Devonian sedimentary rocks

Sedimentary rocks

Pridoli - Ludlow419.2 - 427.4 MaBass Island Dolomite

Major:: {dolomite},Minor:: {shale},Incidental:: {limestone, sandstone}

Bass Island Dolomite

Secondary unit description from USGS Geologic Names lexicon (ref. MI016): Named Bass Islands series. Unit disconformably underlies the Sylvania sandstone and overlies the Salina. The Bass Islands includes (descending) the Raisin River dolomite (200 feet), the Put-in-Bay dolomites (100 feet), Greenfield dolomite (100 feet), and the Tymochtee shales and limestones (100 feet), which may represent in part one or more members recognized elsewhere. Age is Silurian. Named from group of islands in western Lake Erie.

Silurian419.2 - 443.8 MaSilurian sedimentary


References for regional geology:

Data provided by

Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .

USGS compilers. State geologic map data. State Maps.

Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.

6 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Rocks & Minerals: 58:108.

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