Jacobsville Sandstone (MIYj;0)

Red, brown, and white quartzose sandstone, and minor siltstone, shale and conglomerate

State	Michigan
Name	Jacobsville Sandstone
Geologic age	Middle Proterozoic
Lithologic constituents	Major Sedimentary > Clastic > Sandstone (Bed)Red, brown, and white quartzose sandstone, and minor siltstone, shale and conglomerate Minor Sedimentary > Clastic > SiltstoneRed, brown, and white quartzose sandstone, and minor siltstone, shale and conglomerate Sedimentary > Clastic > Mudstone > ShaleRed, brown, and white quartzose sandstone, and minor siltstone, shale and conglomerate Sedimentary > Clastic > ConglomerateRed, brown, and white quartzose sandstone, and minor siltstone, shale and conglomerate
References	Sims, P.K., 1992, Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan: U.S. Geological Survey Miscellaneous Investigations Map I-2185, scale 1:500,000. https://pubs.er.usgs.gov/publication/i2185
NGMDB product	NGMDB product page for 10177 NGMDB product page for 71888 NGMDB product page for 71887
Counties	Alger - Baraga - Chippewa - Gogebic - Houghton - Keweenaw - Luce - Marquette - Ontonagon