USGS Visual Identifier

National Geologic Map Database logo
GEOLEX database

Geologic Unit: Jacobsville

Publication:
Lane, A.C., and Seaman, A.E., 1907, Notes on the geological 
   section of Michigan; Part 1, The pre-Ordovician: Journal of 
   Geology, v. 15, p. 680-695.
Usage in Publication:
Jacobsville sandstone*

Modifications: Geologic Province: Dominant Lithology:
 Named
 Wisconsin arch
 Sandstone

Summary:
Named for Jacobsville, Houghton Co., northwestern MI (Upper Peninsula). Replaces Lake Superior sandstones east of Copper Range and skirting coast at intervals to Grand Island. (Freda sandstone (new) used for Lake Superior sandstones west of Copper range; Munising sandstone (new) applies to upper 250 ft of Lake Superior sandstones that crosses the bluffs near Munising, dips southward, and is white or light in color). Consists of red and brown sandstone striped with streaks of red clay shale; conglomeratic where it laps on older formations. Thickness ranges from 0 to more than 1,500 ft. Relation to Freda sandstone is undetermined; they may be the same formation. Age is Late Cambrian.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Thwaites, F.T., 1943, Stratigraphic work in northern Michigan, 
   1933-1941: Michigan Academy of Sciences, Arts and Letters 
   Papers, v. 28, p. 487-502.
Usage in Publication:
Jacobsville sandstone

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Wisconsin arch
 

Summary:
Age is not yet established, but is likely to be Upper Keweenawan [Precambrian, late Keweenawan].
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Cohee, G.V., 1945, Geology and oil and gas possibilities of 
   Trenton and Black River limestones of the Michigan basin, 
   Michigan and adjacent areas: U.S. Geological Survey Oil and 
   Gas Investigations Chart, OC-11, 1 sheet, scale 1:4,435,200
Usage in Publication:
Jacobsville sandstone*

Modifications: Geologic Province: Dominant Lithology:
 Areal limits
 Age modified
 Michigan basin
 

Summary:
Age given is Cambrian. Is present in subsurface in one well in northwestern OH. Underlies Mount Simon sandstone; overlies Precambrian rocks.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
White, W.S., Cornwall, H.R., and Swanson, R.W., 1953, Bedrock 
   geology of Ahmeek quadrangle, Michigan: U.S. Geological Survey 
   Geologic Quadrangle Map, GQ-27, 1 sheet, scale 1:24,000 [http:/
   /ngmdb.usgs.gov/Prodesc/proddesc_725.htm]
Usage in Publication:
Jacobsville sandstone*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Overview
 Wisconsin arch
 

Summary:
In Ahmeek quad, Jacobsville consists primarily of buff- or salmon-colored, fine- to coarse-grained sandstone, with subordinate amounts of reddish-brown pebble conglomerate. Sandstone contains a large proportion of well-rounded quartz grains. Outside quad area, more complete exposures show subordinate amounts of less resistant red shales and silty shales commonly interbedded with sandstone. Total thickness may be at least 1,800 ft based on drill hole a few miles south of Calumet; could be thicker. Although Lane (1911) suggested that Jacobsville could be a transitional unit linking Keweenawan with Cambrian sedimentation, later studies have shown it to represent probably the last phase of Keweenawan sedimentation and it may be of Precambrian age.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Hamblin, W.K., 1958, The Cambrian sandstones of northern Michigan: 
   Michigan Geological Survey Publication, no. 51, 146 p.
Usage in Publication:
Jacobsville formation

Modifications: Geologic Province: Dominant Lithology:
 Revised
 Age modified
 Wisconsin arch
 

Summary:
Revised as Jacobsville formation in this report. Four lithic units recognized within formation: conglomerate facies, lenticular sandstone facies, massive sandstone facies, and red siltstone facies. Thickness varies because of relief of Precambrian surface over which formation was deposited. Underlies Munising formation; in some areas, is covered by glacial drift. Along Lake Superior coast, from Munising to Beaver Lake, formation is under water. Age has been a matter of conjecture for many years; paper gives background and discusses factors favoring Keweenawan age and evidence opposing Keweenawan age. Unconformity between Jacobsville and Munising formations exposed at Grand Island proves that Jacobsville is older than Upper Cambrian, but it is impossible to estimate magnitude of unconformity and state whether Jacobsville is Lower and Middle Cambrian or Upper Keweenawan. Jacobsville represents continental sediments deposited in an enclosed basin during the same time as marine sediments of Lower and Middle Cambrian age were being deposited in other parts of the country.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Hamblin, W.K., 1961, Paleogeographic evolution of the Lake 
   Superior region from Late Keweenawan to Late Cambrian time: 
   Geological Society of America Bulletin, v. 72, no. 1, p. 
   1-18.
Usage in Publication:
Jacobsville sandstone

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Wisconsin arch
 

Summary:
Age revised as Cambrian or Precambrian(?).
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Eddy, G.E., 1964, Stratigraphic succession in Michigan, Paleozoic 
   through Recent: Michigan Geological Survey Chart, no. 1, 1 
   sheet.
Usage in Publication:
Jacobsville Sandstone

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Wisconsin arch
 

Summary:
Age on chart shown as Early Cambrian.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Books, K.G., White, W.S., and Beck, M.E., 1966, Magnetization 
   of Keweenawan gabbro in northern Wisconsin and its relation 
   to time of intrusion, IN Geological Survey research 1966: 
   U.S. Geological Survey Professional Paper, 550-D, p. 
   117-124.
Usage in Publication:
Jacobsville Sandstone*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Wisconsin arch
 

Summary:
Geologic map (fig. 1) shows Jacobsville Sandstone as Upper Keweenawan.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Gair, J.E., and Thaden, R.E., 1968, Geology of the Marquette 
   and Sands quadrangles Marquette County, Michigan: U.S. 
   Geological Survey Professional Paper, 397, 77 p. [Available 
   online from the USGS PubsWarehouse:  http://pubs.er.usgs.gov/
   pubs/pp/pp397]
Usage in Publication:
Jacobsville Sandstone*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Wisconsin arch
 

Summary:
Although earlier workers thought Jacobsville to be of Keweenawan age, authors of this report follow Hamblin (1958) who believed that Jacobsville represented continental deposition during Early and Middle Cambrian time.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Fritts, C.E., 1969, Bedrock geologic map of the Marenisco-Watersmeet 
   area, Gogebic and Ontonagon Counties, Michigan: U.S. Geological 
   Survey Miscellaneous Investigations Series Map, I-576, 5 p., 
   1 sheet, scale 1:48,000
Usage in Publication:
Jacobsville Sandstone*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Wisconsin arch
 

Summary:
Jacobsville Sandstone shown as Upper Precambrian.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Sims, P.K., and Peterman, Z.E., 1976, Geology and Rb-Sr ages of 
   reactivated Precambrian gneisses and granite in the 
   Marenisco-Watersmeet area, nrothern Michigan: U.S. Geological 
   Survey Journal of Research, v. 4, no. 4, p. 405-414.
Usage in Publication:
Jacobsville Sandstone*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Wisconsin arch
 

Summary:
Jacobsville Sandstone shown as Precambrian Y in age.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Sims, P.K., 1976, Early Precambrian tectonic-igneous evolution 
   in the Vermilion district, northeastern Minnesota: Geological 
   Society of America Bulletin, v. 87, no. 3, p. 379-389.
Usage in Publication:
Jacobsville Sandstone*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Wisconsin arch
 

Summary:
Jacobsville Sandstone shown as Precambrian Y in age.


Publication:
Mudrey, M.G., Jr., and Ostrom, M.E., 1986, Upper Keweenawan 
   stratigraphy, Chapter IV, IN Mudrey, M.G., Jr., ed., Precambrian 
   petroleum potential, Wisconsin and Michigan: Wisconsin 
   Geological and Natural History Survey, Geoscience Wisconsin, 
   v. 11, p. 23-25.
Usage in Publication:
Jacobsville Formation, Sandstone

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Wisconsin arch
 

Summary:
Shown as Middle Proterozoic age and is assigned to upper Keweenawan. Overlies middle Keweenawan volcanics. Correlated with Bayfield Group in WI (differs in its heavy mineral composition).
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Cannon, W.F., 1986, Bedrock geologic map of the Iron River 1 
   degrees by 2 degrees quadrangle, Michigan and Wisconsin: U.S. 
   Geological Survey Miscellaneous Investigations Series Map, 
   I-1360-B, 1 sheet, scale 1:250,000 [http://ngmdb.usgs.gov/
   Prodesc/proddesc_9158.htm]
Usage in Publication:
Jacobsville Sandstone*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Revised
 Wisconsin arch
 

Summary:
Age of Jacobsville Sandstone is Proterozoic Y, although correlation chart shows uncertainty as to how old or young the unit is. Assigned to Keweenawan Supergroup and is classified as Middle Keweenawan.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Cannon, W.F., Woodruff, L.G., Nicholson, S.W., and Hedgman, 
   C.A., 1996, Bedrock geologic map of the Ashland and northern 
   part of the Ironwood 30' x 60' quadrangles, Wisconsin and 
   Michigan: U.S. Geological Survey Miscellaneous Investigations 
   Series Map, I-2566, 1 sheet, scale 1:100,000 [http://
   ngmdb.usgs.gov/Prodesc/proddesc_13052.htm]
Usage in Publication:
Jacobsville Sandstone*

Modifications: Geologic Province: Dominant Lithology:
 Areal limits
 Wisconsin arch
 

Summary:
Jacobsville Sandstone extended from MI into WI in the area Iron Co.
Source: GNU records (USGS DDS-6; Reston GNULEX).