U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Cabots Head beds
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
    • Limestone
    • Sandstone
  • AAPG geologic province:
    • Appalachian basin
Publication:

Grabau, A.W., 1913, Early Paleozoic delta deposits of North America: Geological Society of America Bulletin, v. 24, p. 399-528.


Summary:

Named for exposures at Cabots Head, Manitoulin Islands, Ontario, Canada. Consists of green, calcareous to argillaceous shales and thin-bedded limestones underlain by 100 to 150 feet of red shale and some sandstone. Thickness at Niagara is about 125 feet. Believed to be westward extension of Medina sedimentation. Overlies Koppel dolomite. Age is Early Silurian.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Cabot Head shale member*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Michigan basin
Publication:

Cohee, G.V., 1948, Thickness and lithology of Upper Ordovician and Lower and Middle Silurian rocks in the Michigan basin: U.S. Geological Survey Oil and Gas Investigations Chart, OC-33, scale 1:5,068,800


Summary:

Cabot Head shale member of Cataract formation extended into lower Michigan peninsula. Remains Cabot Head shale in southwestern Ontario.

Source: GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).