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National Geologic Map Database
Geologic Unit: Tyler
Map showing publication footprint
  • Usage in publication:
    • Tyler slate*
  • Modifications:
    • Named
  • Dominant lithology:
    • Slate
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Van Hise, C.R., 1901, The iron ore deposits of the Lake Superior region: U.S. Geological Survey Annual Report, 21, pt. 3, p. 305-434.


Summary:

Tyler slate designated upper slate formation of Upper Huronian in Penokee-Gogebic district. Named for exposures on Tylers Fork. Overlies Ironwood formation and unconformably underlies the great basal gabbro of the Keweenawan. [Thickness in later reports given as 7,000 to >11,000 ft.]

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


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

Asterisk (*) indicates published by U.S. Geological Survey authors.

"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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