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National Geologic Map Database

Geologic Unit: Tonoloway

Usage:

Tonoloway Formation (PA*,VA,WV)
Tonoloway Limestone (MD*,VA*,WV*)
/Tonoloway Limestone of [†]Cayuga Group (MD*,PA*,VA*,WV*)
/Tonoloway Formation of [†]Cayuga Group (VA)

[†Cayuga, at its type locality, has been abandoned as a lithostratigraphic term, and has been used as a chronostratigraphic term (Cayugan Stage) for some time. To prevent confusion, the use of Cayuga as a lithostratigraphic term should be avoided.]


Geologic age:

Late Silurian*


Type section, locality, area and/or origin of name:

Exposures on east flank of Tonoloway Ridge, along Cacapon near Rock Ford, Morgan Co., WV (Ulrich, 1911).
[US geologic names lexicon, USGS Bull. 896, states the naming feature is located in Washington Co., MD.]


AAPG geologic province:

Appalachian basin*


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 ([ ]).