- Usage in publication:
-
- McKenzie formation*
- Modifications:
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- Original reference
- Dominant lithology:
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- Shale
- AAPG geologic province:
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- Appalachian basin
Summary:
Named McKenzie formation for McKenzie Station on the Baltimore and Ohio Railroad, Alleghany Co., MD. Unit is basal formation of Cayugan series in PA, MD, and VA. It unconformably underlies Bloomsburg sandstone and unconformably overlies Clinton group. The Kiefer [Keefer] sandstone is found to pass into the McKenzie and is therefore considered the basal member of the McKenzie formation. The McKenzie is of Silurian age.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- McKenzie Formation*
- Modifications:
-
- Biostratigraphic dating
- AAPG geologic province:
-
- Appalachian basin
Summary:
Conodont biostratigraphy indicates that the McKenzie Formation in the Winchester 30 X 60 minute quadrangle is of Late Silurian (middle Ludlovian) age. Conodonts were recovered from the P. SILURICUS Zone.
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 ([ ]).