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- Usage in publication:
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- Hallowell member
- Modifications:
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- Original reference
- Dominant lithology:
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- Limestone
- AAPG geologic province:
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- Appalachian basin
Summary:
Pg. 278-280, pl. 4. Hallowell member of Cobourg Formation. Lower Cobourg limestone of earlier reports. Lower part lithologically similar to underlying Sherman Falls formation. Upper part composed of gray medium- to coarse-textured massive limestone with very few intercalated shales; contrasts with more argillaceous Hillier member (new) above. Thickness about 100 feet. Present in southern Ontario, Canada, and northern New York. Age is Middle Ordovician (Mohawkian).
Type section: at Picton, Hallowell Twp., Prince Edward Co., Ontario, Canada.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1650).
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 ([ ]).