- Usage in publication:
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- Fonda limestone member
- Modifications:
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- Original reference
- Dominant lithology:
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- Calcarenite
- Calcilutite
- AAPG geologic province:
-
- Appalachian basin
Summary:
Pg. 76 (fig. 2), 89-90. Fonda limestone member of Tribes Hill Formation. Name proposed for youngest most fossiliferous member of formation in Mohawk Valley. Silty, sandy phosphatic calcarenites and dolomitic calcilutite predominate; rest of unit consists of pebble conglomerates, calcitic dolomite, steel-gray dolomisiltite and oolitic dolomitic limestone. Contains ripple marks, cross-laminations, and mud cracks filled with glauconite. Maximum thickness 22 feet; has variable thickness and spotty distribution. Overlies Wolf Hollow member (new); unconformably underlies Chuctanunda Creek dolomite (new). Age is Early Ordovician (early Canadian).
Type locality: abandoned quarry 0.5 mile east of Stone Ridge, Montgomery Co., east-central NY.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1382).
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 ([ ]).