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Geologic Unit: Fonda
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Map showing publication footprint
  • Usage in publication:
    • Fonda limestone member
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Calcarenite
    • Calcilutite
  • AAPG geologic province:
    • Appalachian basin
Publication:

Fisher, D.W., 1954, Lower Ordovician (Canadian) stratigraphy of the Mohawk Valley, New York: Geological Society of America Bulletin, v. 65, no. 1, p. 71-96.


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 ( ).

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