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  • Usage in publication:
    • Lake Katrine Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Claystone
    • Mudstone
    • Shale
  • AAPG geologic province:
    • Appalachian basin
Publication:

Mazzo, C.R., and La Fleur, R.G., 1984, Stratigraphy of the Port Ewen Formation (Lower Devonian), eastern New York: Northeastern Geology, v. 6, no. 2, p. 71-82.


Summary:

The Port Ewen Formation of the Helderberg Group is subdivided into two members in the Silurian-Devonian outcrop belt in eastern New York. The lower member is here named the Lake Katrine Member. It consists of dark-gray to brown weathering, fissile to hackly, burrow mottled, nonresistant, platy claystone, mudstone, and shale with bioclastic debris and coarse-grained carbonate at the base. Transitionally overlies the Alson Formation; underlies the East Kingston Member of the Port Ewen. Thickness at type section is 6 m. Age is Early Devonian.

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 ([ ]).

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