- Usage in publication:
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- Wallkill blue limestone*
- Modifications:
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- Named
- Dominant lithology:
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- Limestone
- AAPG geologic province:
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- Appalachian basin
Summary:
Name Wallkill blue limestone introduced for a generally blue limestone, fine-grained, homogeneous, becoming arenaceous or shaly as it merges into underlying Hardistonville [Hardyston] quartzite. One belt of it occupies Wallkill Valley south of Franklin Furnace.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Wallkill limestone†
- Modifications:
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- Abandoned
- AAPG geologic province:
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- Appalachian basin
Summary:
The term Kittatinny limestone is preferable for this unit as it is not well exposed along Wallkill River, and it is preeminently the great limestone formation of the Kittatinny Valley.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Wallkill Member
- Modifications:
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- Reinstated
- Dominant lithology:
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- Dolomite
- AAPG geologic province:
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- Appalachian basin
Summary:
Wallkill limestone, named for valley north of Hamburg village is here reinstated as Wallkill Member of Leithsville Formation. Described as dark gray dolomite, 400 to 500 ft thick at type section. Underlies Limeport Member of Allentown Formation; overlies Hamburg Member of Leithsville. Age is [Middle] Cambrian.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Wallkill Member
- Modifications:
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- Overview
- AAPG geologic province:
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- Appalachian basin
Summary:
Upper part of Leithsville is referred to as Wallkill Member in NJ, but it is poorly to rarely exposed. It consists of dark-gray, patchy dolomite and overlies the Hamburg Member on the east side of the Wallkill Valley, north of Hamburg. Underlies the Limeport Member of the Allentown Formation. Thickness ranges from 350 to 500 ft. It is estimated that the Leithsville in NJ varies from 500 to 800 ft thick. Author assigns an Early Cambrian age to the Leithsville, based on the discovery of the index fossil HYOLITHELLUS MICANS by Markewicz (1964, unpublished).
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 ([ ]).