U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: LaVale
Map showing publication footprint
  • Usage in publication:
    • LaVale Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Appalachian basin
Publication:

Head, J.W., III, 1972, Upper Silurian-Lower Devonian stratigraphy and nomenclature in the central Appalachians, IN Guidebook for the 37th annual field conference of Pennsylvania geologists: Field Conference of Pennsylvania Geologists, no. 37, p. 96-103.


Summary:

Named LaVale Member of Keyser Limestone for LaVale, Allegany Co., MD. Consists of 10.5 meters of banded, laminated carbonate lithofacies and stromatoporoids. Unit is recognized in northwest MD, VA, and WV. It overlies the Jersey Shore Member of the Keyser Limestone and underlies the New Creek Limestone; therefore, it is the uppermost member of the Keyser. Age is considered Early Devonian.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • LaVale Member*
  • Modifications:
    • Areal extent
    • Age modified
    • Biostratigraphic dating
  • AAPG geologic province:
    • Appalachian basin
Publication:

Denkler, K.E., and Harris, A.G., 1988, Conodont-based determination of the Silurian-Devonian boundary in the Valley and Ridge province, northern and central Appalachians, IN Sando, W.J., ed., Shorter contributions to paleontology and stratigraphy: U.S. Geological Survey Bulletin, 1837-B, p. B1-B13.


Summary:

The LaVale Member of the Keyser Limestone of Head (1972) is here accepted for use by the USGS in MD, PA, VA, and WV. It overlies the Jersey Shore Member of the Keyser; underlies the New Creek Limestone. Age is Late Silurian and Early Devonian.

Source: GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).