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National Geologic Map Database
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  • Usage in publication:
    • Etna Furnace Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Dolomite
  • AAPG geologic province:
    • Appalachian basin
Publication:

Spelman, A.R., 1966, Stratigraphy of Lower Ordovician Nittany Dolomite in central Pennsylvania: Pennsylvania Geological Survey General Geology Report, 4th series, no. 47, 187 p.


Summary:

Named the Etna Furnace Member of the Nittany Dolomite in central PA as the uppermost member of the formation. Consists of light-gray, finely crystalline, laminated or structureless dolomite with sand- and silt-size quartz grains. Unit is similar to the Forge Union Member at the base of the Nittany. Thickness is 130 feet at Bellefonte, 300 feet at Mount Etna, and 240 feet at Clover Creek. Overlies the Shoenberger Member of the Nittany and underlies the Axemann Limestone. The Etna Furnace is of Early Ordovician age.

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 ([ ]).