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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Lost Run conglomerate
  • Modifications:
    • Named
  • Dominant lithology:
    • Conglomerate
  • AAPG geologic province:
    • Appalachian basin
Publication:

Swartz, F.M., 1948, Silurian relations at Susquehanna Gap in Blue or Kittatinny Mountains, 5 miles north of Harrisburg, Pennsylvania, IN Guidebook for the 14th annual field conference of Pennsylvania geologists: Field Conference of Pennsylvania Geologists, no. 14, 12 p.


Summary:

Named the Lost Run conglomerate for Lost Run northeast of Lewistown, Mifflin Co., central PA. Consists of conglomerate with pebbles of vein quartz, quartz-veined quartzite, chert and jasper, and rarely, quartz-veined meta-argillite. Traced eastward from Lewistown, the ridge-making member of the Bald Eagle sandstone becomes the Lost Run conglomerate. Thickness is 350 feet in Lost Run area. Overlies the Bald Eagle sandstone and underlies the Juniata red beds. The Lost Run is of Late Ordovician age.

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


Map showing publication footprint
  • Usage in publication:
    • Lost Run member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Appalachian basin
Publication:

Conlin, R.R., and Hoskins, D.M., 1962, Geology and mineral resources of the Mifflintown quadrangle, Pennsylvania: Pennsylvania Geological Survey Topographic and Geologic Atlas, 4th series, 126, 46 p., scale 1:24,000


Summary:

Revised the Lost Run as the Lost Run member of the Bald Eagle formation. Unit overlies and underlies unnamed units of the Bald Eagle.

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 ([ ]).