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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Allegrippus conglomerate
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Conglomerate
  • AAPG geologic province:
    • Appalachian basin
Publication:

White, I.C., 1885, The geology of Huntingdon County, [Pennsylvania]: Pennsylvania Geological Survey Report of Progress, 2nd series, v. T3, 471 p.


Summary:

Pg. 99-100. Allegrippus conglomerate. White quartz pebbles in matrix of grayish white sand. Thickness 5 to 10 feet. Forms Allegrippus [Allegrippis] Ridge, Huntingdon County, central Pennsylvania. Overlain by olive shales and thin sandstone, and underlain by 450 feet of shales, all belonging to Chemung formation. [Age is Late Devonian.]

Source: US geologic names lexicon (USGS Bull. 896, p. 34).


Map showing publication footprint
  • Usage in publication:
    • Allegrippis sandstone member*
  • Modifications:
    • Revised
  • Dominant lithology:
    • Sandstone
  • AAPG geologic province:
    • Appalachian basin
Publication:

Butts, Charles, 1945, Hollidaysburg-Huntingdon folio, Pennsylvania: U.S. Geological Survey Geologic Atlas of the United States Folio, GF-227, 20 p., scale 1:62,500


Summary:

Pg. 12, pls. (Huntingdon quadrangle). Allegrippis sandstone member of Chemung formation. Three sandstones separated by shale; thickness 77 feet (section 5, near Saxton). Generally, it is a greenish-gray sandstone, weathering white, but locally is a coarse conglomerate and commonly has layers or pockets of conglomeratic sandstone. Occurs about 1,400 feet above Piney Ridge sandstone member of Chemung, and a considerable distance below Saxton conglomerate member of Chemung. Age is Late Devonian.

Source: Publication; US geologic names lexicons (USGS Bull. 896, p. 34; USGS Bull. 1200, p. 55).


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 ([ ]).