Basal conglomerate of Maravillas chert at Rock House Gap; hammer rests on a 5-foot boulder of calcareous sandstone. Brewster County, Texas. 1930.
Dates
Date Taken
1930
Summary
Basal conglomerate of Maravillas chert at Rock House Gap; hammer rests on a 5-foot boulder of calcareous sandstone. Brewster County, Texas. November 1930. Plate 4-B, U.S.Geological Survey Professional paper 187. 1937.
Summary
Basal conglomerate of Maravillas chert at Rock House Gap; hammer rests on a 5-foot boulder of calcareous sandstone. Brewster County, Texas. November 1930. Plate 4-B, U.S.Geological Survey Professional paper 187. 1937.
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