Pennsylvania Geological Survey - Historical Photographs

Active Filters:
  • Location Covered = Blair
  • Contributing Institution = Pennsylvania Geological Survey
  • Subject = Sinkholes

About This Collection

This collection includes photographs from the Pennsylvania Geological Survey Historical Photographs Collection.
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Arch Spring from upper end of tunnel in sinkhole
Arch Spring from upper end of tunnel in sinkhole
Sinkholes
Arch Spring from upper end of tunnel in sinkhole. Note daylight seen through opening. Arch Spring, Blair County.
Sinkhole from which Arch Spring emerges
Sinkhole from which Arch Spring emerges
Sinkholes
Sinkhole from which Arch Spring emerges. Tunnel to open valley is about twenty feet long. Arch Spring, Blair County.