Pennsylvania Geological Survey - Historical Photographs - Browse all items - Pennsylvania Photos and Documents

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Pennsylvania Geological Survey - Historical Photographs - Browse all items - Pennsylvania Photos and Documents

Silurian-Devonian contact

Subject	Stratigraphy
Creator	Willard, Bradford, 1894-
Date	1932-08-01

Silurian, Medina

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1929-08-03

Silurian rocks

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921

Silurian rocks (detail)

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921

Silurian rocks (detail) red shale and sandstone

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921

"Silurian Time Zone" sign

Subject	Stratigraphy
Creator	Bolles, William H.
Date	1970-05-22

Silurian trilobite

Subject	Fossils
Date	1970

Simon's Coal Mine, Broad Top field

Subject	Mineral Resources-Coal
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1942-08

Sinkhole

Subject	Sinkholes
Creator	Bolles, William H.
Date	1973-11-01

Sinkhole

Subject	Sinkholes
Creator	Bolles, William H.
Date	1971-04-16

Sinkhole

Subject	Sinkholes
Creator	Bolles, William H.
Date	1971-04-16

Sinkhole along Route 322

Subject	Sinkholes
Creator	Bolles, William H.
Date	1971-03-16

Sinkhole along Route 322

Subject	Sinkholes
Date	1971-04-16

Sinkhole at Derry Township

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	circa 1971

Sinkhole at northeast corner of intersection of 422 and Quarry Road

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkhole at northeast corner of intersection of Route 422 and Quarry Road

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkhole at northeast corner of intersection of Route 422 and Quarry Road

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkhole at northeast corner of intersection of Route 422 and Quarry Road

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkhole at northeast corner of intersection of Route 422 and Quarry Road

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkhole at northeast corner of intersection of Route 422 and Quarry Road

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkhole at northeast corner of intersection of Route 422 and Quarry Road

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkhole at northeast corner of intersection of Route 422 and Quarry Road

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkhole collapse at storm drain

Subject	Sinkholes
Date	1968-07

Sinkhole, Derry Township

Subject	Sinkholes
Creator	Bolles, William H.
Date	1971

Sinkhole, Derry Township

Subject	Sinkholes
Creator	Bolles, William H.
Date	1971

Sinkhole, Derry Township

Subject	Sinkholes
Creator	Bolles, William H.
Date	1971

Sinkhole, Derry Township

Subject	Sinkholes
Creator	Bolles, William H.
Date	1971

Sinkhole, Derry Township

Subject	Sinkholes
Creator	Bolles, William H.
Date	1971

Sinkhole east side of Bullfrog Valley Road

Subject	Sinkholes
Creator	Bolles, William H.
Date	1971-11?

Sinkhole from which Arch Spring emerges

Subject	Sinkholes
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1924-08-23

Sinkhole in Epler Formation

Subject	Sinkholes
Creator	Bolles, William H.
Date	1968-06

Sinkhole in limestone (?) blanketed with talus gravel

Subject	Sinkholes
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1934-08

Sinkhole northwest corner of Route 422 and Hummelstown

Subject	Sinkholes
Creator	Bolles, William H.
Date	1973-11

Sinkhole outline in fields along Route 322

Subject	Sinkholes
Creator	Bolles, William H.
Date	Winter 1971

Sinkhole outline in fields along Route 322

Subject	Sinkholes
Creator	Bolles, William H.
Date	Winter 1971

Sinkhole, Palmyra Borough

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkhole, Palmyra Borough

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkhole, Palmyra Borough

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971

Sinkholes

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971-03-02

Sinkholes

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971-03-02

Sinkholes

Subject	Sinkholes
Creator	Bolles, William H.
Date	1970-07

Sinkholes

Subject	Sinkholes
Creator	Bolles, William H.
Date	1970-04-08

Sinkholes along Route 39

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971-02-26

Sinkholes along Route 39

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971-02-26

Sinkholes along Route 39

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1971-02-26

Sinkholes at Milton Hershey Medical Center

Subject	Sinkholes
Creator	Bolles, William H.
Date	1970

Sinkholes Derry Township

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	1972

Sinkholes developed along Route 39

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	Winter 1971

Sinkholes developed along Route 39

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	Winter 1971

Sinkholes developed along Route 39

Subject	Sinkholes
Creator	Geyer, Alan R.
Date	Winter 1971