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 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

Site of Washington's first fight

Date
Subject	Stratigraphy Sedimentation
Creator	Willard, Bradford, 1894-

Site of Washington's first fight

Subject	Stratigraphy
Creator	Willard, Bradford, 1894-
Date	1933-08-01

Slab showing beach mud flow surface

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1930-07-31

Slump structures in Keyser Limestone

Subject	Stratigraphy
Creator	Hoskins, Donald M.
Date	1964

Slump structures in Keyser Limestone

Subject	Stratigraphy
Creator	Hoskins, Donald M.
Date	1964

Slump structures in Keyser Limestone

Subject	Stratigraphy
Creator	Hoskins, Donald M.
Date	1964

Slump structures in Keyser Limestone

Subject	Stratigraphy
Creator	Hoskins, Donald M.
Date	1964

Smokey Hill Section

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1941-09

Snitz Creek dolomite

Subject	Stratigraphy
Creator	Geyer, Alan R.
Date	1968

South bank of Youghiogheny River

Subject	Stratigraphy
Creator	Hickok, W. O. (William Orville), 1905-
Date	1934-07-01

Spheroidal weathering of Hamilton shale

Date
Subject	Sedimentation Stratigraphy
Creator	Willard, Bradford, 1894-

Springfield Falls

Subject	Stratigraphy
Creator	Graeber, Charles Karsner, 1896-
Date	1934-08-22

Springs issuing from joints in Pottsville (?) sandstone

Subject	Stratigraphy
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1933-09-29

Stonehenge Formation

Subject	Stratigraphy
Creator	Geyer, Alan R.
Date	1956

Stonehenge Formation

Subject	Stratigraphy
Creator	Geyer, Alan R.
Date	1956

Stonehenge Formation

Subject	Stratigraphy
Creator	Geyer, Alan R.
Date	1960

Storm rollers

Subject	Stratigraphy Sedimentation
Creator	Moseley, John Reed

Storm rollers

Subject	Stratigraphy Sedimentation
Creator	Moseley, John Reed

Storm rollers in Chemung near Summit

Subject	Stratigraphy
Creator	Cathcart, S. H. (Stanley Holman), 1889-
Date	1932-06

Storm rollers in Chemung near Summit

Subject	Stratigraphy
Creator	Cathcart, S. H. (Stanley Holman), 1889-
Date	1932-06

Storm rollers in Chemung sandstone

Date
Subject	Stratigraphy Sedimentation
Creator	Willard, Bradford, 1894-

Storm rollers in Chemung sandstone

Date
Subject	Stratigraphy Sedimentation
Creator	Willard, Bradford, 1894-

Storm roller, Trimmers Rock

Subject	Stratigraphy Sedimentation
Creator	Moseley, John Reed

Stratigraphy

Subject	Stratigraphy Survey Staff

Stratigraphy

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1923-08-23

Stratigraphy

Subject	Stratigraphy

Stratigraphy

Subject	Stratigraphy Survey Staff

Stratigraphy

Subject	Stratigraphy
Creator	Stose, George Willis, 1869-1960; Bissell, Malcolm H.
Date	1928

Stratigraphy

Subject	Stratigraphy
Creator	Bissell, Malcolm H.; Stose, George Willis, 1869-1960
Date	1928

Stratigraphy

Subject	Stratigraphy
Creator	Geyer, Alan R.

(Strike) fault of undeterminable displacement

Subject	Stratigraphy
Creator	Bissell, Malcolm H.; Stose, George Willis, 1869-1960
Date	1928

Stromatolites of the Cryptozoon type

Subject	Stratigraphy
Creator	Geyer, Alan R.
Date	1958

Stromatolites of the Cryptozoon type

Subject	Stratigraphy
Creator	Geyer, Alan R.
Date	1961

Stromatolites of the Cryptozoon type

Subject	Stratigraphy
Creator	Geyer, Alan R.
Date	1958

Stromatolites of the Cryptozoon type

Subject	Stratigraphy
Creator	Geyer, Alan R.
Date	1958

Stromatolites of the Cryptozoon type

Subject	Stratigraphy
Creator	Geyer, Alan R.
Date	1958

Stromatolites of the gymnosolen type

Subject	Stratigraphy
Creator	Geyer, Alan R.
Date	1958

Surface of Stone's River

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

Taken along the Huntingdon and Broad Top Railroad between Cove and Hummel Station


Subject	Stratigraphy Sedimentation
Creator	Evans, B. F.

Talus after blasting

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

Talus in Millard sand pit

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

Talus in Millard sand pit

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

Talus in Millard sand pit

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

Talus material

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

Talus Medina sandstone

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921-07-01

Talus of Medina (?) sandstone near Water Street

Subject	Stratigraphy
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1922-08-29

Talus slope

Subject	Stratigraphy