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

Rock structure

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1929-08-02

Salina strata highly inclined and folded

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

Sharp anticlinal elbow / Silurian (Clinton?)

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921-08-16

Sharp anticlinal fold in Devonian shale

Subject	Structure-Folds
Creator	Horich, Franklin J. W.
Date	1921-10-30

Sharp local fold, Sewickley sandstone horizon

Subject	Structure-Folds
Creator	Johnson, Meredith E., 1897-
Date	1921

Sharp monoclinal fold

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951

Sharp right-angled fold in Salina rocks

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921-08-16

Sharp syncline

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

Sharp syncline in vintage (?) dolomite (?)

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951

Small fold in Epler Formation

Subject	Structure-Folds
Creator	Geyer, Alan R.
Date	1956

Squeezed and contorted Birmingham shale

Subject	Structure-Folds
Creator	Johnson, Meredith E., 1897-
Date	1925-05-16

Steeply folded strata

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

Steeply folded strata

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

Steeply folded strata

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921-08-16

Steeply folded strata

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

Steeply inclined and folded rocks

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

Steeply inclined Salina rocks

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921-08-16

Stripping operation of Harmon Creek Coal Corporation

Subject	Structure-Folds
Creator	Graeber, Charles Karsner, 1896-
Date	1934-05-26

Structure of Limestone Ridge

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1931-07-17

Structure of Middle Silurian rocks

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1929-08-02

Structure on Route 22

Subject	Structure-Folds
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1931-06-05

Structure on Route 22

Subject	Structure-Folds
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1931-06-05

Structure on Route 22

Subject	Structure-Folds
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1931-06-05

Symetrical syncline in Silurian (Clinton) rock

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921-08-16

Syncline

Subject	Structure-Folds
Creator	Bolles, William H.
Date	1971-06-03

Syncline

Subject	Structure-Folds
Creator	Bolles, William H.
Date	1971-06-03

Syncline in Blue Mountain quarry

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1925-10-15

Syncline near pole 153-10

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

Syngenetic reclined folds in Martinsburg Formation graywackes

Subject	Structure-Folds
Creator	Root, Samuel I.
Date	1972-09-21

Syngenetic reclined folds in Martinsburg Formation graywackes

Subject	Structure-Folds
Creator	Root, Samuel I.
Date	1972-09-21

Syngenetic reclined folds in Martinsburg graywackes

Subject	Structure-Folds
Creator	Root, Samuel I.
Date	1972-09-21

Syngenetic upright folds

Subject	Structure-Folds
Creator	Root, Samuel I.
Date	1972-09-21

Syngenetic upright folds in Myerstown/Martinsburg Formation

Subject	Structure-Folds
Creator	Root, Samuel I.
Date	1972-09-21

Tight fold in the limestone of the Buffalo Springs member of the Conococheague

Subject	Structure-Folds
Creator	Geyer, Alan R.
Date	1953

Tight folds in Buffalo Springs member of Conococheague limestone

Subject	Structure-Folds
Creator	Geyer, Alan R.
Date	1953

Tight folds in thin-bedded limestone

Subject	Structure-Folds
Creator	Geyer, Alan R.
Date	1955

Tightly folded beds in Epler Formation

Subject	Structure-Folds
Creator	Geyer, Alan R.
Date	1956

Tightly folded limestone and dolomite beds

Subject	Structure-Folds
Creator	Geyer, Alan R.
Date	1952

To show relation of minor anticline to unfolded Medina

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1924-07-29

Vertical folding in Silurian rocks (Clinton?)

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921-08-16

View showing intense fold of mammoth bed

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1932-04-08

Whale and pups in Summit Hill stripping

Subject	Structure-Folds
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1933-07-19