Pennsylvania Geological Survey - Historical Photographs

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This collection includes photographs from the Pennsylvania Geological Survey Historical Photographs Collection.
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Antiformal fold defined by graywacke bed, Martinsburg Formation
Structure
Antiformal fold defined by graywacke bed, Martinsburg Formation. Enola, Pa.
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Apex of fold in Chickies quartzite
Structure
Apex of fold in Chickies quartzite, New Salem.
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Apex of sharp fold in Chickies quartzite
Structure
Apex of sharp fold in Chickies quartzite, near New Salem.
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Autochthonous basal limestones of the Martinsburg Formation
Structure
Autochthonous basal limestones of the Martinsburg Formation. Beds are in a series of isoclinal folds; pen is in the hinge of a syncline. At Sporting Hill Road along Conodoguinet Creek
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Bedding/transport surface
Structure
Bedding/transport surface
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Boudinage structures
Structure
Boudinage structures, Womelsdorf quadrangle. "Boudins" near Richland, Lebanon County
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Box fold, developed above a thrust in Martinsburg
Structure
Box fold, developed above a thrust in Martinsburg. Penn Central Railroad, cuts at Enola, East Pennsboro Township
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Cleavage and joint planes in red shale
Structure
Cleavage and joint planes in red shale (Martinsburg), north of Quittapahilla Creek
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Close up of fractured rock
Structure
Close up of fractured rock at rear off block V, to show more clearly displaced and broken rock. Taken from (X), (fig. 11). 2.3 miles north of Easton
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Contorted shale beneath massive sandstone
Structure
Contorted shale beneath massive sandstone in first cut west of Irwin, Pennsylvania Railroad, Greensburg quadrangle.
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Crumpled limestone
Structure
Crumpled limestone (traced more accurately in negative no. 1273). South edge of Northampton.
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Crumpled strata in limestone quarry
Structure
Crumpled strata in limestone quarry. South edge of Northampton.
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Delaware Water Gap
Structure
Delaware Water Gap, south of Interstate 80, mile 305
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Diabase joints
Structure
Diabase joints, Devil's Den at Gettysburg Battlefield
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Dolomite beds, boudinaged
Structure
Dolomite beds, boudinaged
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Dolomite beds, boudinaged
Structure
Dolomite beds, boudinaged
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Dolomite quarry
Structure
Dolomite quarry. Pennsylvania Limestone and Cement Company, Rheems.
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Epler/Myerstown with S0 all in S1
Structure
Epler/Myerstown with S0 all in S1. Crinoids extended parallel to lineations on S1. Upper Allen Township
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Epler/Myerstown with S0 all in S1
Structure
Epler/Myerstown with S0 all in S1, Upper Allen Township
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Fault and contorted strata in Warrior
Structure
Fault and contorted strata in Warrior, a little southeast of fault shown in negative no. 1149., 20-20
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