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Basal Silurian ledge

Subject	Stratigraphy
Creator	Willard, Bradford, 1894-
Date	1932-09-02

Basalt dike (?)

Subject	Igneous and Metamorphic
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1929-08-02

Basalt dike (?)

Subject	Igneous and Metamorphic
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1929-08-02

Basalt from Stony Ridge

Subject	Igneous and Metamorphic
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1924-07-21

Basalt Trap Rock Company Plant (in course of construction)

Subject	Metallic Mineral Resources
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date

Base of Catskill (at left of figure) top of Chemung (right)

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1923-08-21

Base of Morgantown sandstone

Subject	Stratigraphy
Creator	Johnson, Meredith E., 1897-
Date	1921-09-01

Base of Morgantown sandstone

Subject	Stratigraphy
Creator	Johnson, Meredith E., 1897-
Date	1922-10-15

Base of Morgantown sandstone, Elk Lick coal and clay

Subject	Stratigraphy
Creator	Johnson, Meredith E., 1897-
Date	1921-11-01

Base of Morgantown sandstone, Elk Lick coal and clay

Subject	Stratigraphy
Creator	Johnson, Meredith E., 1897-
Date	1921-11-01

Base of pier failure in limestone collapse

Subject	Engineering Geology
Creator	Geyer, Alan R.
Date	197?

Base of pier failure in limestone collapse

Subject	Engineering Geology
Creator	Geyer, Alan R.
Date	197?

Base of pier failure in limestone collapse

Subject	Engineering Geology
Creator	Geyer, Alan R.
Date	197?

Base of pier failure in limestone collapse

Subject	Engineering Geology
Creator	Geyer, Alan R.
Date	197?

Base of second cooling tower

Subject	Cities, Towns, and Buildings
Creator	Geyer, Alan R.

Basic X-ray Unit

Subject	Miscellaneous
Creator	Koppe, Edwin F.
Date	1957

Bastard coal and rooster coal

Subject	Stratigraphy
Creator	Johnson, Meredith E., 1897-
Date	1925-05-30

Baughman Rocks (Homewood sandstone)

Subject	Stratigraphy
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1935-07-22

Baughman Rocks (Homewood sandstone)

Subject	Stratigraphy
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1935-07-22

Baughman Rocks (Pottsville conglomerate)

Subject	Stratigraphy
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1936-04-24

Baughman Rocks, Pottsville sandstone, Mount Davis

Subject	Stratigraphy
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1935-05-22

"B" coal mined; "C" coal at top of highwall

Subject	Mineral Resources-Coal
Creator	Shepps, Vincent C. (Vincent Chester), 1928-
Date	1960

Beach and wave studies

Subject	Geomorphology
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1930-08-02

Beach and wave studies

Subject	Geomorphology
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1930-08-02

Beach and wave studies

Subject	Geomorphology
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1930-08-02

Beach with wave lines

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

Bear Cave

Subject	Caves
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1930-04-02

Beaver dam in Prouty Creek

Subject	Engineering Geology
Creator	Shaffner, Marchant N. (Marchant Nissley), 1897-1990
Date	1931-08-01

Beaver Falls

Subject	Rivers and Streams
Creator	Ashley, Geo. H. (George Hall), 1866-1951

Beaver River at Beaver Falls

Subject	Rivers and Streams
Creator	Ashley, Geo. H. (George Hall), 1866-1951

Beaver River, looking north from Tenth Street Bridge

Subject	Rivers and Streams
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1926-10-05

Beaver River near Beaver Falls

Subject	Rivers and Streams
Creator	Ashley, Geo. H. (George Hall), 1866-1951

Beck and Boale Coal Company

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1928-09-18

Bedding and faulting in Carlim limestone

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1923-08-22

Bedding faces

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

Bedding/transport surface

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

Bedford Oil and Gas Company well No. 2

Subject	Oil and Gas
Creator	Johnson, Meredith E., 1897-
Date	1922-07-29

Bed of Lake Cowanesque at Elkland

Subject	Glacial Geology
Creator	Willard, Bradford, 1894-
Date	1931-08-01

Beekmantown dolomite railroad cut

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1929-04-23

Beekmantown limestone

Subject	Nonmetallic Mineral Resources
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1927-09-13

Beekmantown limestone

Subject	Nonmetallic Mineral Resources
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1925-04-14

Beekmantown limestone along Pennsylvania Turnpike

Subject	Nonmetallic Mineral Resources
Creator	Foose, Richard Martin, 1915-
Date	1941

Beginning excavation for University of Pittsburgh Memorial Building, Pittsburgh

Subject	Cities, Towns, and Buildings
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date

Beginning excavation for University of Pittsburgh Memorial Building, Pittsburgh

Subject	Cities, Towns, and Buildings
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date

Bellefonte Lime Company

Subject	Structure-Folds
Creator	Stone, Ralph W. (Ralph Walter), 1876-1964
Date	1923-07-11

Bellefonte Lime Company quarry

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1929-06-04

Bellefonte Lime Company quarry

Subject	Stratigraphy
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1929-06-04

Bell plane tabling

Subject	Survey Staff
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date	1921-08-18

Beltzville Dam


Subject	State Parks Surface Water Engineering Geology
Creator	Bolles, William H.

Bench at top of gravel deposit 1380' (200' above river), Illinoian age

Subject	Glacial Geology
Creator	Ashley, Geo. H. (George Hall), 1866-1951
Date