Subsurface Rock Correlation Chart


Permian to Mississippian Systems

 

Click for a PDF version of the diagram for these units (1.05 MB, opens in a new window).

Permian System (250 – 290 MA)

 
 

LOWER SERIES

 

GROUP

FORMATION AND/OR UNIT

DRILLERS' NAMES

APPROXIMATE GEOGRAPHIC EXTENT

MAP

REFERENCES

 

Dunkard

Greene, Washington, and Waynesburg Fms (undiv.)

 

Southwestern Pennsylvania, including most of Greene and Washington Counties, and parts of Allegheny, Westmoreland, and Fayette Counties

 

A27, A37, A48, C26, C30, G59, MAP 42, W35, W37, W38, W60, W63

 

Dunkard

Waynesburg coal

 

Southwestern Pennsylvania, including most of Greene and Washington Counties, and parts of Allegheny, Westmoreland, and Fayette Counties

 

A27, A37, A48, C26, C30, G59, M86, M91, M93, M94, M95, MAP 42, OF-98-13, W35, W38, W60, W63

 

Pennsylvanian System (290 – 330 MA)

 

GROUP

FORMATION AND/OR UNIT

DRILLERS' NAMES

APPROXIMATE GEOGRAPHIC EXTENT

MAP

REFERENCES

 

 

Monongahela Fm

 

Much of western Pennsylvania, including Fayette, Lawrence, Jefferson, Indiana, Cambria, Clearfield, Elk, Greene, Somerset, Beaver, Armstrong, Allegheny, Butler, Westmoreland, and Washington Counties

 

3rd Survey 1, A27, A36, A37, A48, A57, C26, C30, C56A, G59, MAP 42, W9, W34, W35, W37, W38, W39, W60, W63

 

 

Monongahela Fm, Uniontown coal

 

Southwestern Pennsylvania, including Greene, Fayette, Somerset, Indiana, Allegheny, Beaver, Armstrong, Washington, and Westmoreland Counties

 

3rd Survey 1, A27, A36, A37, A48, A57, C26, C30, G59, M95, MAP 42, OF-98-13, W9, W34, W35, W37, W38, W39, W60, W63

 

 

Monongahela Fm, Pittsburgh coal

Big Seam

Much of western Pennsylvania, including Fayette, Lawrence, Jefferson, Indiana, Cambria, Clearfield, Elk, Greene, Somerset, Beaver, Armstrong, Allegheny, Butler, Westmoreland, and Washington Counties

 

3rd Survey 1, A27, A36, A37, A48, A57, C26, C30, C56A, G59, IC80, M86, M89, M91, M93, M94, M95, M98, MAP 42, MAP 43, MAP 45, OF-98-13, W9, W34, W35, W37, W38, W39, W60, W63

 

Conemaugh

Casselman Fm

 

Much of western Pennsylvania, including Lawrence, Beaver, Fayette, Somerset, Indiana, Greene, Washington, Elk, Butler, parts of Venango, Clarion, Armstrong, Allegheny, Westmoreland, Clearfield, Jefferson, and Cambria Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A36, A37, A48, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, C26, C30, C56A, G59, M28, M29, M54, M87, MAP 42, PR110, PR122, SB1, W9, W32, W34, W35, W36, W37, W38, W39, W45, W60, W63, W67

 

Conemaugh

Casselman Fm, Morgantown Ss

Murphy Stray, Murphy, Mitchell

Much of western Pennsylvania, including Lawrence, Beaver, Fayette, Somerset, Indiana, Greene, Washington, Elk, Butler, parts of Venango, Clarion, Armstrong, Allegheny, Westmoreland, Clearfield, Jefferson, and Cambria Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A36, A37, A48, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, C26, C30, C56A, G59, M28, M29, M54, M87, MAP 42, PR110, PR122, SB1, W9, W32, W34, W35, W36, W37, W38, W39, W45, W60, W63, W67

 

Conemaugh

Glenshaw Fm

 

Much of western Pennsylvania, including Lawrence, Beaver, Fayette, Somerset, Indiana, Greene, Washington, Elk, Butler, parts of Venango, Clarion, Armstrong, Allegheny, Westmoreland, Clearfield, Jefferson, and Cambria Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A36, A37, A48, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, C26, C30, C56A, G59, M28, M29, M54, M87, M99, MAP 42, PR110, PR122, SB1, W9, W32, W34, W35, W36, W37, W38, W39, W45, W60, W63, W67

 

Conemaugh

Glenshaw Fm, Ames Ls

 

Much of western Pennsylvania, including Lawrence, Beaver, Fayette, Somerset, Indiana, Greene, Washington, Elk, Butler, parts of Venango, Clarion, Armstrong, Allegheny, Westmoreland, Clearfield, Jefferson, and Cambria Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A36, A37, A48, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, C26, C30, C56A, G59, M28, M29, M54, M87, M99, MAP 42, PR110, PR122, SB1, W9, W32, W34, W35, W36, W37, W38, W39, W45, W60, W63, W67

 

Conemaugh

Glenshaw Fm, Buffalo Ss

Little Dunkard

Much of western Pennsylvania, including Lawrence, Beaver, Fayette, Somerset, Indiana, Greene, Washington, Elk, Butler, parts of Venango, Clarion, Armstrong, Allegheny, Westmoreland, Clearfield, Jefferson, and Cambria Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A36, A37, A48, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, C26, C30, C56A, G59, M28, M29, M54, M87, M99, MAP 42, PR110, PR122, SB1, W9, W32, W34, W35, W36, W37, W38, W39, W45, W60, W63, W67

 

Conemaugh

Glenshaw Fm, Mahoning Ss

Big Dunkard, Hurry Up

Much of western Pennsylvania, including Lawrence, Mercer, Blair, Beaver, Fayette, Greene, Washington, Elk, Butler, parts of Venango, Clarion, Indiana, Armstrong, Allegheny, Westmoreland, Somerset, Clearfield, Jefferson, Cambria, and parts of Centre Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, A95a, C26, C30, C56A, G59, M28, M29, M54, M75, M87, M99, MAP 42, PR110, PR122, SB1, W9, W32, W34, W35, W36, W37, W38, W39, W45, W60, W63, W67

 

 

Allegheny Fm, Upper Freeport coal

 

Most of the study area, including Lawrence, Beaver, Allegheny, Venango, Greene, Westmoreland, Fayette, Somerset, Jefferson, Clarion, Cameron, Indiana, Armstrong, Clearfield, Elk, Cambria, Blair, Centre, McKean, Butler, Mercer, and parts of Washington Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, A95a, C26, C30, C56A, G59, IC61, IC80, M25, M28, M29, M48, M54, M55, M75, M76, M87, M89, M90, M91, M92, M94, M95, M96, M98, M99, MAP 42, MAP 43, MAP 49, OF-98-13, PR110, PR122, SB 1, W9, W16, W32, W34, W35, W36, W37, W39, W45, W60, W67

 

 

Allegheny Fm, Freeport Ss

Upper Gas

Most of the study area, including Lawrence, Beaver, Allegheny, Venango, Greene, Westmoreland, Fayette, Somerset, Jefferson, Clarion, Cameron, Indiana, Armstrong, Clearfield, Elk, Cambria, Blair, Centre, McKean, Butler, Mercer, and parts of Washington Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, A95a, C26, C30, C56A, G59, IC61, M25, M28, M29, M54, M87, M99, MAP 42, PR110, PR122, SB1, W9, W16, W32, W34, W35, W36, W37, W39, W45, W60, W67

 

 

Allegheny Fm, Lower Worthington Ss

First Gas, Middle Gas, Kittanning

Most of the study area, including Lawrence, Beaver, Allegheny, Venango, Greene, Westmoreland, Fayette, Somerset, Jefferson, Clarion, Cameron, Indiana, Armstrong, Clearfield, Elk, Cambria, Blair, Centre, McKean, Butler, Mercer, and parts of Washington Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, A95a, C26, C30, C56A, G59, IC61, M25, M28, M29, M54, M87, M99, MAP 42, PR110, PR122, SB1, W9, W16, W32, W34, W35, W36, W37, W39, W45, W60, W67

 

 

Allegheny Fm, Vanport Ls

 

Most of the study area, including Lawrence, Beaver, Allegheny, Venango, Greene, Westmoreland, Fayette, Somerset, Jefferson, Clarion, Cameron, Indiana, Armstrong, Clearfield, Elk, Cambria, Blair, Centre, McKean, Butler, Mercer, and Washington Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, A95a, C26, C30, C56A, G59, IC61, M24, M25, M28, M29, M54, M87, M99, MAP 42, PG4, PR110, PR122, SB1, W9, W16, W32, W34, W35, W36, W37, W39, W45, W60, W67

 

 

Allegheny Fm, Clarion Ss

Lower Gas

Most of the study area, including Lawrence, Beaver, Allegheny, Venango, Greene, Westmoreland, Fayette, Somerset, Jefferson, Clarion, Cameron, Indiana, Armstrong, Clearfield, Elk, Cambria, Blair, Centre, McKean, Butler, Mercer, and Washington Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, A95a, C26, C30, C56A, G59, IC61, M24, M25, M28, M29, M54, M87, M99, MAP 42, PG4, PR110, PR122, SB1, W9, W15, W16, W32, W33, W34, W35, W36, W37, W39, W45, W60, W67

 

 

Pottsville Fm, Homewood Ss

First Salt

Most of the study area, including Lawrence, Beaver, Indiana, Allegheny, Venango, Westmoreland, Fayette, Somerset, Jefferson, Clarion, Clearfield, Elk, Cambria, Blair, Centre, Greene, Washington, Clinton, Potter, Cameron, Forest, Warren, McKean, Mercer, Butler, and Armstrong Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, A95a, C26, C30, C56A, IC61, M24, M25, M28, M29, M34, M36, M38, M54, M87, M99, MAP 42, OF-95-02, PG4, PR110, PR116, PR122, SB1, W9, W15, W16, W32, W33, W34, W36, W37, W39, W45, W60, W67

 

 

Pottsville Fm, Connoquenessing Ss

Second Salt, Maxton, Third Salt

Most of the study area, including Lawrence, Beaver, Indiana, Allegheny, Venango, Westmoreland, Fayette, Somerset, Jefferson, Clarion, Clearfield, Elk, Cambria, Blair, Centre, Greene, Washington, Clinton, Potter, Cameron, Forest, Warren, McKean, Mercer, Butler, Armstrong, Crawford, Lycoming, and Tioga Counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, A95a, C26, C30, C56A, IC61, M21, M22, M24, M25, M28, M29, M30, M34, M35, M36, M38, M52, M54, M62, M87, M99, MAP 42, OF-95-02, PG 4, PR110, PR122, PR164, PR167, SB1, W9, W15, W16, W32, W33, W34, W36, W37, W39, W45, W46, W60, W67

 

 

Pottsville, Fm, 

.

Parts of northwestern and northcentral Pennsylvania, including McKean, Crawford, Forest, Warren, Lycoming, Clinton, Lawrence, Beaver, Venango, Jefferson, Clarion, Clearfield, Indiana, Elk, Centre, Potter, Cameron, Butler, Mercer, and Armstrong counties

 

3rd Survey 1, 3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, A95a, C26, C30, C56A, IC61, M21, M22, M24, M25, M28, M29, M30, M36, M38, M52, M62, M87, M99, MAP 42, OF-95-02, PR110, PR122, PR167, W9, W32, W33, W34, W36, W37, W39, W45, W46, W60, W67

 

Olean Cgl

 

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Mississippian System (330 – 360 MA)

 

GROUP

FORMATION AND/OR UNIT

DRILLERS' NAMES

APPROXIMATE GEOGRAPHIC EXTENT

MAP

REFERENCES

 

 

Mauch Chunk “red beds”

 

Southwestern and southcentral Pennsylvania, including Blair, Bedford, Huntingdon, Fulton, Beaver, Allegheny, Washington, Westmoreland, Fayette, Somerset, Indiana, Armstrong, Greene, and Cambria Counties

 

A5, A27, A36, A37, A48, A55, A57, A65, A86, C26, C30, C56A, M28, M29, M87, MAP 14, MAP 42, PR164, PR167, SB1, W34, W37, W39, W60, W67

 

 

Wymps Gap Ls

 

Southwestern and southcentral Pennsylvania, including Beaver, Allegheny, Washington, Westmoreland, Fayette, Greene, Somerset, Indiana, and Cambria Counties

 

A5, A27, A36, A37, A48, A55, A57, A65, A86, C26, C30, C56A, M28, M29, M54, M87, MAP 14, MAP 42, PR122, PR164, PR167, SB1, W34, W37, W39, W60, W67

 

 

Deer Valley Ls

 

Southwestern and southcentral Pennsylvania, including Beaver, Allegheny, Washington, Westmoreland, Fayette, Greene, Somerset, Indiana, and Cambria Counties

 

A5, A27, A36, A37, A48, A55, A57, A65, A86, C26, C30, C56A, M28, M29, M54, M87, MAP 14, MAP 42, PR122, PR164, PR167, SB1, W34, W37, W39, W60, W67

 

 

Greenbrier Ls

 

Southwestern Pennsylvania, including Beaver, Allegheny, Washington, Westmoreland, Fayette, Greene, Indiana, Armstrong, Butler, Clarion, and Jefferson Counties

 

AA5, A27, A36, A37, A48, A55, A57, A65, C26, C30, M28, M29, M54, M87, MAP 42, PR122, SB1, W32, W34, W36, W37, W39, W45, W60, W67

 

 

Loyalhanna Fm

 

Southwestern and southcentral Pennsylvania, including Blair, Bedford, Huntingdon, Fulton, Beaver, Allegheny, Washington, Westmoreland, Fayette, Somerset, Indiana, Armstrong, Greene, and Cambria Counties

 

A5, A27, A36, A37, A48, A55, A57, A65, A86, C26, C30, C56A, M28, M29, M87, MAP 14, MAP 42, PR164, PR167, SB1, W34, W37, W39, W60, W67

 

 

Burgoon Ss

Big Injun, Mountain

Most of the study area, including Lawrence, Blair, Beaver, Allegheny, Venango, Westmoreland, Fayette, Somerset, Jefferson, Clarion, Indiana, Armstrong, Clearfield, Centre, Greene, Crawford, Forest, Warren, Washington, Potter, Clinton, Cameron, McKean, Tioga, Lycoming, Elk, Mercer, Butler, and Cambria Counties

 

3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, A85ab, A85cd, A86, A95a, C26, C30, C56A, M22, M24, M25, M28, M29, M30, M34, M35, M36, M38, M52, M53, M54, M62, M87, MAP 14, MAP 42, OF-95-02, PR110, PR118, PR122, PR164, PR167, PR178, SB1, W16, W32, W33, W34, W36, W37, W39, W45, W60, W67

 

 

Shenango Fm

Squaw

Most of the study area, including Erie, Crawford, Mercer, Venango, Lawrence, Beaver, Allegheny, Washington, Westmoreland, Greene, Fayette, Warren, McKean, Forest, Elk, Clarion, Butler, Armstrong, Jefferson, Indiana, and Clearfield Counties

 

3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, C26, C30, M22, M24, M25, M28, M29, M38, M52, M53, M54, M62, M87, MAP 42, OF-95-02, PR110, PR118, PR122, PR178, SB1, W15, W16, W32, W33, W34, W36, W37, W39, W45, W46, W60, W62, W67

 

Cuyahoga

Cuyahoga Gr (undiv.)

 

Most of the study area, including Erie, Crawford, Mercer, Venango, Lawrence, Beaver, Allegheny, Washington, Westmoreland, Greene, Fayette, Warren, McKean, Forest, Elk, Clarion, Butler, Armstrong, Jefferson, Indiana, and Clearfield Counties

 

3rd Survey 2, A5, A27, A33a, A36, A37, A48, A54, A55, A57, A64, A65, A74ab, A74cd, A75, A84cd, C26, C30, M22, M24, M25, M28, M29, M38, M52, M53, M54, M62, M87, MAP 42, OF-95-02, PR110, PR118, PR122, PR178, SB1, W15, W16, W32, W33, W34, W36, W37, W39, W45, W46, W60, W62, W67

 

Cuyahoga

Sunbury Sh

 

Northwestern Pennsylvania, including Erie, Crawford, Mercer, and Venango Counties

 

M22, M24, M25, W46, W62

 

 

Patton Sh

 

Most of central Pennsylvania and parts of western Pennsylvania, including Butler, Clarion, Armstrong, Jefferson, Indiana, Clearfield, Cambria, Somerset, Cameron, Clinton, Lycoming, Blair, Huntingdon, Bedford, and Fulton Counties

 

M34, M35, M36, PR164, PR167

 

 

Huntley Mountain Fm

 

Northcentral Pennsylvania (see map)

Berea and equivalent sands (179 KB)

M30, M34, M35, M36, PR164, PR167, PR182, SB8

 

 

Rockwell Fm

 

Southcentral Pennsylvania (see map)

Berea and equivalent sands (179 KB)

A85ab, A85cd, A86, A95a, C56A, PR182, SB8, W67

 

 

Riddlesburg Sh

 

Southcentral Pennsylvania, including Clearfield, Centre, Union, Snyder, Cambria, Blair, Huntingdon, Mifflin, Juniata, Somerset, Bedford, and Fulton Counties

 

A85ab, A85cd, A86, A95a, C56A, PR182, SB8, W67

 

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