Subsurface Rock Correlation Chart


Devonian System

Click for a PDF version of the diagram for these units (1.06 MB, opens in a new window).

Devonian System (360– 405 MA)

 
 

UPPER SERIES

 

GROUP

FORMATION AND/OR UNIT

DRILLERS' NAMES

APPROXIMATE GEOGRAPHIC EXTENT

MAP

REFERENCES

 

 

Knapp Cgl

 

Northwestern Pennsylvania, including Warren, McKean, and parts of Erie, Crawford, Forest, and Elk Counties (see map)

Berea and Equivalent Sands    (179 KB)

M21, M38, M52, M62, OF-95-02, PR182, SB8

 

 

Corry Ss

 

Northwestern Pennsylvania, including Warren, McKean, and parts of Erie, Crawford, Forest, and Elk Counties (see map)

Berea and Equivalent Sands    (179 KB)

A33a, M22, M24, M25, M38, M52, M53, OF-95-02, PR118, PR182, SB2, SB3, SB4, SB8, W62

 

 

Berea Ss

Second Gas

Northwestern and western Pennsylvania, including Beaver, Mercer, Lawrence, and parts of Erie, Crawford, Venango, Butler, Allegheny, and Washington Counties (see map)

Berea and Equivalent Sands    (179 KB)

A5, A27, A57, M22, M52, M54, M87, PG4, PR122, PR178, PR182, SB1, SB8, SB9, W15, W46, W62

 

 

Bedford Sh

 

Western Pennsylvania, including Erie, Crawford, Venango, Mercer, Lawrence, Butler, Beaver, Warren, McKean, Forest, and Elk Counties (see map)

Berea and Equivalent Sands    (179 KB)

A33, M24, M25, M38, M87, PR118, PR122, PR178, PR182, SB7, SB8, SB9, W15, W46, W62

 

 

Cussewago Ss

Upper Thirty Foot, Gas

Northwestern Pennsylvania, including parts of Erie, Crawford, Mercer, and Venango Counties (see map)

Berea and Equivalent Sands    (179 KB)

A27, A33a, A36, A48, A55, A57, A64, A65, A74ab, A74cd, M22, M24, M25, M28, M29, M54, M87, PR122, PR178, PR182, SB1, SB7, SB8, W15, W46

 

 

Murrysville Ss

Murrysville

Much of western Pennsylvania, including part or all of Clarion, Jefferson, Clearfield, Butler, Armstrong, Indiana, Allegheny, Westmoreland, Washington, Fayette, and Greene Counties (see map)

Berea and Equivalent Sands    (179 KB)

A5, A27, A57, A64, A65, A74ab, A74cd, M28, M29, M54, M87, PR122, PR178, PR182, SB1, SB8, SB9

 

 

Ohio Fm, Chagrin Sh

 

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

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

Ohio Fm, Huron Sh

 

Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

Ohio Fm, Dunkirk Sh

 

Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

Java Fm, Hanover Member

 

Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

Java Fm, Pipe Creek Sh

 

Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

West Falls Fm, Angola Member

 

Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

West Falls Fm, Rhinestreet Sh

 

Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

Sonyea Fm, Cashaqua Member

 

Northwestern Pennsylvania, including Crawford and Mercer Counties

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

Sonyea Fm, Middlesex Sh

 

Northwestern Pennsylvania, including Crawford and Mercer Counties

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

Genesee Fm, West River - Penn Yan Members

 

Northwestern Pennsylvania, including Crawford and Mercer Counties

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

Genesee Fm, Geneseo Sh

 

Northwestern Pennsylvania, including Crawford and Mercer Counties

Devonian Shale Structure (633 KB)

PR182, SB8

 

 

 

Devonian Shales Isopach  (609 KB)

 

 

Riceville Sh

Drake

Northwestern Pennsylvania, including parts of Venango, Warren, and Forest Counties

 

M22, M24, M25, M38, M52, OF-95-02, PR122, PR182, SB8, W15, W62

 

 

Oswayo Fm

 

Much of western Pennsylvania, including Greene, Washington, Fayette, Allegheny, Westmoreland, Butler, Armstrong, Indiana, Jefferson, Clarion, Forest, Elk, McKean, and Warren Counties

 

3rd Survey 2, A64, A74ab, M28, M38, M54, M87, OF-95-02, PR182, SB1, W60

 

 

Venango Gr

Venango First, Tuna, Panama, Red Valley, White, Gantz, Fifty-Foot, Hundred Foot; Venango Second, Lytle, Rosenberry, Salt, Salamanca, Thirty-Foot, Upper Nineveh, Snee, Lower Nineveh; Venango Third Stray, Gray, Knox Third, Shira, Venango Third, Knox Fourth, Wolf Creek, Clarion, Gordon Stray, Black, Green, Boulder, Gordon, Third, Fourth, Washington, McDonald Fourth; Venango Fifth, Knox Fifth, Fifth, McDonald, Fifth A; Clarion, Byram, Conewango, LeBoeuf, Magee Hollow, Bayard, Bayard Stray, Elizabeth, Elizabeth Stray

Most of western Pennsylvania, from the Allegheny Structural Front to northwestern Pennsylvania (see map)

Upper Devonian Oil and Gas Sands    (180 KB)

3rd Survey 1, 3rd Survey 2, A27, A36, A37, A48, A55, A57, A64, A65, A74ab, A74cd, A85ab, A86, M21, M22, M24, M25, M28, M29, M38, M52, M53, M54, M57, M62, M87, OF-95-02, OF-95-07, PR118, PR122, PR178, PR182, SB1, SB2, SB3, SB4, SB7, SB8, SB9, W60, W62

 

 

Catskill Fm

Includes drillers’ sand names for the Venango Group down to the Warren and Speechley sands of the Bradford Group

Parts of northcentral, central, and southcentral Pennsylvania (see map)

Upper Devonian Oil and Gas Sands    (180 KB)

A54, A74cd, A85ab, A86, A95a, M30, M34, M35, M36, MAP 14, PR110, PR164, PR167, PR182, SB8, W67

 

 

Bradford Gr

Warren First, First Warren; Warren Second, Second Warren; Bradford First, Eighty-Foot, Queen, Glade, Third Warren; Clarendon Stray, Watsonville, Sugar Run, Clarendon, Kinzua, Upper Balltown, Dewdrop, Lower Balltown, Gartland, Upper Speechley, Speechley Stray, Speechley, Chipmunk; Cherry Grove, Tiona, Bradford Second; Cooper Stray, Silverville, Cooper, First Balltown; Klondike, Harrisburg Run, Deerlick, Second Balltown, Sliverville; Bradford Third, Lewis Run, Sheffield, Third Balltown; Upper Kane, Lower Kane, Bradford, Kane, Sartwell

Most of western Pennsylvania, west of the boundary created by the western limit of the Catskill and Lock Haven Formations, Allegheny Structural Front, and western limit of the Catskill, Foreknobs, and Scherr Formations to Fayette, eastern Allegheny, central Butler and Venango, and western Warren Counties (see map)

Upper Devonian Oil and Gas Sands    (180 KB)

3rd Survey 2, A27, A36, A37, A48, A55, A57, A64, A65, A74ab, A74cd, A85ab A86, M21, M22, M24, M25, M38, M52, M53, M62, M87, OF-95-02, PR116, PR118, PR122, PR125, PR163, PR178, PR182, SB2, SB3, SB4, SB5, SB6, SB7, SB8, SB9,W60

 

 

Elk Gr

Haskill, Riley, Elk; Humphrey, Benson, Alexander

Parts of western Pennsylvania, west of the boundary created by the western limit of the Catskill and Lock Haven Formations, Allegheny Structural Front, and western limit of the Catskill, Foreknobs and Scherr Formations to central Fayette and Westmoreland, western Indiana, Armstrong, Clarion, and McKean Counties (see map)

Upper Devonian Oil and Gas Sands    (180 KB)

A48, A55, A57, A64, A74ab, A74cd, A85ab, A86, M21, M38, M62, M87, PR178, PR182, SB5, SB6, SB8

 

 

Elk Gr

Haskill, Riley, Elk; Humphrey, Benson, Alexander

Parts of western Pennsylvania, west of the boundary created by the western limit of the Catskill and Lock Haven Formations, Allegheny Structural Front, and western limit of the Catskill, Foreknobs and Scherr Formations to central Fayette and Westmoreland, western Indiana, Armstrong, Clarion, and McKean Counties (see map)

Upper Devonian Oil and Gas Sands    (180 KB)

A48, A55, A57, A64, A74ab, A74cd, A85ab, A86, M21, M38, M62, M87, PR178, PR182, SB5, SB6, SB9

 

 

Foreknobs Fm

 

Much of Somerset and parts of Blair and Bedford Counties (see map)

Upper Devonian Oil and Gas Sands    (180 KB)

PR182, SB8

 

 

Scherr Fm

 

Much of Somerset and parts of Blair and Bedford Counties (see map)

Upper Devonian Oil and Gas Sands    (180 KB)

PR182, SB8

 

 

Chadakoin Fm

Pink Rock

Most of western and northcentral Pennsylvania

 

A48, A55, A57, A64, A65, A74ab, A74cd, A85ab A86, M21, M38, M52, M53, M62, M87, OF-95-02, OF-95-07, PR122, PR178, PR182, SB1, SB8, W62

 

 

Brallier Fm

 

Much of western and southcentral Pennsylvania, and occurs in place of Bradford and Elk Groups in portions of southwestern Pennsylvania

Upper Devonian Oil and Gas Sands    (180 KB)

A48, A57, A64, A74ab, A74cd, A85ab, A86, A95a, M21, M30, M35, M36, M38, M87, MAP 14, PR178, PR182, SB8

 

 

Harrell Fm

 

Central Pennsylvania

 

A74cd, A85ab, A86, A95a, M21, M30, M35, M36, M87, MAP 14, PR182, SB8

 

 

Burket Sh

 

Central Pennsylvania

 

A74cd, A85ab, A86, A95a, M21, M30, M35, M36, M87, PR182, SB8

 

Back to Top

 

MIDDLE SERIES

 

GROUP

FORMATION AND/OR UNIT

DRILLERS' NAMES

APPROXIMATE GEOGRAPHIC EXTENT

MAP

REFERENCES

 

Hamilton

Tully Ls

 

Most of study area, except where the “Drillers’ Tully” occurs in place of the true Tully Limestone (see map)

“Drillers’ Tully” and Tully Limestone (179 KB)

A48, A57, A64, A74ab, A74cd, A85ab, A86, A95a, M30, M35, M36, M73, M87, MAP 14, PR178, PR182, SB8

 

Hamilton

Hamilton Gr (undiv.)

 

Western Pennsylvania

 

A48, A57, A64, A74ab, M21, M30, M73, M87, PR178, PR182, SB8

 

 

Mahantango Fm

Chaneyville

Central Pennsylvania

 

A74cd, A85ab, A86, A95a, M35, M36, M73, PR182, SB8

 

Hamilton

Marcellus Fm

 

Entire study area

 

A48, A57, A64, A74ab, A85ab, A86, A95a, M21, M30, M35, M36, M73, M87, PR178, PR182, SB8

 

Hamilton

Seneca Ls

 

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

 

M35, M73, PR182, SB8

 

 

Purcell Ls

 

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

 

A74cd, A85ab, A86, A95a, M36, M73, PR182, SB8

 

Hamilton

Tioga Ash-Bed Zone

 

Occurs throughout study area (contains up to seven beds)

 

A48, A57, A64, A74ab, A74cd, A85ab, A86, A95a, M21, M30, M35, M36, M73, M87, PR178, PR182, SB8

 

 

Onondaga Fm, Moorehouse Member

 

Northwestern Pennsylvania, including Erie, Crawford, Mercer, Venango, Warren, McKean, Forest, and Elk Counties

 

M21, M73, PR178, PR182, SB8

 

 

Onondaga Fm, Nedrow member

 

Northwestern Pennsylvania, including Erie, Crawford, Mercer, Venango, Warren, McKean, Forest, and Elk Counties

 

M21, M73, PR178, PR182, SB8

 

 

Onondaga Fm, Edgecliff Member

 

Northwestern Pennsylvania, including Erie, Crawford, Mercer, Venango, Warren, McKean, Forest, and Elk Counties

 

M21, M73, PR178, PR182, SB8

 

 

Onondaga Ls

 

Entire study area

Onondaga Limestone Structure Map (545 KB)

A48, A57, A64, A74ab, M21, M30, M35, M36, M73, M87, PR124, PR178, PR182, SB8

 

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LOWER SERIES

 

GROUP

FORMATION AND/OR UNIT

DRILLERS' NAMES

APPROXIMATE GEOGRAPHIC EXTENT

MAP

REFERENCES

 

 

Bois Blanc Fm

 

Northwestern and western Pennsylvania, including Erie, Crawford, Venango, Mercer, and parts of Warren, McKean, Forest, Elk, Butler, Clarion, Armstrong, Jefferson, Indiana, and Clearfield Counties

 

A64, A74ab, A74cd, A85ab, M21, M73, M87, PR178, PR182, SB8, SB10, SB11

 

 

Huntersville Chert

 

Most of southwestern and central Pennsylvania

 

A48, A57, A64, A74ab, A74cd, A85ab, A86, A95a, M21, M30, M35, M36, M73, M87, PR182, SB8

 

 

Needmore Sh

 

Southcentral Pennsylvania

Needmore Shale Structure Map       (152 KB)

A48, A57, A64, A74ab, A74cd, A85ab, A86, A95a, M30, M35, M36, M73, M87, PR182, SB8

 

 

 

Needmore Shale Isopach Map (142 KB)

 

 

Oriskany Ss

 

Most of the study area, with the exception of areas of non-deposition identified as the Oriskany “No-Sand” Area (see structure map); this unit was formerly recognized as the Ridgeley Sandstone in southwestern and southcentral Pennsylvania

Oriskany Sandstone Structure Map       (244 KB)

A48, A57, A64, A74ab, A74cd, A85ab, A86, A95a, M21, M30, M35, M36, M59, M60, M73, M81, M87, MAP 9, PR106, PR107, PR109, PR111, PR124, PR133, PR138, PR142, PR178, PR182, SB8, SB10, SB11

 

 

 

Oriskany Sandstone Isopach Map (191 KB)

 

 

 

Detailed Oriskany Stratigraphic Chart     (104 KB)

 

Helderberg

Licking Creek Ls

 

Southwestern and central Pennsylvania

 

A48, A57, A64, A74cd, A85ab, A86, A95a, M21, M30, M73, M87, PR182, SB8, SB10, SB11

 

Helderberg

Shriver Chert

 

Southwestern and southcentral Pennsylvania

 

A48, A57, A74cd, A85ab, A86, A95a, M73, M87, PR182, SB8, SB10, SB11

 

Helderberg

Mandata Sh

 

Much of central and western Pennsylvania

 

A48, A57, A64, A74ab, A74cd, A85ab, A86, A95a, M21, M30, M73, M87, PR178, PR182, SB8, SB10, SB11

 

Helderberg

Corriganville – New Creek Lss

 

Most of study area, with the exception of Erie, Crawford, Mercer, Venango, Forest, and Warren Counties

 

A48, A57, A64, A74ab, A74cd, A85ab, A86, A95a, M21, M30, M73, M87, PR178, PR182, SB8, SB10, SB11

 

Helderberg

Manlius Ls

 

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

 

M21, M30, M73, PR178, PR182, SB8, SB10, SB11

 

Helderberg

Keyser Ls

 

Most of the study area, with the exception of Erie, Crawford, Mercer, and Venango Counties

 

A48, A57, A64, A74ab, A74cd, A85ab, A86, A95a, M21, M30, M73, M87, PR178, PR182, SB8, SB10, SB11