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) |
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Upper Series |
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| 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) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| Ohio Fm, Huron Sh | Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties | Devonian Shale Structure* (633 KB) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| Ohio Fm, Dunkirk Sh | Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties | Devonian Shale Structure* (633 KB) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| Java Fm, Hanover Member | Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties | Devonian Shale Structure* (633 KB) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| Java Fm, Pipe Creek Sh | Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties | Devonian Shale Structure* (633 KB) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| West Falls Fm, Angola Member | Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties | Devonian Shale Structure* (633 KB) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| West Falls Fm, Rhinestreet Sh | Northwestern Pennsylvania, including Erie, Crawford, and Mercer Counties | Devonian Shale Structure* (633 KB) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| Sonyea Fm, Cashaqua Member | Northwestern Pennsylvania, including Crawford and Mercer Counties | Devonian Shale Structure* (633 KB) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| Sonyea Fm, Middlesex Sh | Northwestern Pennsylvania, including Crawford and Mercer Counties | Devonian Shale Structure* (633 KB) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| Genesee Fm, West River - Penn Yan Members | Northwestern Pennsylvania, including Crawford and Mercer Counties | Devonian Shale Structure* (633 KB) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| Genesee Fm, Geneseo Sh | Northwestern Pennsylvania, including Crawford and Mercer Counties | Devonian Shale Structure* (633 KB) Devonian Shales Isopach* (609 KB) |
PR182, SB8 | ||
| 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 | |
| Lock Haven Fm | Balltown, Bradford, and Elk sands of western Pennsylvania | Parts of northcentral and central Pennsylvania (see map) | Upper Devonian Oil and Gas Sands* (180 KB) | A74cd, A85ab, A86, A95a, M30, M34, M35, M36, MAP 14, PR182, SB8 | |
| 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 |
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| 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 | ||
| Back to Top | |||||
Lower Series |
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| 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) Needmore Shale Isopach Map* (142 KB) |
A48, A57, A64, A74ab, A74cd, A85ab, A86, A95a, M30, M35, M36, M73, M87, PR182, SB8 | ||
| 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) Oriskany Sandstone Isopach Map* (191 KB) Detailed Oriskany Stratigraphic Chart* (104 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 | ||
| 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 | ||
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