Subsurface Rock Correlation Chart


Silurian to Ordovician Systems

Click for a PDF version of the diagram for these units (1.0 MB, opens in a new window).

 

Silurian System (405 – 430 MA)
SERIES
GROUP
FORMATION AND/OR UNIT
APPROXIMATE GEOGRAPHIC EXTENT
MAP
REFERENCES
Upper
 
Bass Islands Dol
 
M21, M73, PR178, SB10, SB11
Upper
Salina
G
 
A64, A74ab, M21, M58, M73, PR178, SB10, SB11
Upper
Salina
Camillus Sh
 
A64, A74ab, M21, M58, M73, PR178, SB10, SB11
Upper
Salina
F
 
A64, A74ab, M21, M58, M73, PR178, SB10, SB11
Upper
Salina
E
 
A64, A74ab, M21, M58, M73, PR178, SB10, SB11
Upper
Salina
E Sh
 
A64, A74ab, M21, M58, M73, PR178, SB10, SB11
Upper
Salina
D
 
A64, A74ab, M21, M58, M73, PR178, SB10, SB11
Upper
Salina
C Sh
 
A64, A74ab, M21, M58, M73, PR178, SB10, SB11
Upper
Salina
B
Western and northcentral Pennsylvania; eastern limit roughly follows central Fayette, Westmoreland, Indiana, and Clearfield Counties; parts of Cameron, Clinton, and Lycoming Counties; and the eastern boundary of Tioga County
 
A64, A74ab, M21, M58, M73, PR178, SB10, SB11
Upper
Salina
A2
Western and northcentral Pennsylvania; eastern limit roughly follows central Fayette, Westmoreland, Indiana, and Clearfield Counties; parts of Cameron, Clinton, and Lycoming Counties; and the eastern boundary of Tioga County
 
A64, A74ab, M21, M58, M73, PR178, SB10, SB11
Upper
Salina
A1
Western and northcentral Pennsylvania; eastern limit roughly follows central Fayette, Westmoreland, Indiana, and Clearfield Counties; parts of Cameron, Clinton, and Lycoming Counties; and the eastern boundary of Tioga County
 
A64, A74ab, M21, M58, M73, PR178, SB10, SB11
Upper
 
Tonoloway Ls
 
A64, A74ab, A86, M21, M73, SB10, SB11
Upper
 
Wills Creek Sh
 
A86, M73, SB10, SB11
Upper
 
Bloomsburg Fm
 
A86, M73, SB10, SB11
Middle
 
Lockport Dol
 
M21, M73, PR178, SB10, SB11
Middle
 
Lockport Fm; DeCew Dol
 
M21, M73, PR178, SB10, SB11
 
McKenzie Fm
Much of the study area, including southwestern and central Pennsylvania
 
A86, M73, SB10, SB11
Clinton
Irondequoit Dol
Northwestern Pennsylvania and much of western Pennsylvania
 
M21, M73, PR178, SB10, SB11
Clinton
Dayton Dol
Northwestern Pennsylvania and portions of western and southwestern Pennsylvania
 
M73, PR178, SB10, SB11
Clinton
Reynales Dol
Northwestern Pennsylvania and much of western Pennsylvania
 
M21, M73, PR178, SB10, SB11
Clinton
Rochester Sh
Entire study area
 
A86, M21, M73, PR178, SB10, SB11
Middle
 
Keefer Ss
 
A86, M73, SB10, SB11
Middle
 
Rose Hill Sh
 
A86, M21, M73, SB10, SB11
Lower
Medina
Grimsby Ss
M21, M60, M73, M85, PR138, PR178, SB10, SB11
Medina Group Detailed Strat. Chart        (176 KB)
Lower
Medina
Cabot Head Sh
M21, M60, M73, M85, PR138, PR178, SB10, SB11
 
Medina Group Detailed Strat. Chart        (176 KB)
Lower
Medina
Whirlpool Ss
M21, M60, M73, M85, PR138, PR178, SB10, SB11
Medina Group Detailed Strat. Chart        (176 KB)
Lower
 
Castanea Member
A86, M73, SB10, SB11
Medina Group Detailed Strat. Chart        (176 KB)
Lower
 
Tuscarora Ss
A86, M73, SB10, SB11
Medina Group Detailed Strat. Chart        (176 KB)
Ordovician (430 – 500 MA)
SERIES
GROUP
FORMATION AND/OR UNIT
APPROXIMATE GEOGRAPHIC EXTENT
MAP
REFERENCES
Upper
 
Queenston Sh
M21, M73, PR178
Upper
 
Juniata Fm
A86, M73
Upper
 
Reedsville Sh
 
A86, PR178
Upper
 
Bald Eagle Fm
 
A86
Upper
 
Utica Sh
 
G49, PR178
Upper
 
Antes Sh
 
PR178
Upper
 
Trenton Ls
 
Upper
 
Black River Ls
 
Upper
 
Coburn Fm
 
Upper
 
Salona Fm
 
Upper
 
Nealmont Fm
 
Upper
 
Linden Hall Fm
 
Upper
 
Snyder Ls
 
Upper
 
Hatter Ls
 
Middle
 
Loysburg Fm
 
Middle
 
Loysburg Fm: Clover Member
 
Middle
 
Loysburg Fm: Milroy Member
 
Middle
 
Wells Creek Fm
 
G49, PR178
Middle
Beekmantown
Upper Bellefonte Dol
 
A86, G49
Middle
Beekmantown
Lower Bellefonte Dol
 
A86, G49
Lower
Beekmantown
Nittany Fm
A86, G49
Lower
Beekmantown
Larke Fm
G49

 

 

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