Digital Subsurface Rock Correlation Chart


Cambrian to Precambrian Systems

Click for a PDF version of the diagram for these units (868 KB, opens in a new window).

 

Cambrian System (500-570 MA)
SERIES
FORMATION AND/OR UNIT
APPROXIMATE GEOGRAPHIC EXTENT
MAP
REFERENCES
Gatesburg Fm: Mines Member
Most of the study area, with the exception of portions of northwestern Pennsylvania
Knox Unconformity Structure Map          (303 kb)
G49, PR178
Gatesburg Fm: Upper Sandy member
Most of the study area, with the exception of portions of northwestern Pennsylvania
G49, PR178
Gatesburg Fm: middle dolomite member
Western Pennsylvania
G49, PR178
Gatesburg Fm: Ore Hill Member
Central Pennsylvania
G49
Gatesburg Fm: Lower Sandy member
Entire study area
G49, PR178
Gatesburg Fm: Stacy Member
Southcentral Pennsylvania
G49
Warrior Fm
Entire study area
G49, PR178
Upper
Potsdam Ss
Northwestern to northcentral Pennsylvania (see maps)

Rock units that Comprise the Cambrian Basal Sandstones            (395 KB)

G49, PR178
Cambrian Basal Sandstone Stucture Map                           (331 KB)
 
Pleasant Hill Fm
Central Pennsylvania; correlative relationships between southcentral and western Pennsylvania not established due to lack of drilling data
 
Waynesboro Fm
Southcentral Pennsylvania; correlative relationships between southcentral and western Pennsylvania not established due to lack of drilling data
G49
Tomstown Fm
Southcentral Pennsylvania; correlative relationships between southcentral and western Pennsylvania not established due to lack of drilling data
 
Antietam Fm
Southcentral Pennsylvania; correlative relationships between southcentral and western Pennsylvania not established due to lack of drilling data
 
UNIT
APPROXIMATE GEOGRAPHIC EXTENT
MAP
REFERENCES
Entire study area
 
IC62, PR178
Precambrian Basement Map of the Appalachian Basin and Piedmont Province in Pennsylvania     (OFGG 05-01.0)