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

REFERENCES

 

Upper

Gatesburg Fm: Mines Member

Most of the study area, with the exception of portions of northwestern Pennsylvania

G49, PR178

 

Upper

Gatesburg Fm: Upper Sandy member

Most of the study area, with the exception of portions of northwestern Pennsylvania

G49, PR178

 

Upper

Gatesburg Fm: middle dolomite member

Western Pennsylvania

G49, PR178

 

Upper

Gatesburg Fm: Ore Hill Member

Central Pennsylvania

G49

 

Upper

Gatesburg Fm: Lower Sandy member

Entire study area

G49, PR178

 

Upper

Gatesburg Fm: Stacy Member

Southcentral Pennsylvania

G49

 

Upper

Warrior Fm

Entire study area

G49, PR178

 

Upper

Potsdam Ss

Northwestern to northcentral Pennsylvania (see maps)

G49, PR178

 
 
 
 
 

Middle

Pleasant Hill Fm

Central Pennsylvania; correlative relationships between southcentral and western Pennsylvania not established due to lack of drilling data

 

 

Lower

Waynesboro Fm

Southcentral Pennsylvania; correlative relationships between southcentral and western Pennsylvania not established due to lack of drilling data

G49

 

Lower

Tomstown Fm

Southcentral Pennsylvania; correlative relationships between southcentral and western Pennsylvania not established due to lack of drilling data

 

 

Lower

Antietam Fm

Southcentral Pennsylvania; correlative relationships between southcentral and western Pennsylvania not established due to lack of drilling data

 

 

SERIES

UNIT

APPROXIMATE GEOGRAPHIC EXTENT

REFERENCES

 

 

Crystalline Basement

Entire study area

IC62, PR178