The following is a list of the mapped bedrock units in Pennsylvania. The rocks are listed in stratigraphic order. Note: Some of the Formations are laterally equivalent in age. They are listed in order from West to East in this case.
The following is a list of the mapped bedrock units in Pennsylvania. The rocks are listed in stratigraphic order. Note: Some of the Formations are laterally equivalent in age. They are listed in order from West to East in this case. (en)
The following is a list of the mapped bedrock units in Pennsylvania. The rocks are listed in stratigraphic order. Note: Some of the Formations are laterally equivalent in age. They are listed in order from West to East in this case. (en)