Stratigraphic Column

Below are seven geologic formations (rock layers) that are found in the Lehigh Gorge. Click on either a link below or on an area in the stratigraphic column on the left to learn more about each layer. The colors on the stratigraphic column correspond to the colors on the geologic map for each formation.

Llewellyn
Pottsville
Mauch Chunk
Pocono
Spechty Kopf
Duncannon
Poplar Gap