Stratigraphic Column

Location
The Duncannon Member of the Catskill Formation is stratigraphically below the Spechty Kopf Formation and above the Poplar Gap Member.

Description
The Duncannon Member (Dcd) is made up mostly of a red sandstone, siltstone and shale. The Duncannon Member contains fining-upward sequences up to 100 feet thick.

The sandstones which comprise the Duncannon Member are fine to very coarse grained and grayish red to grayish red-purple in color. The Duncannon Member is known to be crossbedded to Planar bedded in beds anywhere from 10 to 30 feet thick.

The siltstones found in the Duncannon Member are grayish red in color and can be anywhere from easily split to massive in size and nearly impossible to split. The siltstones in the Duncannon Member are often found interbedded with grayish red shale. This shale is usually marked with extensive cleavage.

Conglomerates have been spotted at the base of the Duncannon Member. The Duncannon Member is poorly exposed in most areas except along the Lehigh River. The conglomerate portion of this member has been known to form ridges and ledges with thicknesses approaching 750 feet.

Spechty Kopf

Rock Layers

Poplar Gap