It preserves fossils dating back to the Middle Devonian.

The lower strata are made up of sandy dolomite along with limestone and nodular chert.

There is only a small amount of macrofossils known from the lower Dundee which contrasts the nearby Delaware Limestone.

This lack of macrofossils can potentially be attributed to highly saline periods of time.

As time went on, there is evidence that a lagoon or another near-shore environment formed, allowing for an influx of fauna.