It preserves fossils dating back to the early Cretaceous period.

The lower member is mostly calcareous shale with some interbedded fine sandstone and nodular limestone, while the upper member is fossiliferous medium-gray limestone interbedded with tan shale.

[1] The base of the formation is a prominent 0.1 meters (0.33 ft) ferruginous sandstone bed that is in sharp contact with the limy mudstone of the underlying Finlay Limestone.

[1][2] These include bivalves such as grapheids, exogyrids, pectens, and oysters; gastropods; spatangoid echinoderms; ammonoids; corals; sponges; and serpulid worms.

Small fossils include dasycladacean algae, ostracods, foraminiferans, echinoderms, and serpulids.