[4] Limestone beds of the formation contain chonetid brachiopods (Chonetes) and gastropods.

Other fossils include the shark Helicoprion, the ammonoids Pseudogastrioceras and Perrinites hilli, the nautiloid Foordiceras, and the fusulinid Parafusulina.

[1] The unit was first designated as the Cutoff shaly member of the Bone Spring Limestone by P.B.

King in 1942, for exposures on the west face of Cutoff Mountain near the New Mexico - Texas border.

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