Pg. 31, 33, fig. 7. Falcon limestone limestone member of Lykins formation. Impure limestone containing numerous thin, irregular, varvelike laminae of red silt ranging in thickness from paper thin to one-tenth inch. Locally several 2-inch seams of vuggy limestone contain black brittle bituminous material. Unit represented at Ralston Creek by unindurated irregularly interlaminated red and gray calcareous silt. Thickness ranges from 2 to 3.5 feet. At type locality, unit lies 46 feet stratigraphically below base of Glennon limestone (new) and 58 feet above Lyons formation. Underlies Bergen shale member (new); overlies Harriman shale member (new). [Age is Permian.]
Type section: west fork of Glennon Canyon, 1.5 mi southeast of Morrison, in NW/4 sec. 12, T. 5 S., R. 70 W., [approx. Lat. 39 deg. 38 min. 06 sec. N., Long. 105 deg. 11 min. 00 sec. W.], Morrison quadrangle, Jefferson Co., CO. Named from Mount Falcon, about 2.5 mi southwest of Morrison, in sec. 9, T. 5 S., R. 70 W., southwest part of Morrison quadrangle, Jefferson Co., CO.
See also L.W. LeRoy and John Hayes, 1957, No. 3, Golden-Morrison measured section, IN McKee, E.D., ed., Colorado measured sections, 1957, RMAG, p. 23-26, [pl. 3].

Source: US geologic names lexicon (USGS Bull. 1200, p. 1314); GNC files.

Is Permian member of Lykins Formation (Permian and Triassic?) mapped in central Jefferson Co, CO (Denver basin). Is second of five (ascending) members of Lykins. Outcrops in northeast part of quad; mapped as single line along Hogback. Conformably overlies Harriman Shale Member (Permian) of Lykins; conformably underlies Bergen Shale Member (Permian) of Lykins. Map unit described as thin very fine grained yellowish-gray limestone; well exposed as small hogback just north of Deer Creek. Thickness about 2.5 ft.

Source: GNU records (USGS DDS-6; Denver GNULEX).