Named as member of Leithsville Formation. Named for Califon, Hunterdon, Co., northwestern NJ. Consists of gray, greenish-gray, buff-weathering dolomite. Lower part is stylolitic, ruditic, megacrystalline, and fossiliferous. Upper part is fine grained to cryptocrystalline. Thickness is about 30 m, ranges from 12 to 46 m. Overlies Hardyston Formation; underlies Hamburg Member of Leithsville. Age is Early Cambrian based on fossils.

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

The Califon Member at the base of the Leithsville ranges from 40 to 150 ft thick, but averages about 100 ft. This member consists of two distinct lithologies. The upper section consists of 20 to 50 ft of very fine to cryptogranular, light gray to locally light greenish gray, dense, sharp-breaking dolomite. The lower 20 to 100 ft varies from gray to dark gray, sparkly to bright, fine to medium megacrystalline, strongly stylolitic, ruditic, patchy-textured dolomite. Underlies the Hamburg Member of the Leithsville. Overlies Hardyston Formation. Author assigns an Early Cambrian age to the Leithsville, based on the discovery of the index fossil HYOLITHELLUS MICANS by Markewicz (1964, unpublished).

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