Sneakover Limestone Member shown in correlation table as uppermost unit of the Orr Formation in the House Range, UT. Age is Late Cambrian (Franconian).

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

Name proposed for the upper member of Orr Formation. Recognized in House and Fish Springs Ranges, and Cricket and Wah Wah Mountains (Great Basin province). Consists of (ascending) a light- to medium-gray, thin- to thick-bedded calcarenite that forms ledgy outcrops, and a medium- to dark-gray calcisiltite. Is 185 feet (56.4 m) thick at type where it overlies Corset Spring Shale Member (reduced in rank) of Orr Formation, and underlies Notch Peak Formation (a massive cliff-forming calcilutite and calcisiltite that contrasts with the ledges of the Sneakover). Correlates with: Notch Peak Formation of southern Snake Range, NV; Hicks Formation of Deep Creek Range, UT; Fera Limestone of Dugway Range, UT; and Opex Formation and Ajax Dolomite of East Tintic Mountains, UT. Contains trilobite and brachiopod fossils. Age is Late Cambrian.
Named from Sneakover Pass in central House Range, Millard Co., UT (Great Basin province).
Type section: composite of two measured sections on northeast side of Orr Ridge, House Range, Millard Co., UT. Lower part on northeast face of hill 6593, in SE/4 sec. 28, T. 18 S., R. 13 W.; remainder in sec. 33, T. 18 S., R. 13 W., Notch Peak 15-min quadrangle.
Reference section designated near Lawson Cove Reservoir, northern Wah Wah Mountains.

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

Underlies the newly named Hellnmaria Member of Notch Peak Formation in Millard Co, UT, Great Basin province. Is of Late Cambrian (Franconian) age. Correlation chart. Upper contact easy to select. Sneakover is a silty, medium-bedded, ledge-forming lime-mudstone with phosphatic brachiopods and trilobites, whereas basal Notch Peak forms massive cliffs and is barren of shelly fossils.

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