Pg. 3. Nebo sandstone. Massive fine white sandstone, containing only grains of fine white sand and small quartz pebbles. Thickness 500 feet. Overlies Nichols shale. Underlies Murray shale. Age is Early Cambrian.

Source: US geologic names lexicon (USGS Bull. 896, p. 1469).

[Current (ca. 1936) adopted usage of the USGS]. Nebo quartzite of Chilhowee group. Age is Early Cambrian.
Named from Mount Nebo Springs, on Mount Nebo, [Chilhowee Mountain, Kinzel Springs 7.5-min quadrangle], Blount Co., eastern TN. Extends into western NC.
[Additional locality information from US geologic names lexicon, USGS Bull. 1200, p. 2696-2697, USGS historical topographic map collection TopoView, accessed March 4, 2013.]

Source: US geologic names lexicon (USGS Bull. 896, p. 1469).

Age constraints for the Vendian to Placentian Chilhowee Group are provided by, 1) the occurrence of Vendian acritarchs in the subjacent Sandsuck, Wilhite, and Shields Formations; 2) the first occurrence of PALAEOPHYCUS traces in the basal Cochran and Unicoi Formations; 3) the first occurrences of SKOLOTHOS and PLANOLITES traces in the overlying Nichols and Hampton Formations; 4) the abundance of well-developed arthropod as well as other diagnostic traces in the uppermost Nebo and overlying Murray Formations; 5) the recalculated age of 539ñ30 Ma for the Murray Formation; and 6) reported occurrences of late Placentian or younger body fossils recovered from the Murray Shale, including trilobites, ostracodes, inarticulate brachiopods, hylithoids, and acritarchs. The sequence in the Cochran-Unicoi interval where the Precambrian-Cambrian boundary is interpreted to occur consists of coarse-grained braided-fluvial sediments. It may prove impossible to locate the boundary precisely because of a lack of marine facies, and the shelly microfossils it might have provided.

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