Geologic column of Taylorville [Taylorsville] region shows Taylorville slates as 1800 ft thick and of Silurian(?) age. Underlies Arlington beds and overlies Montgomery limestone or Grizzly quartzite.

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

Taylorville slates (Diller, 1892) is named Taylorsville formation [for exposures on east face of spur above limestone about 1 mi south of Taylorsville, Plumas Co, CA]. Consists chiefly of slates and thin-bedded sandstones, among which there are numerous small layers of fine black chert or occasional less regular masses of red chert, but at base there is locally fine greenish-gray conglomerate with indistinct pebbles and near middle well-defined bed of light-colored quartzite. Thickness is 1800 ft. Rests with probable unconformity on Montgomery limestone and in places Grizzly formation. Is older than Arlington formation, from which it is separated by granites. Fossils are not distinctive but formation is believed to be Devonian(?).

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

Age of fossiliferous Taylorsville Formation is Silurian [no basis given].

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

Unit abandoned as its rocks are considered equivalent to the more recently designated Sierra City melange (of Shoo Fly Complex). [Shoo Fly Complex is a more recent interpretation of these rocks' tectonic history.]

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