Pg. 46 and passim. Silvertip conglomerate member of Madison limestone. Basal member of Madison limestone. Consists of massive limestone-breccia conglomerate with angular pebbles up to 4 or 5 inches long. On Pentagon Mountain the pebbles are banded gray limestone; on Lone Butte they are of brown petroliferous limestone. Matrix is light-gray, crystalline, argillaceous, white-gray weathering limestone. In general the pebbles are finer grained than the matrix, and some of them are slightly rounded. Is known only to occur in 3 areas --Lone Butte, Spotted Bear Mountain, and Pentagon Mountain. Thickness 140 feet on Lone Butte, 23 on Spotted Bear Mountain. Underlies Saypo limestone member and disconformably overlies Spotted Bear limestone member of Jefferson limestone (Middle Devonian). Age is Mississippian.
Named from Silvertip syncline, because it is thickest on Lone Butte, [in T. 23 N., R. 13 W., Amphitheatre Mountain 7.5-min quadrangle (1994 ed.), Flathead Co.], which lies nearly in center of syncline.

Source: US geologic names lexicon (USGS Bull. 896, p. 2001).

Silvertip conglomerate member of Madison limestone. Rocks are included in DA1 unit (Upper Devonian) which is chiefly collapse breccia where exposed. Underlies MC unit (Early Mississippian, Kinderhook).

Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 3609).

Pg. 2008. Silvertip Conglomerate Member [of Madison Limestone], recorded by Deiss (1943, Stratigraphy Saypo quadrangle, Montana, GSA Bull., v. 52, no. 2, p. 243) as basal unit of Mississippian rocks of this area, has not been recognized by us. A collapse breccia near top of Devonian sequence (Sloss and Laird, 1945) may have been called conglomerate by Deiss.

Source: Publication.