Derivation.—From Mt. Stephen, the type locality.
Character.—Limestones and shales, calcareous and siliceous.
Thickness.—In Mt. Bosworth section, 640 feet; on Mt. Stephen, 562 feet, with 150 feet of local development of Ogygopsis shales at the summit.
Organic Remains.—Middle Cambrian: Ogygopsis fauna of Mt. Stephen and fauna below in the thin-bedded, dark bluish gray limestone.
Cathedral Formation
Type Locality.—Cathedral Mountain and Cathedral Crags, east of Mt. Stephen and southeast of Mt. Bosworth.
Derivation.—From Cathedral Mountain, the type locality.
Character.—Massive arenaceous and dolomitic limestone.
Thickness.—In Mt. Bosworth section, 1,595 feet; in Castle Mountain, 987 feet; in Cathedral Mountain and Mt. Stephen, 1,600-1,800 feet.
Organic Remains.—Middle Cambrian.
Mt. Whyte Formation
Type Locality.—Mt. Whyte, above Lake Agnes, and eastern slope of Popes Peak, southwest of Mt. St. Piran.
Derivation.—From Mt. Whyte, the type locality.
Character.—Alternating bands of limestone and siliceous and calcareous shale.
Thickness.—North slope of Mt. Whyte, 386 feet; south slope of Mt. Bosworth, 390 feet; Mt. Stephen, above railroad tunnel, 315 feet; southeast slope of Castle Mountain, 248 feet.
Organic Remains.—Lower Cambrian.
BOW RIVER GROUP
This name was proposed by Dr. George M. Dawson for the great series of arenaceous and siliceous strata beneath the Castle Mountain group of McConnell. This series will ultimately be divided into several formations. At present the upper portion may be separated into three formations in the vicinity of Lake Louise.
St. Piran Formation
Type Locality.—Southeast slope of Mt. St. Piran. The basins of Lakes Agnes and Mirror are both excavated in this formation.
