Character.—Alternating bands of thin shaly limestone and calcareous shale.
Thickness.—570 feet.
Organic Remains.—Middle Cambrian fauna.
Swasey Formation
Type Locality.—Slopes of Swasey Peak, House Range, Utah.
Derivation.—From Swasey Peak, the type locality.
Character.—Bluish gray, oolitic, and arenaceous limestone, with some calcareous and argillaceous shales.
Thickness.—238 feet.
Organic Remains.—Middle Cambrian fauna.
Dome Formation
Type Locality.—At the head of Dome Canyon, House Range, Utah.
Derivation.—From Dome Canyon, the type locality.
Character.—Massive bedded, gray siliceous limestone.
Thickness.—355 feet.
Organic Remains.—No traces of fossils, but referred to the Middle Cambrian because both overlaid and underlaid by rocks containing a Middle Cambrian fauna.
Howell Formation
Type Locality.—In slopes of Howell Peak, on the west side of the House Range, about 5 miles west of Antelope Springs, House Range, Utah.
Derivation.—From Howell Peak, the type locality.
Character.—Dark, more or less massive limestone and pinkish argillaceous shales.
Thickness.—640 feet.
Organic Remains.—Middle Cambrian fauna.
Pioche Formation
Type Locality.—Southeast of the town of Pioche, Nevada, on road to Panaca, Utah.
Derivation.—From Pioche, the type locality.
Character.—Arenaceous and argillaceous shaly layers with some thin layers and bands of limestone more or less irregularly interbedded and limited in horizontal distribution.
Thickness.—At Pioche, Nevada, 210 feet. On the west face of the Highland Range, 18 miles west of Pioche, this formation
