Page:Canadian Alpine Journal I, 2.djvu/80

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Canadian Alpine Journal

worth, so the measured and estimated thickness of 1680 feet on Mount Stephen is given in the section. No attempt was made to carry the section from Mount Stephen across to Mount Dennis through the Bosworth formation owing to local displacement and the alteration of the strata in Mount Dennis.

MIDDLE CAMBRIAN. (Summit of Mountain)

Eldon Formation
1a. Massive bedded, gray, siliceous and dolomitic limestone, estimate 2700 + ft.
1b. Bluish-gray limestone with bands of dark siliceous shale in lower portion 190 ft.
Fauna—Middle Cambrian.
The fossils are very poorly preserved but the following have been recognized:

Protospongia (spicules)
Lingulella, species undetermined.
Hyolithes, species undetermined.
Agnostus, cf. montis Matthew.
Zacanthoides spinosus (Walcott)
Ptychoparia, species undetermined.
Bathyuriscus (pygidium)
Ogygopsis (pygidium)

1c. Gray arenaceous and dolomitic limestone 650 ft.
Stephen Formation
1. Calcareous and siliceous shales 150 ft.
This shale is given the name of Ogygopsis shale from the predominating trilobite contained in it, Ogygopsis klotzi. A detailed description of this