61

sandstone dyke, with a marked platy jointing normal to its
walls. The dyke strikes east-west and dips south at an angle
of 80 degrees.

The Honna formation is about 2,000 feet thick.

Relation to the Haida Formation. The Honna conglomerate
lies conformably on the sandstones and shales of the upper
Haida; this relation between the two is seen at Lina narrows
in Skidegate inlet. Although no evidence for it has been seen,
it is possible that the Honna lies in part disconformably on the
Haida.

Relation to the Skidegate Formation. The Honna formation
is conformably overlain by the sandstones and shales of the
Skidegate formation. A contact showing the relationship is
seen about three-fourths of a mile west of Lina narrows and
elsewhere in the series structural evidence leads to the same con-
clusion.

Relation to the Tertiary Formations. Dykes of the Etheline
volcanics cutting the Honna formation have been noted and on
Mount Etheline flows of the Masset volcanics unconformably
overlie the conglomerate.

SKIDEGATE FORMATION.

Distribution. The Skidegate formation is well exposed along
the north shore of the western part of Skidegate inlet, and from
there extends inland, northward, in a roughly rectangular area
about 4 miles north and south and 3 miles east and west. It is
also exposed on the northeast side of Nose point, but has not
been found elsewhere on Graham island.

Lithology. The Skidegate formation is composed of sand-
stones and shales with concretionary bands of hard, tough,
buif-weathering, siliceous and calcareous material.

The rocks are mostly coarse to medium, cross-bedded arkoses
interbedded with black, fine shales.

Stratigraphy and Structure.

The basal beds of the Skidegate formation, as exposed on
Skidegate inlet, are feldspathic, concretionary sandstones,

1Cf. Clapp, C. H., Geol. Surv., Can., Mem. 51, p. 75.

Se ee