Arkosic Graywacke

Title

Arkosic Graywacke

Alternative Title

Sandstone

Identifier

FR-10

Description

Coarse sand grains made of quartz, surrounded by smaller feldspar grains. Greenish blue surface color, minimal surface weathering.

(Thin section FOV: 1.28)

Date

Not given

Contributor

Western Minerals, Inc.

Is Part Of

Stratigraphic Suite- Franciscan Rocks, California

Spatial Coverage

Quarry face at back of parking lot of Castle Lanes Bowling Center on Geneva Ave. (near the Cow palace) on the north side of San Bruno Mountain.

Temporal Coverage

Mesozoic

Accrual Method

Purchased from Western Minerals, Inc.