Abstract

A study of the minerals of the Dresbach sandstone of western Wisconsin shows, with the exception of garnet, a relatively uniform and persistent suite of heavy minerals in all samples from outcrops. In order of abundance they consist of zircon, tourmaline, and the titanium minerals: ilmenite, leucoxene, and anatase. Garnet is common in sections along the Mississippi River, but rapidly decreases in abundance to the east, and disappears entirely from the sections east of Tunnel City and north of Leland. Rutile, brookite, staurolite, hornblende, and diopside are present only in one or two samples in very small amounts. In the well samples magnetite and pyrite predominate. The light minerals consist chiefly of quartz with some calcite, and an occasional grain of feldspar.

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