"The Mystery of Lyle and Louise"

White and black bands of quartz, feldspar, and biotite; typical foliation.

Utah

Gray, fine-grained, massive contact rock.

Gray to buff, with numerous ooliths and fossil fragments.

Pink and gray bands, with biotite; shows good foliation.

Spinel group; black, dull metallic luster; common iron oxide.

Pale pink felsite, with small sanidine phenocrysts.

Light gray, fine small clasts.

Dense and massive.

Hematite-cemented quartz; orthoquartzite.