"The Mystery of Lyle and Louise"

Formalin preserved oysters. Available in pails.

Red, medium, to coarse-grained iron oxide cement; shows hematite bands.

Formalin Preserved

Gray to brown mudstone with abundant silt.

Fightly cemented, medium-to-coarse quartz grains.

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

Utah

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

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

Gray, fine-grained, massive contact rock.