"Avantor"

Fightly cemented, medium-to-coarse quartz grains.

Light gray, with flow structure.

Gray, fine to medium-grained “Berea grit”.

Hematite-cemented quartz; orthoquartzite.

Foliated biotite, coarse, silvery gray with quartz-feldspar bands.

Typical green-gray, fissile, clay-rich.

Brownish gray, kerogen-rich; commercial oil source.

Slaty cleavage; contains hematite.

Chlorite-mica with perfect slaty cleavage.

White, very dark green, and very dark red to light red granoblastic intergrowth of wollastonite, diopside, and andradite.

Survey of Major Life Forms in the Fossil Record

Eight High-Quality Fossils for Introductory Classes

Millions of Years of the Earth’s History in Fossil Form

Classroom Survey Set Ideal for General and Earth Science Classes

View minute, fossilized life forms

An excellent introduction to the Stratigraphic Record.