Fusulinid

About it

Spindle-shaped foraminifera about the size and shape of a grain of wheat or rice, packed by the thousand into Pennsylvanian and Permian limestones of Kansas, Oklahoma, Texas, and Nevada, and used to date them.

Type

Fossil (microfossil)

Group

Foraminifera (protist)

Colours

grey, white, cream, tan

Transparency

opaque

Periods

Carboniferous, Permian

Typical values: real specimens vary. For more, see mindat.org.