F100 – Richard D. Little Geology Collection

Sample ID F100 • Cabinet M

Illaenus ammericanus

6.97cm W x 2.88cm H x 6.14cm D • 82g

Sample Type	Fossil	Fossil Type	Altered hard parts		Mohs Hardness		4
Domain	Eukaryota	Kingdom	Animalia	Phylum	Arthropoda	Class	Trilobita
Order	Corynexochida	Family	Illeanidae	Genus	Illeanus	Species	Ammericanus
Distribution/Period		Widespread in North America, Mid Ordovician			Habitat	Marine habitat
Preservation	Cast	Orig. Material?	NA	Relief	Positive Relief	Mineral Comp.	Potentially a limestone that was lacquered for preservation.

Small tan-yellow internal mold, all parts visible except the underside. Large smooth head and tail. The thorax has 10 visible segments.