Upper Cambrian gastropod
Upper Cambrian gastropod
Bellerophon p.478
Eureka, Nev.
Upper Cambrian trilobite
Upper Cambrian Trilobite
Dicellocephalus, p. 479
length 6", Minnesota

Upper Cambrian trilobite track
Upper Cambrian
Trilobite track -- 4 1/2 inch width, p. 479
New Lisbon, Wis.