Abstract

All known trilobites from the metamorphic Arvonia Slate, Arvonia, Virginia, are described and illustrated. Eleven trilobite individuals are represented. The fauna includes one individual referred to the Order Ptychopariida, one to the Family Proetidae (?), four to the Sub-family Calymeninae, one to the genus Gravicalymene (?), one to the Family Calymenidae (?), one to the Family Pterygometopidae, and two to Order Undetermined.

The age suggested by these trilobites is Middle or Late Ordovician. This is consistent with previous determinations which were based on the whole fauna.

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