Trenton period

Tren´ton pe´ri`od

1.(Geol.) A subdivision in the lower Silurian system of America; - so named from Trenton Falls, in New York. The rocks are mostly limestones, and the period is divided into the Trenton, Utica, and Cincinnati epochs. See the Chart of Geology.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.