1. Outcropping Tertiary units in southern Arkansas [cartographic material] Yale Public content 1982. 2016-01-07T20:49:32Z. 2016-07-13T21:10:34Z. Hosman, R. L. The Survey. English. cartographic image. Public. Arkansas, U.S., and Arkansas. Tertiary and From 2 to 65 million years ago.