I am now satisfied that the entire Armuchee with lithologically fauna is the equivalent is of Laramie age and is the equivalent of the Camden chert of eastern Tennessee. Besides the six species collected by Brooks I must have at least ten more. Among these are Amphithoea flatellata (my em.), Pleinpu mar murchisoni, Pentajonia pro Clarkes species, Trematopria multistriata, Shepherdella orichalcus Platyistoma recticornis, Lep. adibrudalis, Arctos the tumid Camden form, Amphia nucliea, etc. The Rockwood here is not later than Clinton since in it I found near the top the Amphitheon. Below the Rockwood are heavy beds of quartzite and then very fine sandy shales and sandstones, the same sequence as at the north. There is here therefore a land interval from the beginning of Proterozoic to the close of the Heldebyrian. The land interval after the Chattanooga