Possible Microfossils found in the Roraima Formation in British Guiana

Abstract

AFTER many years of speculation the Roraima Formation of British Guiana has now been found by McDougall et al.¹ and Snelling² to be not younger than Lower Proterozoic. The Formation is, therefore, of considerably greater antiquity than had been supposed and, in consequence, there is heightened interest in presumed microfossils which have been recently discovered in it. The tabular Roraima Formation has a total thickness in British Guiana in excess of 7,000 ft. (ref. 3) and consists of generally horizontal, dominantly arenaceous sediments. It forms the Pakaraima Mountains of the mid-western region of the country and also extends over considerable adjacent areas in Venezuela and Brazil, covering some 175,000 square miles in all.