Algonkian

In geology, a group of very ancient strata lying below the Cam brian and made up of the following subdivisions: Keweenawan-Keweenan, Grand Cañon, and Llano series; Huronian-Lake Superior, Minnesota, A dir on dack, Newfoundland, etc. Algonkian time is co-ordinated with palæozoic, and the two chief subdivisions rank with Cam brian, Or do vic i an, etc., while the minor terms, Keweenan, etc., stand with Potsdam, Trenton, etc. At present Algonkian strata are everywhere fo iliferous, but the abounding and varied life of the lower Cam brian forbids the belief that Algonkian time was azoic. Doubtful specimens have been discovered.