Algonkian

Two important ones, however—namely, Archean and Algonkian—are of American birth.

As shown in Figure 207, a strong unconformity (nm´, Fig. 207) parts the schists and the Algonkian.

These diverse forms indicate that before the Algonkian had closed, life was abundant and had widely differentiated.

The vast length of Algonkian time is shown by the thickness of its marine deposits and by the cycles of erosion which it includes.

The pottery of the Iroquoian and Algonkian tribes of the north-east was, as a rule, rather crude and undeveloped.