| 释义 |
Alˈgonkian, a. and n.
[Var. of next.]
1. See next.
2. Geol. An epithet designating a period between the Archæan and the Palæozoic; proterozoic. As n., this period or system of rocks (in the U.S.A.).
These rocks are a feature of the region of Lake Superior, a territory of the Algonquian Indians.
1890J. W. Powell in 10th Ann. Rep. U.S. Geol. Survey i. 20 At a recent conference of geologists..it was decided to make but one period of the Agnotozoic, and the name ‘Algonkian’ was chosen to designate that period. 1893― in 14th Ann. Rep. U.S. Geol. Survey i. 100 The chronologic series from the Algonkian up to the Cretaceous. 1893Geikie Text-bk. Geol. vi. i. §ii. 715 Another enormous succession of rocks comprised under the general name of ‘Algonkian’, but consisting of several distinct formations, separated from each other by unconformabilities. 1925J. Joly Surface-Hist. v. 80 These are probably of Algonkian age; that is, they are some of the earliest rocks in which life has been recognized. |