Crossword-Solution: ARCHEAN 7 letters, 2 clues 🏆 scrabble score: 12

Paleozoic Forest In consequence of this imperfect record we can not, as yet, trace a gradual successive growth from the low forms of animal and plant life, that characterized the closing period of Archean time, to the highly organized types of the present.

THE ALGONKIAN In some regions there rests unconformably on the Archean an immense body of stratified rocks, thousands and in places even scores of thousands of feet thick, known as the ALGONKIAN.

The lowest member is a basal conglomerate composed of pebbles derived from the erosion of the dark crumpled schists beneath,--schists which are supposed to be Archean.

The floor on which the Algonkian rests is remarkably even, and here again is proved an interval of incalculable length, during which an ancient land mass of Archean rocks was baseleveled before it received the cover of the sediments of the later age.

Great unconformities, UU' separate the Algonkian both from the Archean and from the Cambrian, and divide it into three distinct systems, --the LOWER HURONIAN, the UPPER HURONIAN, and the KEWEENAWAN.