Archeozoic
noting or pertaining to the earlier half of the precambrian era, from about 5 billion to 2.5 billion years ago, during which the earliest datable rocks were formed and from which the oldest known fossil forms, blue-green algae and bacteria, have been recovered.
the archeozoic division of geologic time or the rock systems formed then.
historical examples
but how may we separate the proterozoic rocks from the archeozoic?
geology william j. miller
archeozoic , the era in which the simplest forms of life originated.
unexplored! allen chaffee
even in the archeozoic the rocks testify to a climate seemingly not greatly different from that of the average of geologic time.
climatic changes ellsworth huntington
archeozoic rocks have been studied minutely over a very small percentage of the earth’s land surface.
climatic changes ellsworth huntington
it has been estimated that archeozoic rocks appear at the surface over about one-fifth of the land area of the earth.
geology william j. miller
thus, igneous rocks distinctly predominate in the archeozoic, while stratified rocks predominate in the proterozoic.
geology william j. miller
i believe that our sun could not have been a typical nova, at least not since the archeozoic, that is for perhaps a billion years.
climatic changes ellsworth huntington
do the most ancient known rocks show that animal life existed during archeozoic time?
geology william j. miller
during the archeozoic, no evidence of glaciation has yet been discovered.
climatic changes ellsworth huntington
the early and middle proterozoic strata throw no more light upon the early history of animal life than do the archeozoic strata.
geology william j. miller
adjective
a variant spelling (esp us) of archaeozoic
archeozoic also archaeozoic
(är’kē-ə-zō’ĭk)
see archean.
Read Also:
- Archeptolemus
(in the iliad) the son of iphitus who served as a charioteer for hector.
- Archerfish
a small , toxotes jaculatrix, of brackish and fresh waters in southeastern asia, that preys upon sh-r-side spiders and insects by spitting drops of water at them and knocking them into the water. any of several closely related of the family toxotidae. noun (pl) -fish, -fishes any freshwater percoid fish of the family toxotidae of […]
- Arches
architecture. a curved masonry construction for spanning an opening, consisting of a number of wedgelike stones, bricks, or the like, set with the narrower side toward the opening in such a way that forces on the arch are transmitted as vertical or oblique stresses on either side of the opening. an upwardly curved construction, as […]
- Arches national park
a national park in e utah: natural arch formations. 114 sq. mi. (295 sq. km).
- Archespore
the primitive cell, or group of cells, that give rise to the cells from which are derived. noun (pl) -spores, -sporia (-ˈspɔːrɪə) (botany) the cell or group of cells in a sporangium that gives rise to spores