Useful english dictionary. 2012.
Proterozoic eon — noun from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms • Syn: ↑Proterozoic, ↑Proterozoic aeon • Derivationally related forms: ↑proterozoic (for: ↑Proterozoic) … Useful english dictionary
aeon — /ee euhn, ee on/, n. 1. (in Gnosticism) one of a class of powers or beings conceived as emanating from the Supreme Being and performing various functions in the operations of the universe. 2. eon. [1640 50; < LL < Gk aión space of time, age] * *… … Universalium
Proterozoic — [ˌprəʊt(ə)rə zəʊɪk] adjective Geology relating to or denoting the later part of the Precambrian aeon (between the Archaean aeon and the Cambrian period, about 2,500 to 570 million years ago), in which the earliest forms of life evolved. Origin… … English new terms dictionary
Precambrian aeon — noun the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago • Syn: ↑Precambrian, ↑Precambrian eon, ↑Precambrian period • Instance Hypernyms: ↑eon, ↑aeon • Part Meronym … Useful english dictionary
Precambrian eon — noun the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago • Syn: ↑Precambrian, ↑Precambrian aeon, ↑Precambrian period • Instance Hypernyms: ↑eon, ↑aeon • Part Meron … Useful english dictionary
Precambrian period — noun the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago • Syn: ↑Precambrian, ↑Precambrian eon, ↑Precambrian aeon • Instance Hypernyms: ↑eon, ↑aeon • Part Meronyms … Useful english dictionary
Lewisian — [lu: ɪsɪən] adjective Geology of or denoting the earlier stage of the Proterozoic aeon in NW Scotland, when the oldest rocks in Britain were deposited. Origin C19: from the island of Lewis in the Outer Hebrides (where the chief outcrops of these… … English new terms dictionary
Torridonian — [ˌtɒrɪ dəʊnɪən] adjective Geology of or denoting the later stage of the Proterozoic aeon in NW Scotland, from about 1,100 to 600 million years ago. Origin C19: from Loch Torridon, in NW Scotland, + ian … English new terms dictionary
Ediacaran — /ɛdiəˈkɛərən/ (say edeeuh kairuhn) adjective 1. relating to the geological period or a system of rocks comprising the final period of the Proterozoic aeon, extending from about 600–542 million years ago. –noun 2. the Ediacaran period or system of …
eon — /ee euhn, ee on/, n. 1. an indefinitely long period of time; age. 2. the largest division of geologic time, comprising two or more eras. 3. Astron. one billion years. Also, aeon. [see AEON] * * * I Long span of geologic time. In formal usage,… … Universalium
