| 释义 |
phanerozoic, a.|ˌfænərəʊˈzəʊɪk|
[f. phanero- + Gr. ζωή life + -ic.]
1. Ecol. Describing those animals living in exposed conditions above the surface of the ground. Cf. cryptozoic a. 1.
1896A. Dendy in Natural Sci. July 8 Cryptozoic fauna imperceptibly blends with what by way of contrast may be called the ‘phanerozoic’. 1911A. Willey Convergence in Evolution iii. 23 Phanerozoic or diurnal animals are positively heliotropic. 1922Flattely & Walton Biol. of Sea-Shore i. 7 We thus have two great sub-realms: the phanerozoic and the cryptozoic.
2. Geol. (With capital initial.) Of, pertaining to, or designating the whole of the geological time since the beginning of the Cambrian period, as contrasted with the Pre-Cambrian (Cryptozoic); (so named in allusion to its abundant evidence of life). Also absol.
1930G. H. Chadwick in Bull. Geol. Soc. Amer. XLI. 48 The following classificatory scheme is offered for criticism... Phanerozoic or Phanerobiotic 45%... Cryptozoic or Cryptobiotic (Precambrian) 55%. 1958R. C. Moore Introd. Hist. Geol. (ed. 2) iv. 59/2 It is convenient also to designate the Cryptozoic rocks as Precambrian, a commonly used term indicating age older than the Cambrian Period, first division of the Paleozoic Era and of the Phanerozoic Eon. 1963Q. Jrnl. Geol. Soc. CXIX. 137 The rocks concerned range in age from 1055 to 1700 m.y. (radiometric dating), spanning more time than the whole of the Phanerozoic. 1971Nature 25 June 498/1 All stratigraphic methods of correlation..that are used for Phanerozoic rocks should be extended as far as possible in the Pre-Cambrian part of the stratigraphic column. 1974Ibid. 18 Oct. 568/2 It is no coincidence that the three faunally defined eras of Phanerozoic time, the Palaeozoic, Mesozoic and Cainozoic, are divided by these two so-called crises in the history of life. 1977A. Hallam Planet Earth 189 The later Proterozoic Grenville belt of southern Canada..is a linear belt with more similarities to the younger mountain belts of the Phanerozoic. |