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Cambrium

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Stromatolitha Cambria, e stratis Cyanobacteriorum composita, in civitate Novo Eboraco reperta

Cambrium[1][2] est systema stratigraphicum et periodus geologica.

Unam legis e paginis de
disserentibus

  • Quaternaria: vide supra
  • Neogenicum: vide supra
  • Palaeogenicum: vide supra
  • Kaenozoicum: vide supra
  • Mesozoicum: vide supra
  • Palaeozoicum: vide supra
  • 4000-4500 Hadaicum
  • superaeon 542-4500
Vide etiam
* Index aevorum geologicorum
* Aeva archaeologica
NB: Milliones annorum a.p. supra indicantur (e.g. 2.6 = 2 600 000 a.p.)

Divisio infima constituit tam aerae Palaeozoicae quam aeonis Phanerozoicae. Abhinc 5 410 ± 10 centies milium annorum coepit, antecessore Ediacario (periodo suprema tam aerae Neoproterozoicae quam aeonis Proterozoicae. Finem habuit abhinc 4 854 ± 19 centies milium annorum, successore Ordovicio, secundum scalam aevorum geologicorum Commissionis Internationalis Stratigraphicae.[3] Phanerozoicum, Palaeozoicum, Cambrium omnia incepta ex antiquissimis ichnofossilibus Treptichnus pedum dantur.

In quattuor series dividitur, quae ab infima ad supremam Terreneuvium, series 2, Maolingium, Furongium appellantur. In decem stadia dividitur, quae ab infimo ad supremum Fortunium, 2, 3, 4, 5, Drumium, Guzhangium, Paibium, Jiangshanium, 10 appellantur.[4]

E nomine Cambriae regionis Britannicae appellatur. Nomen Anglicum Cambrian system serierumque trium, e stratis Cambricis et Anglicis agnitae, primum anno 1835 ab Adamo Sedgwick definitum est.[5]

Notae[recensere | fontem recensere]

  1. "Cambrium": Robertus Koeppel, Praelectiones geologiae et praehistoriae pars 1 iii (Romae, 1933) p. 5 (Paginae selectae apud Google Books)
  2. Christof Kuhn, "Etymology of Geological Time Units"
  3. "International Chronostratigraphic Chart"
  4. "Internationale Chronostratigraphische Tabelle" (2017)
  5. "Professor Sedgwick then described in descending order the groups of slate rocks, as they are seen in Wales and Cumberland. To the highest he gave the name of Upper Cambrian group. ... To the next inferior group he gave the name of Middle Cambrian. ... The Lower Cambrian group occupies the S.W. coast of Cærnarvonshire" (p. 60) in A. Sedgwick, R. I. Murchison, "On the Silurian and Cambrian systems, exhibiting the order in which the older sedimentary strata succeed each other in England and Wales" sub "Notices and Abstracts of Communications to the British Association for the Advancement of Science at the Dublin meeting, August 1835" pp. 59-61, in Report of the Fifth Meeting of the British Association for the Advancement of Science, held at Dublin in 1835 (1836)

Nexus externi[recensere | fontem recensere]