Cretáceo Inferior

Sistema/Período Série/Época Andar/Estágio Idade (Ma)
Paleogeno Paleoceno Daniano mais recente
Cretáceo Superior Maastrichtiano 66.0–72.1
Campaniano 72.1–83.6
Santoniano 83.6–86.3
Coniaciano 86.3–89.8
Turoniano 89.8–93.9
Cenomaniano 93.9–100.5
Inferior Albiano 100.5–~113.0
Aptiano ~113.0–~125.0
Barremiano ~125.0–~129.4
Hauteriviano ~129.4–~132.9
Valanginiano ~132.9–~139.8
Berriasiano ~139.8–~145.0
Jurássico Superior Titoniano mais antigo
Subdivisão do Cretáceo de acordo com a Tabela Cronoestratigráfica Internacional versão 2015/1 da Comissão Internacional sobre Estratigrafia.

Na escala de tempo geológico, o Cretáceo ou Cretácico Inferior é a época do período Cretáceo, da era Mesozoica, do éon Fanerozoico, que está compreendida entre há 145 milhões e 100,5 milhões de anos, aproximadamente. A época Cretácea Inferior sucede a época Jurássica Superior do período Jurássico de sua era e precede a época Cretácea Superior de seu período. Divide-se nas idades Berriasiana, Valanginiana, Hauteriviana, Barremiana, Aptiana e Albiana, da mais antiga para a mais recente.[1]

Foi no Cretáceo Inferior que surgiram os primeiros mamíferos placentários.

Em Portugal, o Cretácico Inferior é conhecido pela existência de plantas com flor[2] e dinossauros.[3] No Brasil, é famosa a Formação de Santana, no Ceará, no inúmeros fósseis de peixes e pterossauros.

Ver também

Referências

  1. ↑ Cohen, K. M.; Finney, S. C.; Gibbard, P. L.; Fan, J.-X. (2013; updated) The ICS International Chronostratigraphic Chart. Episodes 36: 199-204.
  2. ↑ Friis, E. M., Pedersen, K. R., & Crane, P. R. (2004). Araceae from the Early Cretaceous of Portugal: evidence on the emergence of monocotyledons.Proceedings of the National Academy of Sciences of the United States of America, 101(47), 16565-16570.
  3. ↑ Mateus, O., & Antunes, M. T. (2003). A new dinosaur tracksite in the Lower Cretaceous of Portugal. Ciências da Terra, 15(1).
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