Középső triász

Középső triász
(247,2 – 237 millió évvel ezelőtt)
Előző kor
Következő kor
Kora triász
Késő triász
↓
Környezeti jellemzők
(átlagos értékek az időegységen belül)
Idővonal
A triász időszak eseményei
m • v • sz
-255 —
–
-250 —
–
-245 —
–
-240 —
–
-235 —
–
-230 —
–
-225 —
–
-220 —
–
-215 —
–
-210 —
–
-205 —
–
-200 —
–
~208,5 –
201,3 ± 0,2 Ma
~227 –
~208,5 Ma
~237 –
~227 Ma
Jelen
247,2 –
~242 Ma
251,2 –
247,2 Ma
251,902 ± 0,024 –
251,2 Ma
←
1
←
2
←
3
←
4
 Mezozoikum
 Paleozoikum
1Tömeges kihalás
2Erdőalkotó fák újabb
megjelenése[1]
3A szén újabb megjelenése[2]
4Kőkorallok és elmeszesedett
szivacsok[3]
A triász eseményeinek
hozzávetőleges idővonala.
A skálán az évmilliók láthatók.

A középső triász a triász földtörténeti időszak három kora közül a középső, amely ~247,2 millió évvel ezelőtt (mya) kezdődött a kora triász kor után, és ~237 mya ért véget a késő triász kor kezdetekor.[4] Kronosztratigráfiai megfelelője a középső triász sorozat. A szakirodalomban bevett rövidítése Tr2. A középső triász során keletkezett a muschelkalk nevű litosztratigráfiai egység, az úgynevezett germán triász középső része.

Tagolása

A kort az alábbi két korszakra tagolják (a korábbitól a későbbi felé haladva):

Élővilág

A középső triászban jelentek meg az első herrerasaurusok, a dinoszauruszok egyik legősibb csoportja.

Jegyzetek

  1. ↑ McElwain, J.C., Punyasena, S.W. (2007). „Mass extinction events and the plant fossil record”. Trends in Ecology & Evolution 22 (10), 548-557. o. DOI:10.1016/j.tree.2007.09.003. 
  2. ↑ Retallack GJ Veevers JJ & Morante R (1996. január 4.). „Global coal gap between Permian–Triassic extinctions and middle Triassic recovery of peat forming plants”. GSA Bulletin 108 (2), 195–207. o. (Hozzáférés: 2007. szeptember 29.) 
  3. ↑ Payne, J.L., Lehrmann, D.J.; Wei, J.; Orchard, M.J.; Schrag, D.P.; Knoll, A.H. (2004). „Large Perturbations of the Carbon Cycle During Recovery from the End-Permian Extinction”. Science 305 (5683), 506. o. DOI:10.1126/science.1097023. 
  4. ↑ International Stratigraphic Chart. International Commission on Stratigraphy, 2020. (Hozzáférés: 2020. július 12.)


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