LATE JURASSIC
The 'Late Jurassic' (or 'Malm') Epoch of the Jurassic Period is the unit of geologic time from 161.2 ± 4.0 to 145.5 ± 4.0 million years ago, which is preserved in 'Upper Jurassic' strata.[1]
| Contents |
| Subdivisions |
| Paleogeography |
| Life |
| References |
Subdivisions
The Late Jurassic is divided into three ages, which correspond with the three (faunal) stages of Upper Jurassic rock:
| Tithonian | (150.8 ± 4.0 – 145.5 ± 4.0 Ma) |
| Kimmeridgian | (155.7 ± 4.0 – 150.8 ± 4.0 Ma) |
| Oxfordian | (161.2 ± 4.0 – 155.7 ± 4.0 Ma) |
Paleogeography
Pangaea broke up into two supercontinents, Laurasia to the north, and Gondwana to the south. The result of this break-up was the spawning of Atlantic Ocean. However, at this time, the Atlantic Ocean was relatively narrow.
Life
This period was well known for many famous types of dinosaurs:
★ Sauropods:
★
★ ''Camarasaurus''
★
★ Brachiosaurs
★
★ Diplodocids
Many smaller animals were flourishing on land:
★ Lizards
★ Early mammals
★ Very early birds (like ''Archaeopteryx'')
In the marine realm several different marine reptile groups flourished:
★ Metriorhynchid crocodiles
★ Ichthyosaurs
★ Plesiosaurs
★
★ Pliosaurs
References
★ Commentary: Usage of Stratigraphic Terminology in Papers, Illustrations, and Talks, , Donald E., Owen, Journal of Sedimentary Petrology, Reproduced here.
★ Late Jurassic — The Malm Epoch: The Acme of the Dinosaurs
This article provided by Wikipedia. To edit the contents of this article, click here for original source.
psst.. try this: add to faves

العربية
中国
Français
Deutsch
Ελληνική
हिन्दी
Italiano
日本語
Português
Русский
Español