Everything about The Middle Jurassic totally explained
The
Middle Jurassic, called the
Dogger in the European system of classification, is the second epoch of the
Jurassic Period. It lasted from 176-161
million years ago.
Paleogeography
Pangaea began to separate into
Laurasia and
Gondwana and the
Atlantic Ocean formed. Tectonic activities are active on eastern Laurasia as the
Cimmerian plate continues to collide with Laurasia's southern coast, completely closing the
Paleo-Tethys Ocean. A
subduction zone on the coast of western North America continues to create the
Ancestral Rocky Mountains.
Life
Marine life
During this time, marine life (including
ammonites and
bivalves) flourished.
Ichthyosaurs, although common, are reduced in diversity, while the top marine predators, the
pliosaurs, grew to the size of
killer whales and larger (
Pliosaurus,
Liopleurodon). Plesiosaurs also became common at this time.
Terrestrial life
New types of
dinosaurs evolved on land (including
Cetiosaurs,
brachiosaurs,
megalosaurs and
hypsilophodonts).
Descendants of the
therapsids, the
cynodonts were still flourishing along with the dinosaurs even though they were
shrew-sized; none exceeded the size of a
badger. A group of cynodonts, the
Trithelodonts were becoming rare and eventually became extinct at the end of this epoch. The Tritylodonts were still common though.
Mammaliformes, who evolved from a group of cynodonts were also rare and less significant at this time. It was at this epoch that the "true"
mammals evolved.
Flora
Conifers were dominant in the Middle Jurassic. Other
plants, such as
ginkgoes,
cycads, and
ferns were also common.
Further Information
Get more info on 'Middle Jurassic'.
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