elizabeth l. a. deschner monique p. v. viens the triassic period
Post on 13-Dec-2015
216 Views
Preview:
TRANSCRIPT
Elizabeth L. A. DeschnerMonique P. V. Viens
The Triassic Period
Time Period The Triassic period is the first period in the
Mesozoic Era followed by the Permian and then the Jurassic period
It is a time that occurred from about 251 to 199 million years ago
Both the start and the end of the Triassic period are marked by major extinction events
The first flying vertebrates made their appearance in this period along with corals from the hexacorallia
Landforms &Continental Position
•During Triassic period, Earth’s landmass was concentrated into a supercontinent called Pangea •Remaining shores were surrounded by a world-ocean known as Panthalassa•All the deep-ocean sediments laid down during the Triassic have disappeared through subduction of oceanic plates
Climate + AtmosphereGenerally hot, dry climateForms typical red bed sandstones and
evaporitesNo evidence of glaciations near north or
south polesHighly seasonal: very hot summers and
very cold winters
PlantsON LAND PLANTS (dominant)Lycophytes, cycads,ginkgophyta, and
glossopterids Spermatophytes (seed plants)In northern hemisphere, conifers flourishedIn southern hemisphere, Glossopteris (seed
fern)MARINE PLANTS (dominant)CoralsReefs
AnimalsMARINE REPTILESSauropterygiaNauthosaursPlacodontsThalattosauriaCARNIVORESPrestosuchidaeOrnithosuchida
ePoposauridaeRaiusuchidae
HERBIVORES• Aardonyx•Dryosaurus•Gastonia•Jobaria•Minmi
Animal & Plant Extinctions The largest extinction occurred in this time
period -About 95% of all species and about
60% of the genera died out, including many marine animals (like the trilobite)
Possible causes of Permian extinction:-global cooling, volcanic eruptions, or
a decrease in the continental shelf area during the formation of Pangea
Major Distinctive EventsThere were 2 flood basalt volcanoes The flood basalt eruptions which produced
the Siberian Traps constituted one of the largest known volcanic events on Earth
The Emeishan and Siberian Traps eruptions may have caused dust clouds which would have blocked out sunlight and disrupted photosynthesis both on land and in the upper layers of the seas, causing food chains to collapse
Bibliographyhttp://en.wikipedia.org/wiki/Triassichttp://www.nature.com/nature/journal/
v283/n5750/abs/283823a0.html http://en.wikipedia.org/wiki/Permian
%E2%80%93Triassic_extinction_event
BOOM!!!!
top related