Thursday, 26 January 2012

THE TRIASSIC PERIOD WAS........

The Triassic is a geological period which extends from about 250 to 200 million years ago. It started in the first period of the Mesozoic Era.The start and end of the Triassic are marked by major extinction events. The extinction event that closed the Triassic Period has recently been more accurately dated, but as with most older geologic periods, the rock beds that define the start and end are well identified, but the exact dates of the start and end of the period are uncertain by a few million years.

The first true mammals also evolved during the Triassic, as well as the first flying vertebrates. The vast supercontinent of Panguea existed until the mid-Triassic, after which it began to gradually rift into two separate landmasses, Laurasia to the north and Gondwana to the south. The global climate in the Triassic was mostly hot and dry, but the Earth became cooler and wetter as Pangaea drifted apart.

DIFFERENT ANIMALS THAT EXIST AT THAT PERIOD:

Terrestrial animals:





Lystrosaurus:
had only two teeth, a pair of tusk-like canines and is thought to have had a horny beak that was used for biting off pieces of vegetation. It was a heavily-built, herbivorous animal, approximately the size of a pig . The structure of its shoulders and hip joints suggest that Lystrosaurus moved with a semi-sprawling gait.

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  Proterosuchus: was a genus of crocodile,in the Early Triassic
and shared many of their modern features like long jaws, powerful neck muscles, short legs and a lengthy tail, while possessing several features unique to proterosuchids such as its hook-shaped mouth


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  Coelophysis:
was a small,carnivorous biped that lived during Late Triassic of the southwestern United State , with scattered material representing similar animals to Coelophysis found worldwide in some Late Triassic and Early Jurassic formations.
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Marine animals:



 



 

 


Tanystropheus: was a reptile belonging to the genus of prolacertiformes sauropoda who lived in the Cretaceous. He had a huge neck 3 meters long. It is believed that he used to catch fish, but due to their morphology, although it is unclear what his natural habitat
.
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Pachypleurosaurs: were primitive sauropterygian reptiles that vaguely resembled aquatic lizards, and were limited to the Triassic period. They were elongate animals, ranging in size from 20 cm to about a meter in length, with small heads, long necks, paddle-like limbs, and long deep tails.

 

DIFFERENT PLANTS THAT EXIST AT THAT PERIOD:



 



 
Glossopteris: was a woody, seed-bearing shrub or tree, some apparently reaching 30 m tall. They had a softwood interior that resembles conifers of the family Araucariaceae Seeds were borne on one side of variably branched or fused structures, and microsporangia containing pollen were borne in clusters at the tips of slender filaments. Both the seed- and pollen-bearing organs were partially fused to the leaves, or, in some cases, possibly positioned in the axils of leaves
.

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Leptocycas: was a cycad, a primitive seed plant from the late Triassic period. It was a palm-like tree with a long, woody trunk and tough leaves. It lived in warm climates. This tree was about 4.8 ft (1.5 m) tall.

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Fern:first appear in the fossil record 360 million years ago in the Carboniferous but many of the current families and species did not appear until roughly 145 million years ago in the early Cretaceous.

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HOW WAS THE TRIASSIC PERIOD?


Randy Cosme and Dimichi de Castro  4ºB
 

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