During the Mesozoic era, what were the most abundant land vertebrates.?
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Dinosaurs were very abundant, I couldnt swear that they were the MOST abundant vertebrate.
973157
Lots. Recently there are several theropod fossils with feathers discovered in a fine-grained Chinese deposit, things like Sinosauropteryx, Caudipteryx and Beipiaosaurus (look them up on wikipedia). These are younger than the famous Archeopteryx, which has a reptilian skull, teeth, digits, claws, vertebrae, sternum, ribs, pelvis and tail, and a few bird traits like a wishbone, wings and feathers. However, older theropods and Archeopteryx have many similar skeletal features and the feathered therapods add further support to the relationship. In younger sediments than Archeopteryx, there are several fossil species with more birds-like traits, such as Sinornis and Shenzhouraptor and dozens more (wikipedia "fossil birds").
520870
fifth epoch of the Cenozoic era of geologic time
339351
This link I'll provide has a graphic of the Jurassic time period.
350633
The Elapids (the group of venomous snakes to which the cobras belong) only evolved about 15 million years ago.\n\nThe only snakes around in the Mesozoic would have been similar to the pythons and boas of today.\n\nThe largest group of living snakes, the Colubroids (which include the Elapids, vipers, sea snakes, garter snakes, king snakes, and most other groups of living snake) only evolved about 20 million years ago, making the late Cenozoic the era of highest adaptive radiation among the snakes.
855593
I would look here for your answer and/or a link that could get you your answer http://en.wikipedia.org/wiki/Vertebrate\n\nGood Luck!!!
45341
The biggest dinosaur is probably ultrasauros. We only have a few bones of this late Jurassic (140 million years ago) plant-eater from Colorado, but the bones show an animal who was six-stories high and may have weighed more than 50 tons. A four-legged plant-eating dinosaur found recently in Argentina, argentinasaurus, may have been even heavier than ultrasauros. If it was a brachiosaur like ultrauros then it probably was the biggest, but if it was a titanosaur, another kind of big plant-eater common in South America, it wouldn't have been so bulky.
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Devonian is commonly known as the age of Fish
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Describes the way that the Earths tectonic plates were positioned at the time of the Cenazoic Era.  \n\n the Cenozoic Era is when continents moved into their current positions. South america drifted away from Africa, the Atlantic Ocean widened and, late in the era, South America became attached to North America.
376586
A. Could we have real dinosaurs somewhere?\nAs ttocsewol pointed out, the biggest problem of cryptozoology is that there is not enough space to hide thousands of dinosaurs. If there are fewer, the species is quite vulnerable to extinction.\nOne exception: there is enough space in the ocean. We have just recently discovered some pretty large shark species. However, this means that the dinosaur in question has to be giving birth rather than laying eggs, much like Ichtyosaurus dis. However, marine reptiles of Mesosoic era (Plesiosaurs, Mesozaurs, Ichtyosaurs and so on) are not dinosaurs in strict sense of the word, but are distantly replated to them.\n\nB. Living descendants and relatives of dinosaurs.\nTurtles, crocodiles, lizards and other surviving reptiles are also quite removed relatives of dinosaurs. Birds, however, are direct descendants of theropod dinosaurs.\nBe careful around that chicken.
123077
Fossil means remains of plants and animals that lived on earth long age, both on land and  and in sea (marine).
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Cambrian 540-500 MYO, Ordovician 505-438 MYO, Silurian 438-408 MYO, Devonian 408-360 MYO,(age of fishes), Caboniferous 360-280 MYO, Permian280-248 MYO (age of amphibians), Triassic 248-208 MYO, Jurassic 208-146 MYO, Cretaceous 146-65 MYO, Tertiary 65-1.8 MYO, Theres a little way to remember these periods, my year 12 geology teacher taught it to me.  The first letter marks a period. Camels, Often, Sit, Down, Carefully, Perhaps, Their, Joints, Creek, Terribly. Then finally you have the age of man from 1.8 MYO to the present. This is known as the Quaternary period.\n\nThere are 3 eras, Paleozoic 540-248 MYO, Mezosoic 248-65 MYO (age of reptiles) Cenozoic 65 MYO -present (the age of mammals)
185304
you mean the triassic period? just use google image search for the pictures..there should be at least 10 pages of images show up on the search result :]
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Perhaps... the weather during the early part of the Cretaceous was warmer than today (and more uniform.)  I'm actually in the process of writing a paper exploring the possibility of hadrosaur hibernation in northern Alaska.\n\nI took a tour of a dinosaur resource center today.  The tour guide said that ability to adapt is what saved KT survivors.  Crocodiles can go months without eating.  Birds migrate.  Fish could swim to deeper water.\n\nIt is still highly debated to what caused the Cretaceous Tertiary extinction.
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The Sarcopterygii, in particular the Rhipidistian Osteolepiformes such as Panderichthys\n\nPanderichthys had a number of morphological traits which place it in the lineage which gave rise to the tetrapods:\n\n- fin bones which fit the pattern of humerus, ulna and radius (forelimb) and femur, tibia, fibula (hindlimb) seen in all tetrapods\n\n- brain case so similar to early amphibians (Icthyostegans) that it was originally classified as one\n\n- lungs and choanate nostrils, but still possessed gills as well\n\n- teeth with infolding enamel identical to the earliest tetrapods\n\n- a spiracle (which becomes modified in later tetrapods into the stirrup bone of the inner ear)
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Nothing that was fully aquatic, but penguins, puffin relatives, fulmars, ducks, and many other sea birds would have evolved by then.\n\nIf you are referring to plesiosaurs, ichthyosaurs, etc., they weren't dinosaurs and were long extinct by the time mammoths came around.
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Neanderthal period if this is spelled right. Just about the time that the Jurassic period was about to end. This is the best guess I can give you.