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The feeding habits of Glyptodon, based on their jaw morphology, were herbivorous.Glyptodon had an "elaboration of the osteodentine ridges in their jaw that provided an effective grinding mill, causing the food particles to be pushed and sheared through constant motion of the mandible, allowing Glyptodon to consume their dietary needs." They had a well-developed snout musculature, along with a mobile neck region that helped them secure food.After unifying the name of this genus, Owen continued working on its taxonomy. Countries such as Bolivia, Paraguay and western Uruguay have been recently discovered to have accommodated Glyptodontidae.In 1845, after analyzing the fossils of his colleagues, he named four species within the genus: G. Material previously assigned to Glyptodon in northeast Brazil has been reassigned to Glyptotherium, restricting the distribution of Glyptodon to the southern region of Brazil.Although some believed that the armor resembled that of the modern armadillo, the popular opinion was the Megatherium theory. D’Alton wrote a memoir to the Berlin Academy in 1833 comparing the extreme similarities of these mysterious fossils to that of the armadillo, that the scientific world seriously considered that the pieces of carapaces and fragments of bone could belong to some prehistoric version of Dasypus.D’Alton said that "all the peculiarities of the former [Dasypus] may be paralleled to the latter [fossil pieces]" He concluded that the fossils belonged to some prehistoric version of an armadillo.However, two osteoderms with characteristics similar to those of Glyptodon have been recently found in Sergipe state in the northeast, suggesting that both genera occurred in this region during the Pleistocene.
They settled disputes by fighting each other, much like male-to-male fighting among deer using their antlers.A man named Sellow found some carapace plates in three-foot deep clay in Uruguay four years later.That discovery only made the professors even more certain that the discoveries were of the Megatherium, since the bones of this prehistoric giant sloth were usually found in similar conditions and Cuvier had said that the genus was loricated.With its rounded, bony shell and squat limbs, it superficially resembled a turtle, and the much earlier dinosaurian ankylosaur – providing an example of the convergent evolution of unrelated lineages into similar forms.Although Darwin is said to have found the first fossils of glyptodontines (the subfamily), the first mention of the genus Glyptodon in Europe was in 1823, from the first edition of Cuvier's "Ossemens Fossiles".
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The then unnamed Glyptodon was briefly mentioned in a letter from Don Damsio Laranaga. It was about seven pounds, and maybe six or eight inches wide", as well as part of a tail.