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Any fossils, including fossil shark teeth, are preserved in sedimentary rocks after falling from their mouth. [13] The sediment that the teeth were found in is used to help determine the age of the shark tooth due to the fossilization process. [15] Shark teeth are most commonly found between the Upper Cretaceous and Tertiary periods. [16]
While this is not preserved in fossils, there is always a mineral filled gap that is present in all dinosaur teeth between the cementum and the tooth socket, which infers the presence of soft tissue in life. [6] Alveolar bone - This is a type of bone that is typically spongy in appearance and forms the tooth socket itself. [6]
The species was thought to have lived 6.1 to 5.7 million years ago. Fossil remains have provided very important information regarding dental morphology. Orrorin had smaller teeth relative to body size and the enamel was thicker. [5] The upper canines contain a mesial groove which differs from both Australopithecus and Ardipithecus. [5]
Since dental apparatus comes into direct contact with the foods consumed, teeth provide direct and some of the best evidence for the diet that an individual ate in life. [18] The analysis of features on the teeth and jaws such as cavities, hypoplasias and striations can all reveal the sorts of foods that were consumed. [19]
In paleontology, denticle characteristics such as size and density (denticles per unit distance) are used to describe and classify fossilized teeth, especially those of dinosaurs. Denticles are also present on the teeth of varanoid lizards, sharks, and mammals. [1] The term is also used to describe the analogous radular teeth of mollusks. [2 ...
Palmetto Fossil Excursions, located about 25 miles northwest of Charleston, reported the dual discoveries in a Nov. 3 Facebook post, and included photos of the large, rust-colored tooth.
The fact that so many fossils of Ptychodus have been found in different regions of the world provides evidence of a distribution of species during the Albian-Turonian time. [6] The generic name Ptychodus comes from the Greek words ptychos (fold/layer) and odon (tooth), so "fold teeth" describing the shape of their crushing and grinding teeth. [11]
The teeth are symmetrical as in stegosaurs except Chungkingosaurus. Along the base of the tooth crown there is a swelling , which is seen in all other known stegosaurid teeth except Huayangosaurus. [4] The teeth have a middle ridge, with five fewer prominent ridges on either side. This is similar to the size ridges seen on Kentrosaurus. [16]
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