Real FOSSIL MOSASAUR TOOTH - Excellent Fossil - Creataceous Period (65 Million Years+) - FOSSIL DINOSAUR TOOTH - Great Gift Idea

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Mosasaurs have an interesting way of tooth replacement. Instead of a new replacement tooth pushing an old one out from the bottom, a resorption pit forms where basically the new tooth swings into its upright position from its initial horizontal position, while the old tooth is discarded. This way of tooth replacement is found in snakes, making mosasaurs their distant relatives. According to Philip J. Currie Dinosaur Museum, the movie mosasaur's movement is also inaccurate, based on a dated interpretation of Mosasaurus swimming like eels or snakes. The exact year is not fully certain due to multiple contradicting claims. An examination of existing historical evidence by Pieters et al., (2012) suggested the most accurate date would be on or around 1780. [14] More recently, Limburg newspapers reported in 2015 that Ernst Homburg discovered a Liège magazine issued in the October 1778 reporting in detail a recent discovery of the second skull. [15] a b c d Mike Everhart (May 14, 2010). " Mosasaurus hoffmanni-The First Discovery of a Mosasaur?". Oceans of Kansas. Archived from the original on September 4, 2019 . Retrieved November 6, 2019.

Glenn J. Tattersall; Cleo A. C. Leite; Colin E. Sanders; Viviana Cadena; Denis V. Andrade; Augusto S. Abe; William K. Milsom (2016). "Seasonal reproductive endothermy in tegu lizards". Science Advances. 2 (1): e1500951. Bibcode: 2016SciA....2E0951T. doi: 10.1126/sciadv.1500951. PMC 4737272. PMID 26844295.One enigmatic occurrence of Mosasaurus sp. fossils is in the Hornerstown Formation, a deposit typically dated to be from the Paleocene Danian age, which was immediately after the Maastrichtian age. The fossils were found in association with fossils of Squalicorax, Enchodus, and various ammonites within a uniquely fossil-rich bed at the base of the Hornerstown Formation known as the Main Fossiliferous Layer. This does not mean Mosasaurus and its associated fauna survived the K-Pg extinction. According to one hypothesis, the fossils may have originated from an earlier Cretaceous deposit and were reworked into the Paleocene formation during its early deposition. Evidence of reworking typically comes from fossils worn down due to further erosion during their exposure at the time of redeposition. Many of the Mosasaurus fossils from the Main Fossiliferous Layer consist of isolated bones commonly abraded and worn, but the layer also yielded better-preserved Mosasaurus remains. Another explanation suggests the Main Fossiliferous Layer is a Maastrichtian time-averaged remanié deposit, which means it originated from a Cretaceous deposit with winnowed low-sediment conditions. A third hypothesis proposes that the layer is a lag deposit of Cretaceous sediments forced out by a strong impact by a tsunami, and what remained was subsequently refilled with Cenozoic fossils. [2] See also [ edit ] Mike Everhart (March 26, 2009). "Samuel Wilson's Mosasaurus horridus". Oceans of Kansas. Archived from the original on June 2, 2021. M. maximus is a North American taxon Russell (1967) recognized as a distinct species. [38] It is now generally recognized as a junior synonym of M. hoffmannii, although some scientists maintain the taxon is a distinct species. [5] [7] The number of caudal vertebrae is not fully certain for M. conodon and M. hoffmannii. At least ten have been documented in M. conodon, while the count is completely unknown in M. hoffmannii. [11]

Mosasaurs had a body shape similar to that of modern-day monitor lizards (varanids), but were more elongated and streamlined for swimming. Their limb bones were reduced in length and their paddles were formed by webbing between their long finger and toe bones. Their tails were broad, and supplied their locomotive power. a b c d e Caitlin R. Kiernan (2002). "Stratigraphic distribution and habitat segregation of mosasaurs in the Upper Cretaceous of western and central Alabama, with a historical review of Alabama mosasaur discoveries". Journal of Vertebrate Paleontology. 22 (1): 91–103. doi: 10.1671/0272-4634(2002)022[0091:sdahso]2.0.co;2. S2CID 130280406.a b c d e Eric Mulder (2004). Maastricht Cretaceous finds and Dutch pioneers in vertebrate palaeontology. Royal Netherlands Academy of Arts and Sciences. pp.165–176. Johan Lindgren; Michael W. Caldwell; Takuya Konishi; Luis M. Chiappe (2010). "Convergent Evolution in Aquatic Tetrapods: Insights from an Exceptional Fossil Mosasaur". PLOS ONE. 5 (8): e11998. Bibcode: 2010PLoSO...511998L. doi: 10.1371/journal.pone.0011998. PMC 2918493. PMID 20711249. Tamaki Sato (2005). "A new polycotylid plesiosaur (Reptilia: Sauropterygia) from the Upper Cretaceous Bearpaw Formation in Saskatchewan, Canada". Journal of Paleontology. 79 (5): 969–980. doi: 10.1666/0022-3360(2005)079[0969:anpprs]2.0.co;2. S2CID 131128997.