CNN The true size of a gigantic prehistoric megalodon shark that ruled the oceans millions of years ago has been revealed for the first time -- and it had teeth as big as hands, and a fin as tall as a human adult. A computational reconstruction of megalodon's size and proportions at different life stages: a meter adult with 12 estimated body dimensions recorded; b 3-meter new-born; c 8-meter juvenile and d artistic reconstruction of a meter adult. Researchers at the University of Bristol, in southwestern England, and at the Swansea University, in south Wales, used mathematical calculations to work out the size of the megalodon shark from rare fossil remains of its teeth. Has the great white shark really vanished from Cape Town's waters?
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Megalodon shark teeth may hold ancient climate secrets
Giant monster Megalodon sharks lurking in our oceans: be serious
Using 4 million year old radioactive sharks' teeth, a sodium iodine scintillator and a gamma ray spectrometer, a group of Lamar University scientists believe they are on track to developing a new way to determine when Tyrannosaurus Rex walked the earth. The problem is fairly simple. Carbon dating, the most commonly known method for determining the age of organic materials, is limited to objects going back about 50, years, meaning that the age of fossils older than that can be difficult to determine, said Jim Westgate , a geology professor at Lamar University. Usually, the ages of older items are established by their proximity to minerals whose ages are known - igneous or metamorphic rock found above and below the specimen.
Megalodon teeth study shows ancient baby sharks raised in NURSERIES
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Megalodon Otodus megalodon ,    meaning "big tooth", is an extinct species of shark that lived approximately 23 to 3. However, it is now classified into the extinct family Otodontidae , which diverged from the great white shark during the Early Cretaceous. Its genus placement is still debated, authors placing it in either Carcharocles , Megaselachus , Otodus , or Procarcharodon. This is because transitional fossils have been found showing that megalodon is the final chronospecies of a lineage of giant sharks originally of the genus Otodus which evolved during the Paleocene.