Researchers from the Florida Museum of Natural History found that the petrified teeth of the sharks could be used more accurately with their old coastal deposits. The work published in the magazine Palaeogography, Paleoclimatology, Paleocology (PPP)It has shown that the ratio of the strontium isotopes in these fossils may be an indication of changes in the world’s coastal ecosystems.
Strontius is a chemical element naturally found in water, soil and rocks. In the oceans, isotopic rates (the same load, the same load, but different mass isotopes-atoms) have changed over time due to the destruction of the land, the activities of marine organisms and the explosions of deep sea volcanoes. This enabled scientists to form a global temporary sign that helps to determine the age of sea sedimentary rocks.
However, this method was previously complex in the application of fossils in the coastal areas where fresh water resources could affect the strncial composition. In addition, the material dated should be resistant to physical and chemical changes to maintain the initial rate of isotopes.
The researchers found that the teeth of fossil sharks have an intense enamel -like coating that protects them from chemical changes. In this way, they maintain the initial ratio of strontium isotopes and serve as reliable markers of the age of ancient beds. An additional advantage is that sharks exist for 400 million years and drop thousands of teeth in their lives. This makes its teeth one of the most common fossil materials.
In a new study, scientists analyzed the teeth of the sharks of the two keys in Florida regarding the Neogene period (2.6-23.5 million years ago). Previously, these two sites at the same age-Montbrook and Palmetto Fauna were believed to have switched to spring. However, the new analysis showed that they were different for about 600 thousand years.
The result not only determined the age of your age, but also gave new data about the events that took place in North America 5-6 million years ago. For example, in the old part of Montbrook (5.85 million years), they do not have giant laziness, they already appear in a younger part of Palmetto (5.22 million years). This shows that Lenivans’s migration from South America to north took place in this period – during the great mesmeric change caused by the formation of Panama isthmus.
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Source: Gazeta

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