About 19 million years ago there was a mass extinction of sharks in the world’s oceans.
This fact was established by scientists at Yale University, when they studied fish teeth and shark scales up to 85 million years old, taken from deep-sea sediments. In studying them to understand the normal variability of this population, they discovered a sudden decline in shark numbers about 19 million years ago.
According to them, about 70 percent of all sharks on the planet went extinct. It is noted that at that time there were 10 times more sharks in the ocean than there are now. However, the cause of extinction is still unknown. Scientists have no information about any climatic disasters or damage to the ecosystem at that time. What is known is that most sharks died in the open ocean and not in coastal waters.
Given the current decline in shark populations, evidence of such a long-standing extinction is troubling to scientists. It remains to be seen what consequences might follow the dramatic decline of these marine predators in modern times.
In November, Spanish paleontologists explained the possible cause of the extinction of the largest prehistoric sharks in Earth history some three million years ago. A cooling climate caused sea levels to drop, leaving fewer coastal areas suitable for their cubs to mature.