Abstract
A method for dating fluctuations in abundance of Elasmobranchii based on three parameters: density of fossil teeth on the ocean floor, density of modern species, and the rate of teeth replacement in modern species is proposed. As a model event, the substitution by the blue shark Prionace glauca of sharks of the genus Isurus that dominated from the Pliocene to the Late Holocene was used. It was determined that, at various values of the aforementioned parameters, the blue shark occupied a dominant position in the eastern Pacific between 302 and 3940 years ago. It is suggested that, in case of a large amount of material in geological collections using this method, a great number of paleoreconstructions of the development and changes in the oceanic biota may be carried out.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
