Obviousness is a critical element to patentability. In essence, even if the applicant can demonstrate patentable subject matter, utility and novelty, the patent will not issue if the invention is trivial.
While the earliest C. megalodon remains were reported from late Oligocene strata, around 28 million years old, a more reliable date for the origin of the species is the early Miocene, about 23 million years ago.
Mostly during the time of dinosaurs. The first mammal-like reptiles occurred during the Permian Period, about 300 million years ago. Primitive mammals appeared in the Mesozoic Era along with dinosaurs in the Jurassic Period, about 250 million years ago. The Age of Mammals began after the extinction of the dinosaurs and beginning of the Cenozoic Era during the Quaternary Period, about 65 million years ago.