The Jurassic is a geologic period and system that spanned 56 million years from the end of the Triassic Period 201.3 million years ago (Mya) to the beginning of the Cretaceous Period 145 Mya. (https://en.wikipedia.org/wiki/Jurassic)
Micropalaeontology is the branch of paleontology (palaeontology) that studies microfossils, or fossils that require the use of a microscope to see the organism, its morphology and its characteristic details. (https://en.wikipedia.org/wiki/Micropaleontology)
