The production of light by living organisms. The branch of geology concerned with the separation and differentiation of rock units by means of the study of the fossils they contain. Bony Fishes Fish of the class Osteichthyes, characterized by a skeleton composed of bone in addition to cartilage, gill covers, and an air bladder. Calcareous Nannofossils Fossil remains of calcareous nannoplankton. Calcareous Nannoplankton Protists that normally produce coccoliths during some phase in their life cycle.
Calcite can be white, colorless, or pale shades of gray, yellow, and blue.
Cambrian The earliest period of the Paleozoic era, spanning the time between 544 and 505 million years ago. It is named after Cambria, the Roman name for Wales, where rocks of this age were first studied. Campanian European stage of the Upper Cretaceous, spanning the time between 84 and 72 million years ago. Carboniferous A period of time in the Paleozoic era that includes the Pennsylvanian and Mississippian periods and extended from 360 to 286 million years ago. Cartilaginous Fishes Fish having a skeleton composed mostly of cartilage, as sharks and rays.