The science of classification of organisms according to resemblances and differences.

A raising of sea level observed in the geological record. See regression.

The first period of the Mesozoic. Spans 251-199Ma.

A deposit formed by a turbidity current. Turbidity currents are turbid, sub-aqueous, density flows driven by gravity. They can form on slopes of less than 1 degree and can flow uphill as they can travel at 10km/s. They form when a unstable build-up of sediment is triggered to collapse due to a storm, earthquake or other triggering event.