The main strengths of the palaeontology are the marine Cretaceous and Tertiary of Kent, especially Chalk, Lower Greensand and Lenham Beds; but also Gault and London Clay.
Paleontologists are most successful in studying fossils from the marine Cretaceous and Tertiary periods in Kent, with particular emphasis on the Chalk, Lower Greensand, and Lenham Beds. The Gault and London Clay are also important for paleontological research.