A reference work for scientists, students, and teachers in palaeontology, palaeoecology, stratigraphy, and sedimentology. The recent renaissance in the field of stratigraphy has promoted a much more thorough examination of the geologic record of particular fossil-bearing strata. The subject of palaeontological events whether sedimentographic or biological in nature, is now emerging as an important topic in earth history, particularly with regard to the temperature and nature of sedimentologic and biologic change.