Treatise on Invertebrate Paleontology Vol. 4, Pt. L : Mollusca 4 Ammonoidea

Boulder, CO, U.S.A.: Geological Society of America, Incorporated, 1996. Book. Fine. Hardcover. Reprint. 385 pp. The first of four volumes of revised Part L. Prepared by C. W. Wright, with sections by J. H. Calloman and M. K. Howarth. The revisions replace the original Part L, first published in 1957. Volumes 1 to 3 in the revised Part L series will follow as they are completed. They will cover such introductory material as morphology, biostratigraphy, and classification and will present diagnoses, stratigraphic ranges, and illustrations of Paleozoic to Jurassic ammonoids in traditional Treatise style. Past volumes of the Treatise dealt with taxa throughout their ranges rather than with fossils from restricted intervals of geological time. It is possible to treat the ammonoids stratigraphically because few genera from the Jurassic ranged into the Cretaceous, and all ammonoids became extinct by the end of the Cretaceous. This definitive series of volumes is the most comprehensive and authoritative body of knowledge in existence on invertebrate fossil groups. For each fossil group, these volumes describe and illustrate: morphological features, with special reference to hard parts; ontogeny; classification; geologic distribution; evolutionary trends and phylogeny; and systematic descriptions. There are a great many detailed illustrations and plates throughout the series..