Functional morphology and mode of life of Mesozoic stemless crinoids

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Fossils at a glance. 2nd ed

Fossils provide a powerful tool for the study of the nearly 4–billion–year history of life, and its role in the evolution of Earth systems. They also provide important data for evolutionary studies, and contribute to our understanding of the extinction of organisms and the origins of modern biodiversity. Fossils At A Glance is written for students taking an introductory level course in paleontology. Short chapters introduce the main topics in the modern study of fossils. The most important fossil groups are discussed, from microfossils through invertebrates to vertebrates and plants, followed by a brief narrative of life on Earth

Definition and global correlation of the Santonian-Campanian boundary

Review of biostratigraphical evidence from different regions shows that criteria used by workers on various marine fossil groups to define the Santonian-Campanian boundary differ considerably in relative age and position. Probably the most widely recognizable of these criteria is the extinction of the distinctive crinoid Marsupites testudinarius (North America, Europe, Asia, North Africa, Australia), which, coincides exactly with two separate definitions of the boundary. A comparison of evidence from upper Santonian and lower Campanian successions in widely separated regions allows a series of important biostratigraphical markers to be placed in correct order. -from Author