Discover the ancient sea giants of the Miocene Calvert formation. This authoritative study presents a careful review of fossil marine mammals found in Maryland and Virginia, clarifying long‑standing questions about mysticetes and other cetaceans from the Chesapeake region. Based on a comprehensive survey of available specimens, the book revises earlier identifications and compares new, well‑preserved material to older, beach‑worn remains. It highlights what these fossils reveal about the growth, anatomy, and diversity of Calvert cetaceans, including insights into their vertebral structure and overall skeletal arrangement. Detailed discussion of mysticete fossils and their historical classifications Analysis of vertebrae, skulls, and other skeletal features used to distinguish species Context on the Calvert formations’ depositional setting and its fossil record Historical references and revised identifications for key specimens Ideal for readers with an interest in paleontology, marine mammals, and the Miocene era, this edition serves as a reference for researchers and a solid overview for curious readers alike.