hall russell gerd westermann (4 risultati)

Soft Cover. Condizione: Very Good. Softcovers; light soiling of front wrap; o/w in very good condition.

Soft Cover. Condizione: Near Fine. Softcovers; in near fine condition.

Soft Cover. Condizione: Near Fine. Softcovers; in near fine condition.

Paperback. Condizione: New. Print on Demand. This book focuses on the taxonomy and correlation of new paleontological discoveries from the late Early Bajocian period (c. 170 million years ago) in western North America, and their significance within the broader context of global stratigraphy. Using data from collected specimens, the author meticulously defines genera and species, and explores the evolutionary relationships and biogeographic patterns of the ammonite faunas uncovered in these regions. By comparing and contrasting North American species with those from Europe, the author establishes the precise age of the studied strata and correlates them with the European Standard Zones. The book contributes to our understanding of the global distribution and diversity of marine life during the Early Bajocian period, making it an invaluable resource for researchers and enthusiasts interested in the paleontology and stratigraphy of the Jurassic era. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.