Lower Jurassic Amaltheidae (Ammonitina) in North America: paleobiogeography and tectonic implications

• Published in: Canadian Journal of Earth Sciences
• Main Authors: Smith, Paul L, Tipper, Howard W, Ham, David M
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 2001
• Subjects: North Atlantic
• Online Access: http://dx.doi.org/10.1139/e01-034; http://www.nrcresearchpress.com/doi/pdf/10.1139/e01-034

The amaltheids are restricted temporally to the late Pliensbachian and geographically to the northern part of the northern hemisphere. Amaltheus stokesi is the only species that occurs in all areas of North America where amaltheids are found. The craton north of the Canada–U.S.A. border yields the m...