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Ascent of Dinosaurs Linked to an Iridium Anomaly at the Triassic-Jurassic Boundary

Paul E. Olsen; Dennis V. Kent; Alessandro Montanari; Emma C. Rainforth; Heinz Huber; Sarah J. Fowell; Hans-Dieter Sues; Christian Koeberl; Michael J. Szajna; Brian W. Hartline

Title:
Ascent of Dinosaurs Linked to an Iridium Anomaly at the Triassic-Jurassic Boundary
Author(s):
Olsen, Paul E.
Kent, Dennis V.
Montanari, Alessandro
Rainforth, Emma C.
Huber, Heinz
Fowell, Sarah J.
Sues, Hans-Dieter
Koeberl, Christian
Szajna, Michael J.
Hartline, Brian W.
Date:
Type:
Articles
Department:
Lamont-Doherty Earth Observatory
Volume:
296
Permanent URL:
Book/Journal Title:
Science
Abstract:
Analysis of tetrapod footprints and skeletal material from more than 70 localities in eastern North America shows that large theropod dinosaurs appeared less than 10,000 years after the Triassic-Jurassic boundary and less than 30,000 years after the last Triassic taxa, synchronous with a terrestrial mass extinction. This extraordinary turnover is associated with an iridium anomaly (up to 285 parts per trillion, with an average maximum of 141 parts per trillion) and a fern spore spike, suggesting that a bolide impact was the cause. Eastern North American dinosaurian diversity reached a stable maximum less than 100,000 years after the boundary, marking the establishment of dinosaur-dominated communities that prevailed for the next 135 million years.
Subject(s):
Paleontology
Publisher DOI:
http://dx.doi.org/10.1126/science.1065522
Item views:
118
Metadata:
text | xml

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