1.
Science
; 328(5981): 973; author reply 975-6, 2010 May 21.
Artículo
en Inglés
| MEDLINE
| ID: mdl-20489004
Asunto(s)
Extinción Biológica , Planetas Menores , Animales , Cambio Climático , Fenómenos Geológicos , México , Agua de Mar , Vertebrados , Erupciones Volcánicas
2.
Science
; 317(5836): 358-61, 2007 Jul 20.
Artículo
en Inglés
| MEDLINE
| ID: mdl-17641198
RESUMEN
It has generally been thought that the first dinosaurs quickly replaced more archaic Late Triassic faunas, either by outcompeting them or when the more archaic faunas suddenly became extinct. Fossils from the Hayden Quarry, in the Upper Triassic Chinle Formation of New Mexico, and an analysis of other regional Upper Triassic assemblages instead imply that the transition was gradual. Some dinosaur relatives preserved in this Chinle assemblage belong to groups previously known only from the Middle and lowermost Upper Triassic outside North America. Thus, the transition may have extended for 15 to 20 million years and was probably diachronous at different paleolatitudes.