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Now this muddles things up stratigraphically...



http://a-c-s.confex.com/crops/2008am/webprogram/Paper47897.html

The gist of this: the main fossil bearing units of the uppermost Chinle
(esp. the Coelophysis quarry), once thought to be Carnian (early Late
Triassic), and more recently as Norian (mid-late Late Triassic), may be late
Rhaetian (latest Late Triassic) or even earliest Hettangian.

As Bill Parker points out in his blog
(http://chinleana.blogspot.com/2008/09/tr-j-terrestrial-extinction-actually.
html), if correct this has the potential of pulling phytosaurs,
"rauisuchians", and aetosaurs (traditionally victims of the Tr/J extinction)
into the earliest J.

An appealing element of an extremely young uppermost Chinle (but keeping it
within the Tr) would make these high-diversity faunas and the high-diversity
ichnofaunas of eastern North America of the latest Triassic correlative. 

Thomas R. Holtz, Jr.
Email: tholtz@umd.edu   Phone: 301-405-4084
Office: Centreville 1216                        
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
http://www.geol.umd.edu/~tholtz/
Fax: 301-314-9661               

Faculty Director, Earth, Life & Time Program, College Park Scholars
http://www.geol.umd.edu/~jmerck/eltsite/
Fax: 301-405-0796

Mailing Address:        Thomas R. Holtz, Jr.
                        Department of Geology
                        Building 237, Room 1117
                        University of Maryland
                        College Park, MD 20742 USA