paleonet TRIASSIC JURASSIC BOUNDARY

[Jean Guex <Jean.Guex@xxxxxxxxxxx>]

THOSE INTERESTED BY THE FOLLOWING PAPER (Bull.Geol.Lausanne 355, 2002)
CAN SEND AN E-MAIL TO:    Jean.Guex@igp.unil.ch

Discovery of Neophyllites (Ammonitina, Cephalopoda, Early Hettangian) in
the New York Canyon sections (Gabbs Valley Range, Nevada) and discussion of
the delta13C negative anomalies located around the Triassic-Jurassic boundary.
By Jean Guex , Annachiara Bartolini & David Taylor

Abstract.-
Several morphotypes of Neophyllites from the Odoghertyceras/Choristoceras
minutus beds of the New York Canyon (Gabbs Valley Range, Nevada) are
described for the first time. The presence of these forms in North America
allows a much better correlation of this stratigraphic interval with the
coeval beds in North-West Europe.
In addition, we discuss the age of the negative  delta 13 C anomalies
located around the Triassic-Jurassic boundary in England, Hungary and
Canada. We demonstrate that the first two are located in Rhaetian sediments
and the latter is located above the Triassic-Jurassic boundary.


Prof Jean GUEX
Institut de Geologie
BFSH 2    1015 LAUSANNE
Tel. 41.21.692 43 46
Fax  41.21.692 43 05
e-mail: jean.guex@igp.unil.ch