Probable crocodilian tracks and traces from the Morrison Formation (Upper Jurassic) of eastern Utah
作者:
JohnR. Foster,
MartinG. Lockley,
期刊:
Ichnos
(Taylor Available online 1997)
卷期:
Volume 5,
issue 2
页码: 121-129
ISSN:1042-0940
年代: 1997
DOI:10.1080/10420949709386411
出版商: Taylor & Francis Group
关键词: Tracks;Morrison Formation;Jurassic;crocodilian
数据来源: Taylor
摘要:
A tetradactyl pes impression and tridactyl manus impression are described as the type specimen ofHatcherichnus sanjuanensisichnogen. et ichnosp. nov., a probable large crocodilian ichnite from the Salt Wash Member of the Upper Jurassic Morrison Formation in eastern Utah. A similar pes track from the Morrison Formation at Garden Park, Colorado, may also belong to this ichnogenus. The type specimen from Utah consists of plaster replicas of natural casts of a left pes impression and a left manus impression. Associated with the type specimen were possible tail and body drag impressions. The tracks do not appear to be part of a walking trackway and may be swim tracks associated with an animal in shallow water. The tracks occur at a visible contact between slightly fining‐upward channel sandstone units.
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