A new Isochirotherium trackway from the Triassic of Vieux Emosson, SW Switzerland: stratigraphic implications |
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Authors: | Marco Avanzini Lionel Cavin |
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Institution: | (1) Dinosaur Tracks Museum, University of Colorado at Denver, Denver, CO 80217, USA;(2) Qingdao Institute of Marine Geology, China Geological Survey, Qingdao, 266071, People’s Republic of China;(3) Science Department, Dixie State College, 225 South 700 East, St. George, UT 84770, USA;(4) Department of Environmental Sciences, Tokyo Gakugei University, Koganei Tokyo, 184-8501, Japan;(5) Fourth Geological and Mineral Resources Survey of Shandong, Wei-fang, 261021, People’s Republic of China |
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Abstract: | The footprint assemblage of Vieux Emosson, located at 2400 m altitude in the Swiss Alps, was first described in 1982. The
assemblage was regarded as Late Ladinian or Carnian in age, but the dating was questioned because the taxa show few affinities
with other Triassic assemblages. Here we describe a short trackway with shallow but well-preserved tracks referred to the
ichnogenus Isochirotherium, showing affinities with Isochirotherium soergeli and Isochirotherium lomasi. The trackway is present on a piece of slab ex situ lying on a mass of fallen rocks, but the slab can be attributed with confidence to the same level as the main one previously
mapped. Preliminary observations in situ and of the footprint casts made in 1979 and deposited in the Natural History Museum of Geneva suggest that none of these
are attributable to dinosaurs and that the Vieux Emosson footprints are mainly “track preservation variations” of chirotherian
tracks. The occurrence of the ichnogenus Isochirotherium favours an older age, probably Early or Middle Triassic, than previously suggested for the Vieux Emosson tracksite. |
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