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Chirotherium stuff



From: Ben Creisler
bh480@scn.org


A few recent items about archosaur tracks called Chirotherium:

Hendrik Klein, Sebastian Voigt, Hafid Saber, Jörg W. Schneider, Abdelkbir
Hminna, Jan Fischer, Abdelouahed Lagnaoui and Andreas Brosig (2011)
First occurrence of a Middle Triassic tetrapod ichnofauna from the Argana
Basin (Western High Atlas, Morocco) 
Palaeogeography, Palaeoclimatology, Palaeoecology (advance online
publication)
doi:10.1016/j.palaeo.2011.05.021
http://www.sciencedirect.com/science/article/pii/S0031018211002665

Abstract
Footprints of Early Mesozoic terrestrial tetrapods are inadequately known
from NW Africa despite pervasive and well-exposed continental strata of
corresponding age in that region. Here, we report on the first occurrence
of a tetrapod ichnofauna from the middle part of the Triassic
Timezgadiouine Formation in the Argana Basin, Central Morocco that is
outstanding in terms of abundance, preservation, and diversity. Footprints
of this assemblage are assigned to the ichnotaxa Chirotherium barthii,
Isochirotherium coureli, Synaptichnium isp., Atreipus?Grallator,
Rotodactylus isp., Rhynchosauroides isp., and Procolophonichnium isp.,
suggesting early archosaurian, dinosauromorph, lepidosauromorph and
possible therapsid or procolophonoid trackmakers. Based on comparison with
the abundant record of Early Mesozoic vertebrate ichnofossils from Europe
and North America, the ichnofauna presented here indicates a Middle
Triassic (Anisian?Ladinian) age for the track-bearing horizon in the Argana
Basin. Its clearly Euramerican affinity sheds light on the migration and
dispersal of early archosaur-dominated tetrapod faunas considering that
several ichnotaxa of the assemblage are documented from Africa for the
first time.

Note that a similar paper came out last year in Ichnos:

http://www.informaworld.com/smpp/content~db=all~content=a926945613~frm=title
link?

===
Chirotherium tracks in Germany
A major winter storm named Kyrill back in 2007 uprooted trees in a wooded
area near the village of Bad Kissengen in Bavaria (southern Germany), and
revealed archosaurian Chirotherium tracks from the Triassic preserved in
sandstone. The site was recently designated an official Geotop (preserved
site with geological significance) and is now open to the public to view.
These links go to recent news stories in German, which unfortunately use
the term "dinosaur" inaccurately for the animals in a few places. The video
interview with Dr. Roland Eichhorn mentions some amusing confusion about
the tracks among early geologists, including the idea that smaller tracks
from the forefeet were made by a different animal from the larger hind
tracks.

with videos and photos:
http://www.br-online.de/bayern1/mittags-in-mainfranken/frankenmagazin-euerdo
rf-dinosaurier-ID1307094608712.xml

text only:
http://www.mainpost.de/regional/bad-kissingen/Auf-den-Spuren-der-Saurier;art
770,6177714


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