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German Early Cretaceous Oberkirchen dinosaur tracksites (free pdf!)



From: Ben Creisler
bcreisler@gmail.com

A new onlin paper. The pdf is free!

Jahn J. Hornung, Annina Böhme, Torsten van der Lubbe, Mike Reich and
Annette Richter (2012)
Vertebrate tracksites in the Obernkirchen Sandstone (late Berriasian,
Early Cretaceous) of northwest Germany— their stratigraphical,
palaeogeographical, palaeoecological, and historical context.
Paläontologische Zeitschrift (advance online publication)
DOI: 10.1007/s12542-012-0131-7
http://www.springerlink.com/content/24115q7400764179/

FREE PDF:
http://www.springerlink.com/content/24115q7400764179/fulltext.pdf


The northern German Lower Cretaceous Bückeberg Formation yields
numerous dinosaur tracksites, some of which have produced material of
impressive quality. Stratigraphically, the localities are concentrated
in the Obernkirchen Sandstone, a thin subunit within this formation.
The Obernkirchen Sandstone represents mainly a sandy barrier to
back-barrier and lagoonal setting within a limnic deltaic facies
complex, which was deposited during the late Berriasian (Cypridea alta
formosa ostracod subzone) in the southeast of the Lower Saxony Basin,
northwest Germany. A few tracksites occur more proximally in coeval
fluvial deposits. Dinosaur footprint assemblages were left by
ornithopods, theropods, sauropods, ankylosaurs, and small, bipedal
ornithischians. Other vertebrate tracks are those of turtles and,
possibly, crocodilians. Due to the decrease in sandstone quarrying in
recent decades, many old tracksites are inaccessible today.
Additionally, historical descriptions of the tracks were of highly
variable quality and often published in remote and today nearly
unobtainable sources. Here we provide a catalogue of 13 tracksites
compiled from the literature and some new observations. Of these 13
tracksites, only five are still accessible and currently under study.
Descriptions of each locality are provided, with a comprehensive
compilation of existing data on lithofacies, stratigraphy,
palaeogeography and palaeoecology of the Obernkirchen Sandstone and
equivalent strata. A short review of the track-bearing lithofacies
assemblage indicates that the outcrop areas have distinctly different
facies and environments, and, therefore, track-bearing horizons can
only be correlated stratigraphically between adjacent outcrops. For
this reason, the identification of a megatracksite in the Obernkirchen
Sandstone is currently regarded as premature and uncertain.