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Re: New papers: Kentrosaurus lectotype and dino tracks

So it is finally out..... there apparently was a problem with
IntegaConnect, the paper was supposed to be available online in late
2010. Apologies to all who already cited it with that year (e.g., in
the SJG stegosaur volume).


On Wed, Feb 2, 2011 at 10:43 AM,  <bh480@scn.org> wrote:
> From: Ben Creisler
> bh480@scn.org
> In case these recent papers have not been mentioned yet:
> Mallison, Heinrich (2011)
> The real lectotype of Kentrosaurus aethiopicus Hennig,
> 1915.
> Neues Jahrbuch für Geologie und Paläontologie -
> Abhandlungen 259 (2): 197-206 (February 2011)
> DOI: 10.1127/0077-7749/2011/0114
> http://www.ingentaconnect.com/content/schweiz/njbgeol/2011
> /00000259/00000002/art00004
> A detailed study of the relevant literature reveals that
> contra recent use the lectotype of the stegosaur
> Kentrosaurus aethiopicus Hennig, 1915 is a partial
> individual from excavation 'St' at Kindope, Tendaguru,
> Tanzania in the collection of the Museum für Naturkunde
> Berlin (MB. R.4800.1-37). This significantly influences
> the diagnosis of the taxon, defining several characters
> based on the lectotype instead of referred specimens,
> notably the sub-vertical neural spines of the medial
> third of the tail, and the hook-shaped, anteriorly
> inclined neural spines in the posterior caudals.
> ===
> P. L. Falkingham, K. T. Bates, L. Margetts and P. L.
> Manning (2011)
> The ‘Goldilocks’ effect: preservation bias in vertebrate
> track assemblages.
> Journal of the Royal Society Interface (advance online
> publication)
> doi: 10.1098/&#8203;rsif.2010.0634
> FREE PDF at:
> http://rsif.royalsocietypublishing.org/content/early/2011/
> 01/12/rsif.2010.0634.abstract
> Finite-element analysis was used to investigate the
> extent of bias in the ichnological fossil record
> attributable to body mass. Virtual tracks were simulated
> for four dinosaur taxa of different sizes (Struthiomimus,
> Tyrannosaurus, Brachiosaurus and Edmontosaurus), in a
> range of substrate conditions. Outlines of autopodia were
> generated based upon osteology and published soft-tissue
> reconstructions. Loads were applied vertically to the
> feet equivalent to the weight of the animal, and
> distributed accordingly to fore- and hindlimbs where
> relevant. Ideal, semi-infinite elastic–plastic substrates
> displayed a ‘Goldilocks’ quality where only a narrow
> range of loads could produce tracks, given that small
> animals failed to indent the substrate, and larger
> animals would be unable to traverse the area without
> becoming mired. If a firm subsurface layer is assumed, a
> more complete assemblage is possible, though there is a
> strong bias towards larger, heavier animals. The depths
> of fossil tracks within an assemblage may indicate
> thicknesses of mechanically distinct substrate layers at
> the time of track formation, even when the lithified
> strata appear compositionally homogeneous. This work
> increases the effectiveness of using vertebrate tracks as
> palaeoenvironmental indicators in terms of inferring
> substrate conditions at the time of track formation.
> Additionally, simulated undertracks are examined, and it
> is shown that complex deformation beneath the foot may
> not be indicative of limb kinematics as has been
> previously interpreted, but instead ridges and
> undulations at the base of a track may be a function of
> sediment displacement vectors and pedal morphology.
> ====
> Also of interest:
> For French readers, there are news story about a new
> theropod found in Aix-en-Provence (a region famous for
> fossil dino eggs) in southern France. It's not been named
> yet, but it's based on part of a skull, described as up
> to 6 meters long in total length, and about 70 million
> years old.
> http://www.citylocalnews.com/aix/2011/02/01/un-nouveau-
> dino-decouvert
> http://www.maxisciences.com/dinosaure/une-nouvelle-espece-
> de-dinosaure-decouverte-a-aix-en-provence_art12277.html