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RE: Dinosaur tail traces.review

I'm intriqued by that last line [haven't seen the paper yet]..
(TDI's) "as a reflection of behavior". 

Would this possibly be referring to a more upright stance for
bipedal dinosaurs ?? Just asking ..

> Date: Tue, 3 Sep 2013 19:57:47 -0700
> From: bcreisler@gmail.com
> To: dinosaur@usc.edu
> Subject: Dinosaur tail traces.review
> from: Ben Creisler
> bcreisler@gmail.com
> A new paper:
> Jeong Yul Kim & Martin G. Lockley (2013)
> Review of Dinosaur Tail Traces.
> Ichnos 20(3):129-141
> DOI:10.1080/10420940.2013.817405
> http://www.tandfonline.com/doi/full/10.1080/10420940.2013.817405#.Uiaghja1EYE
> Since 1858, when Hitchcock first recorded dinosaur tail traces from
> the Jurassic of Massachusetts, USA, a number of dinosaur tail traces
> have been reported. Although considered rare, at least 38 records of
> dinosaur tail traces have previously been reported in the literature.
> These occurrences are herein reviewed in order to understand their
> geographic and stratigraphic distribution, types of tail trace makers,
> and characteristics of dinosaur tail traces. Several terms for
> dinosaur tail traces have been employed and they are divided into tail
> impressions (TIs) for resting traces, and tail drag impressions (TDIs)
> for locomotion traces. Possible criteria for distinguishing, measuring
> and comparing TIs and TDIs are suggested. In addition, herringbone
> structures, one of the characteristic features of tail traces
> associated with ornithopod and theropod tracks, are discussed.
> Estimated speeds of tail trace makers are shown to be rather low.
> Finally, the abundance of tail traces associated with bipedal, rather
> than quadrupedal, dinosaurs is considered a reflection of behavior.