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More trackway questions...
With all this talk going on about dinosaur trackways and running speed these
days, I decided to check out one of the latest papers written on the
Day, J. J., D. B. Norman, P. Upchurch, and H. P. Powell. 2002. Dinosaur
locomotion from a new trackway. Nature 415: 494-495.
In it, the author's state, "This [zig-zag] pattern contrasts strongly with
the more usual narrow-gauge form of theropod trackway in which
pace-angulation values range between 160 degrees and 170 degrees: the
hind-foot impressions are located close to the midline of the trackway."
Now, I've always read that most recovered dinosaur trackways indicate
animals walking at moderately slow speeds, as evidenced by the relatively
smaller pace lengths and pace angulations. But according to this paper,
trackways in which the foot prints are left close to the midline are most
common, which, as I understand it, indicates a speedy animal.
What's the deal?
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