FIGURE 1. The dual-gait features of theropod trackway 13 from Ardley Quarry, Oxfordshire, UK.

From the following article:

Biomechanics: Dinosaur locomotion from a new trackway

Julia J. Day, David B. Norman, Paul Upchurch and H. Philip Powell

Nature 415, 494-495(31 January 2002)

doi:10.1038/415494a

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a, Wide-gauge section; b, narrow-gauge section. Digits are numbered and footprints are identified as left (L) and right (R); ANG, pace angulation; SL, stride length.

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