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Dinosaurs made tracks where ever they went, but it was only in sediment
that they were preserved. The sediment was either continental in
origin or from very shallow coastal sediment where the dinosaurs could
wade. The moist sediment needed for preservation was present in places
such as beaches, tidal flats, lagoons, swamps, river banks, and lakes.
Since quadruped dinosaurs preferred dry, wooded areas, there prints were
preferentially destroyed. Thus, the fossil record is biased toward
the bipedal dinosaur tracks.
Size and shape
of typical tracksites. (Lockley, 1991)
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