"In the swamp forests, the peat surfaces have been deformed by vast numbers of dinosaur footprints [some of which he illustrates as photographs]. The footprints are depressions in the swamp peats that have been filled with flood-deposited sediment..... Peat is a water-saturated material that after compression tends to rebound to its undisturbed state. The abundance of well-defined tracks suggests that they were made just prior to the deposition of the sediment and that dinosaurs were very abundant in the swamp forests... Occasionally, tracks of three-toed dinosaurs [probably hadrosaurs], occur around the bases of the trees, and are pointed inward as though the animals were browsing on the standing vegetation.
The large numbers of well-defined, three-toed tracks and their association with trees suggest that the parent dinosaurs were gregarious herbivores. Occasionally, single trackways can be followed for considerable distances in mine entries driven parallel to the paths of the dinosaurs."
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