Data from: A new solution to an old riddle: elongate dinosaur tracks explained as deep penetration of the foot, not plantigrade locomotion

The dinosaur track record features numerous examples of trackways with
elongate metatarsal marks. Such “elongate tracks” are often highly
variable and characterised by indistinct outlines and abbreviated or
missing digit impressions. Elongate dinosaur tracks are well-known from
the Paluxy River bed of Texas, where some had been interpreted as “man
tracks” by creationists due to their superficially human-like appearance.
The horizontal orientation of the metatarsal marks led to the now widely
accepted idea of a facultative plantigrade, or “flat-footed”, mode of
locomotion in a variety of dinosaurian trackmakers small to large. This
hypothesis, however, is at odds with the observation that elongate tracks
do not indicate reduced locomotion speeds and increased pace angulation
values, but instead are correlated with low anatomical fidelity. We here
interpret elongate tracks as deep penetrations of the foot in soft
sediment. Sediment may collapse above parts of the descending foot,
leaving a shallow surface track that preserves a metatarsal mark. The
length of a metatarsal mark is determined by multiple factors and is not
necessarily correlated with the length of the metatarsus. Other types of
posterior marks in dinosaur footprints, such as drag and slip marks, are
reviewed.