comes from the Krukowski Quarry, believed to be an outlier of the
Mount Simon Sandstone. This quarry is currently under study as perhaps
containing Ichnofossils of the earliest animals to venture ashore
during the Middle Cambrian. Among the different trackway fossils
found in this quarry (including Diplichnites
Protichnites is the rarest both in terms of dispersion and absolute
numbers. The sandstone slab here lacks ripples, suggesting that
the tracks were made on a sand flat well above the tide, rather
than underwater. This, in turn, suggests that the animal which made
Protichnites tracks could have been one of the Earth's first air-breathing
is a prevalent trackway fossil found worldwide, particularly in
Ordovician strata. The ichnogenus was made by a multilegged creature
with a tail (of which there are numerous possible perps) leaving
both footprints and a tail drag mark. Most likely, protichnites
were made by different animals of Paleozoic time. What creature
made the possbly first footprints on land in the Krukowski quarry?
Researchers currently are tending to favor the Euthycarcinoids
or Aglaspids, which are both enigmatic taxons.
particular specimen contains a very high density of both footprints
and tail tracks in hyporelief, and is totally natural without any
staining. Notice too, the circular tail tracks.
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