Discovered fossil tracks determined to be
oldest known in Grand Canyon National Park
ABC, Channel 15 News, Arizona
The open access paper is:
Rowland, S.M., Caputo, M.V., and Jensen, Z.A.,
2020. Early adaptation to eolian sand dunes by
basal amniotes is documented in two Pennsylvanian
Grand Canyon trackways. PLoS ONE 15(8): e0237636.
A related paper is:
Francischini, H., Lucas, S.G., Voigt, S., Marchetti,
L., Santucci, V.L., Knight, C.L., Wood, J.R.,
Dentzien-Dias, P. and Schultz, C.L., 2020. On the
;presence of Ichniotherium in the Coconino
Sandstone (Cisuralian) of the Grand Canyon
and remarks on the occupation of deserts by
non-amniote tetrapods. PalZ, 94(1), pp.207-225.
Yours,
Paul H.