Sorry. That was not directed at you at all. I do think that the best way
for you to find out the answers you seek is through reading his papers and
emailing to him directly. I have been somewhat involved in his research
personally, but have not kept up with what he has done. Below are some of
his papers, and his email address is lbrand_at_ucomp@ccmail.llu.edu.
1979. Field and laboratory studies on the Coconino Sandstone (Permian)
vertebrate footprints and their paleoecological implications.
Palaeogeography, Palaeoclimatology, Palaeoecology 28:25-38.
1992. Reply: Fossil vertebrate footprints in the Coconino Sandstone
(Permian) of northern Arizona: Evidence for underwater origin. Geology
20:668-670.
1996. Variations in salamander trackways resulting from substrate
differences. Journal of Paleontology 70:1004-1010.
, and T. Tang. 1991. Fossil vertebrate footprints in the Coconino Sandstone
(Permian) of northern Arizona: Evidence for underwater origin. Geology
19:1201-1204.