The Geological Society of America

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Fossil vertebrate footprints in the Coconino Sandstone (Permian) of northern Arizona: Evidence for underwater origin
Brand,Leonard R. et al.
Geology(1991),19(12):1201
http://dx.doi.org/10.1130/0091-7613(1991)019<1201:FVFITC>2.3.CO;2

The Geological Society of America
The Geological Society of America
GeoScienceWorld
GeoScienceWorld