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3D dinosaur footprint casts in Costalomo (Lower Cretaceous, Cameros Basin, Spain).

From: Ben Creisler

A new  advance online paper:

Huerta, P., Fernández-Baldor, F. T., Farlow, J. O. and Montero, D. (2012)
Exceptional preservation processes of 3D dinosaur footprint casts in
Costalomo (Lower Cretaceous, Cameros Basin, Spain).
Terra Nova (advance online publication)
doi: 10.1111/j.1365-3121.2011.01047.x

Theropod dinosaur footprints at the Costalomo tracksite (Pinilla de
los Moros Formation, Upper Hauterivian–Lower Barremian, western
Cameros Basin, Salas de los Infantes, Burgos Province, Spain) show
unusual preservation of a previously undescribed nature. The
footprints occur as casts (positive epireliefs) at the top of a
sandstone bed and preserve exceptional details of the top of the digit
and claw morphology, and of digital interactions with the sediment
during penetration and extraction from the sediment. Footprint
formation and preservation occurred in the following stages: (1) The
dinosaur stepped on a thin (4–8 cm thick) mud layer, its foot sinking
to contact an underlying sand layer (channel fill); (2) voids left in
the cohesive mud after foot withdrawal were later filled with sand;
(3) subsequent deposition, burial and Alpine compression indurated the
muds and the sands of both the footprint casts and the underlying
channel sand layer; and (4) modern erosion exposed the footprint
casts, by removing the mud above the sandstone.