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The Maastrichtian of the Spanish Pyrenees
A paper from earlier this year summarizes the Maastrichtian dinosaur localities
of the Pyrenees
and the collections made that I summarized earlier in several papers of Spanish
López-Martínez, N.; Canudo, J.I.; Ardèvol, L.; Pereda Superbiola, X.;
Cuenca-Bescós, G.; Ruiz-Omeñaca, J.I.; Murelaga, X.; & Feist, M. 2001. New
correlated with Upper Maastrichtian pelagic deposits in the Spanish Pyerenees:
the dinosaur extinction pattern in Europe. _Cretaceous Research_ 22(1): 41-61.
Previously mentioned was a hadrosaur from the upper Maastrichtian Arén
Formation of Spain, of
which had been illustrated only a jugal. This is now photographed, and more
illustrated, including a block of matrix containing many semi-articulated
vertebrae, most from the
tail. The skull is primarily known from a complete left dentary and partial
left surangular with
complete coronoid process, and almost all of the articular, angular,
prearticular, and splenial
(resulting in a nearly complete lower left jaw), a partial left maxilla with
contact for the left
jugal. The skull is distinctive and recalls that of *Shantungosaurus* is the
brevity of the
orbital-postorbital region, massiveness of the dentary, and shallowness of the
dentary also recalls that of *Eolambia* and *Protohadros,* with a long tapering
contact for the
predentary. Unique, and a new species of fossil, but perhaps not a new "genus."
It is allied to
the Lambeosauridae based on relatively high crowns, a broad, elongate and
sub-predentary ramus, and comparison to *Telmatosaurus,* *Pararhabdodon,* and
Stratigraphic correlation finds that the Arén Formation is likely
Maastrichtian, spanning the
upper most levels of the Campanian and the entire Maastrichtian. The overlying
Tremp Formation is
apparently Danian (Paleocene), and includes a variety of dinosaur fossils,
mostly limited to teeth
(which are distinctly dinosaurian including ambiguous dromaeosaurid and
theropod teeth, and
sauropod and hadrosaur teeth). Eggshells are also known.
Further stratigraphic and geologic study shows that the Arén is composed of
silt and sandstones,
with basic limestone levels, indicating a deltaic environment for the most
part; the Tremp
Formation is comprised of more fluvial sandstones and alternating distinctive
Jaime A. Headden
Where the Wind Comes Sweeping Down the Pampas!!!!
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