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Two new publications on dinosaur tracks in the last issue of the Spanish journal ZUBIA



Both in Spanish, with English abstract

 Alvarez Bermejo, J.M., O. Argaiz Gil, I. Diaz-Martinez, I. Eguiluz
Garcia, M. Herreros Martinez, J. Lucas Lopez, C. Martinez Garcia, J.
Martinez Perez, A. Perez Llanos, F. Perez-Lorente & P. Vega Garcia.
2013. El yacimiento paleoicnologico de Guilera. Redescubrimiento,
situacion, definicion y analisis de sus icnitas  [The Guilera
tracksite; rediscovery, location, and ichnology]. Zubia, 31: 199-210.

Abstract: In this work the called Guilera tracksite from Enciso Group
(Lower Cretaceous) is located and studied. The tracksite is near
Enciso village and was first cited by Casanovas and Santafe (1974).
These researchers identified two dinosaur footprints and located the
tracksite on the Guilera hillside. Here we describe the metric and
morphological features of a set of footprints and trackways found in
two outcrops (1GI and 2GI).There are 36 footprints distributed in 3
trakways (2 in 1GI and 1 in 2GI) in addition to several other isolated
footprints. All of them are impressed at the top of the same layer.
The studied footprints are large (50 cm of length), trydactil and have
a rounded phalangeal pad on each digit and other in the
metatarsophalangeal area (heel pad). They are classified as large
ornithopod footprints and are compared with other similar specimens
found in La Rioja and worldwide. In addition, the Guilera site has
been used to check previously published hypothesis inferred from
ornithopod footprints in other localities, such as velocity and
relative hindlimb width calculations, and the groupings (presence of
groupings) of ornithopod footprints. Special detail has been used in
the comparisons with the La Rioja fossil footprint record, where
ornithopod footprints are exceptionally frequent, in contrast to the
rest of the European record. Therefore, the study of this rediscovery
tracksite is valued as important when taking into account the amount
of ornithopod footprint papers, or the knowledge of dinosaur
ichnology.

Key words: Guilera tracksite, large ornithopod footprints, Enciso
Group, Lower Cretaceous, La Rioja.
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Perez-Lorente, F. 2013. Las huellas de dinosaurio mas modernas de
Enciso (La Rioja, Espana). Yacimiento de Las Riscas [The latest
dinosaur footprints of Enciso (La Rioja, Spain). Las Riscas site].
Zubia, 31: 211-222.

Abstract: The latest tracksite found near Enciso is described in this
paper. The layer with the footprints belongs to the higgest
stratigraphic unit of the Enciso Group very close to the Olivan Group
base. Thereby it is associated to the upper part of Lower Cretaceous
(Aptian or Albian). In this paper the Enciso Group is divided into
three litostratigraphic units, where the surrounding tracksites of
Enciso are located. As the Olivan Group base is erosive, the position
of the layer are not very clear. The tracksite has a small and chaotic
group of the same ichnotype footprints. This fact is found in other
sites of Cameros Basin.

Keywords: Lower Cretaceous, footprints, dinosaurs, Enciso Group, La Rioja.
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Issues 1 to 28 (1983-2010) of Zubia are free in the web:
http://dialnet.unirioja.es/servlet/revista?codigo=1493
I suppose that number 31 will be online sometime.

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Jose Ignacio Ruiz-Omenaca
Museo del Jurasico de Asturias (MUJA)
E-33328 Colunga, Spain
www.dinoastur.com
www.museojurasicoasturias.com
www.aragosaurus.com
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