The outcrops of the Tudela Formation, Lower Miocene (Ramblian), in the Bardenas Reales of Navarra (western area of the Ebro Basin) are very rich on vertebrate remains (fishes, amphibians, reptiles, birds and mammals), gastropods and microfauna of ostracodes and charas. Lithologies are composed by silts, marls and limestones, with sporadic levels of sandstones, deposited in a distal alluvial and lacustrine environment. Ostracode assemblages that have been studied from nine sections of this formation, show a dominance of the genera Nannocandona, Heterocypris, lIyocypris and limnocytherids, which are characteristics of a shallow lacustrifle environment, with fresh to oligohalyne and vegetated waters. The analysis of the assemblages, salinity and other ecologic ranges of these ostracode faunas allow to differentiate two phases in the lake evolution: the first phase (biozone Z, Daams and Freudenthal, 1989) with a fresh water, carbonated and warm climate lake, and a second phase (biozone «A», Daams and Freudenthal, 1989) with bicarbonated, alcaline waters in aclimate context where seasonality was more evident. The transition between both phases was marked by several euryhaline intervals, indicators of the environmental instability that affected those microfaunas during the water chemistry transition.

Marl

Biozone

Lithology

Halocline

Outcrop

Microfauna

Dominance (genetics)

Source

Cite

Citations (7)

The fossil vertebrates from Lano (Basque Country, Spain); new evidence on the composition and affinities of the Late Cretaceous continental faunas of Europe

Terra Nova (1990)

Humberto Astibia Éric Buffetaut Ángela Delgado Buscalioni Henri Cappetta Carmelo Corral

ABSTRACT A newly discovered fossil locality at Lano (Basque Country) has yielded a vertebrate assemblage of probably Maastrichtian age comprising fishes, amphibians, reptiles and mammals. It considerably enlarges our knowledge of the Late Cretaceous continental faunas of Europe, hitherto based on a much less complete record. Some taxa are recorded for the first time in Europe, and the fauna also contains the oldest known representatives of some groups (amphisbaenians, salamandrids). The Lan assemblage reveals an original fauna comprising both forms related to Asian and North American groups and elements with Gondwanan affinities.

Affinities

Assemblage (archaeology)

10.1111/j.1365-3121.1990.tb00103.x

Cite

Citations (113)

Bovidae (artiodactyla, mammalia) del mioceno medio de Tarazona de Aragon (depresión del Ebro, provincia de Zaragoza)

Estudios Geológicos (2001)

Humberto Astibia Ainara Badiola Jorge Morales Xabier Murelaga Xabier Pereda Suberbiola

Se describen restos fósiles dentarios, craneales y postcraneales pertenecientes a la familia Bovidae del yacimiento de Tarazona de Aragón.Según las características morfológicas y métricas de la dentición y los núcleos óseos, existen dos formas en este yacimiento del Mioceno medio de la Cuenca del Ebro.Una ha sido atribuida al género Eotragus y clasificada como E, aff.sansaniensis, mostrando características más derivadas que el resto de las formas ibéricas del mismo género.La otra se clasifica, provisionalmente, como aff.Tethytragus, ya que guarda similitudes con la especie ibérica Tethytragus langai y diferencias evidentes con respecto a Eotragus.Los dos taxones se diferencian netamente respecto a la talla, hipsodoncia y morfología de la dentición; sobre todo, las diferencias de desarrollo y prominencia de los estilos/

10.3989/egeol.01571-2128

Cite

Citations (4)

Mamiferos del mioceno medio de Tarazona de Aragón (Zaragoza)

Humberto Astibia Ana Victoria Mazo Jorge Morales Carmen Sesé Dolores Soria

Source

Cite

Citations (2)