Geologica acta

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Geologica acta	5 records found	Search took 0.01 seconds.

13 p, 5.0 MB

Trace fossils from the Desejosa Formation (Schist and Greywacke Complex, Douro Group, NE Portugal) : new Cambrian age constraints / Dias da Silva, Í (Instituto Geológico y Minero de España) ; Jensen, S. (Universidad de Extremadura) ; González Clavijo, E. (Instituto Geológico y Minero de España)
Trace fossils from a new locality in the Desejosa Formation, Freixo de Espada à Cinta area, northeast Portugal, are described, including Teichichnus rectus and the first Cambrian record from Iberia of the ichnogenus Rosselia, identified as R. [...]
2014 - DOI (Digital Object Identifier)

10.1344/105.000002080
Geologica acta, Vol. 12, Núm. 2 (June 2014) , p. 109-120

Detailed record -

7 p, 1.0 MB

A potential record of a procolophonid parareptile from the Triassic of the Iberian Peninsula / Fortuny, Josep (Institut Català de Paleontologia Miquel Crusafont) ; Bolet, Arnau (Institut Català de Paleontologia Miquel Crusafont) ; Sellés, Albert G. (Institut Català de Paleontologia Miquel Crusafont) ; Galobart, Àngel (Institut Català de Paleontologia Miquel Crusafont)
Cranial and postcranial remains from the Middle Triassic of the Northeastern part of the Iberian Peninsula are reported and tentatively assigned to Procolophonidae. The finding is the first occurrence of a procolophonid parareptile in the Iberian Peninsula, representing the southernmost record of the group in Europe. [...]
2014 - DOI (Digital Object Identifier)

10.1344/105.000002079
Geologica acta, Vol. 12, Núm. 2 (June 2014) , p. 121-126

Detailed record -

9 p, 964.9 KB

European ornithomimosaurs (Dinosauria, Theropoda) : an undetected record / Allain, R. (Muséum National d'Histoire Naturelle (París, França)) ; Vullo, R. (Université Rennes) ; Le Loeuff, J. (Musée des Dinosaures (Espéraza, França)) ; Tournepiche, J. - F. (Musée d'Angoulême (Angoulême, França))
Early Cretaceous ornithomimosaurian theropod dinosaurs have been reported from various localities in Asia, whereas they remain poorly represented and extremely rare in North America, Africa and Europe. [...]
2014 - DOI (Digital Object Identifier)

10.1344/105.000002083
Geologica acta, Vol. 12, Núm. 2 (June 2014) , p. 127-135

Detailed record -

14 p, 6.0 MB

Linkages between the southern Patagonia Pre-Permian basements : new insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District / Permuy Vidal, C. (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Moreira, P. (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Guido, D. M. (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Fanning, C. M. (The Australian National University. Research School of Earth Sciences)
The Patagonian basement rocks are dominated by Precambrian to Early Paleozoic metamorphic rocks intruded by Paleozoic granitoids. Recently discovered basement rocks in the Cerro Negro District are characterized mainly by quartz-muscovite-chlorite schists; the metamorphic grade reaches greenschist facies (biotite-garnet grade) with a regional S1 schistosity subparallel to the original sedimentary structure S0 and a secondary non-penetrative S2 foliation. [...]
2014 - DOI (Digital Object Identifier)

10.1344/105.000002082
Geologica acta, Vol. 12, Núm. 2 (June 2014) , p. 137-150

Detailed record -

20 p, 5.5 MB

Petrogenesis of Miocene volcanic arc rocks over the Chilean-Pampean flat-slab segment of the Central Andes constrained by mineral chemistry / Litvak, V. D. (Instituto de Estudios Andinos Don Pablo Groeber (Buenos Aires, Argentina)) ; Poma, S. (Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (Argentina))
Miocene arc volcanism is manifested widely in the Valle del Cura-El Indio belt region (29°30'-30° South latitude), in the southern Central Andes of Argentina and Chile. The magmas that fed this volcanism are well represented by the Cerro de las Tórtolas Formation, which is divided into two volcanic episodes based on petrographic, chemical and age differences: an older basaltic-andesitic event (16-14Ma) and a younger andesitic to dacitic (13-10Ma) one. [...]
2014 - DOI (Digital Object Identifier)

10.1344/105.000002081
Geologica acta, Vol. 12, Núm. 2 (June 2014) , p. 151-170

Detailed record -

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