In Memoriam: Florencio Aldaya Valverde (1941-1995). Stvd.Geol. Salmant., 31: 3-9.

Albino, A.M. (1995): Descripción del más antiguo Viperidae (Serpentes) de América del Sur. Stvd.Geol. Salmant., 31: 11 20.

Key words: Serpents, Viperidae, Pleistocene, South America.

[Description of the oldest Viperidae (Serpentes) from South America].

ABSTRACT. A description of vertebral remains of a viperid exhumed from the San AndrÚs "Formation" (early Pleistocene) at Santa Isabel beach, province of Buenos Aires, Argentina, is given. This is the first record of Viperidae in Argentina and the oldest in South America.

Fuente, M.S. de la; Santillana, S,N, & Marenssi, S (1995): An Eocene leatherback turtle (Cryptodira; Dermochelyidae) from Seymour Island, Antarctica. Stvd. Geol. Salmant., 31: 21 34.

Key words: Antarctic Peninsula, Eocene, Chelonii, Dermochelyidae, Systematic.

[Una tortuga de cuero (Cryptodira: Dermochelyidae) de la isla Marambio (Seymour), Antártica.].

ABSTRACT: The outcrops of La Meseta Formation from Seymour Island yielded the first Antarctic fossil remains of Dermochelyid. It consist of isolated platelets and a small portion of the shell of epithecal nature. This epithecal armor is only known in Middle Upper Eocene to Recent members of the family Dermochelyidae among the turtles. The Antarctic specimens are tentatively referred to Psephophorus, a genus whose species are recorded from Middle Upper Eocene to Pliocene of Europe, New Zealand and North America.

Ushakova, M. & Blyum, N. (1995): Reformation of the surface oceanic circulation during Paleogene: Calcareous nannoplanktonic, foraminiferal and oxigen isotopic evidences. Stvd.Geol.Salmant., 31: 35 54.

Key words: Paleogene, Calcareous nannoplankton, 18O isotopes, Paleoceanography, Surface oceanic circulation.

ABSTRACT: Paleogene calcareous nannoplankton evolution with regard to morphotype changes was analysed. The18O/16O ratio in planktonic foraminifera tests was studied. Conclusions about surface water temperature and salinity changes and about main features of surface circulation based on these data were arrived. Can be seen that the reformation from the mainly halinotypic circulation of the early Paleogene into halotherme one took place in the middle Eocene. In the same time the notable climatic zonation appeared. In connection with the beginning of Antarctic glaciation and climatic cooling during the late Eocene and Oligocene existed mixed halotherme thermohalinic circulation. Since the middle of Miocene the thermotypic circulation became increase.

Jiménez Fuentes, E.; Gil, S. & Pollos, S. (1995): Quelonios del Pleistoceno medio de Las Grajas (Archidona: Málaga). Stvd.Geol.Salmant., 31: 55 62.

Key words: Chelonia (Emys, Testudo), middle Pleistocene, Málaga (Spain).

[Chelonia from the middle Pleistocene of Las Grajas (Archidona, Málaga, Spain.].

ABSTRACT: In Las Grajas cave (Archidona: Mßlaga) the autors recovered two fossil turtles in middle Pleistocene sediments: Testudo aff. hermanni and Emys orbicularis. T. aff. hermanni is represented by males, females and inmature specimens.

Gutiérrez Alonso, G. & Nieto, F. (1995): Variaciones de la "cristalinidad" de la mica blanca y otros parámetros cristaloquímicos a través del antiforme del Narcea (Orógeno varisco del NO de Iberia). Stvd.Geol.Salmant., 31: 63 86.

Key words: White mica, ôcrystallinityö, Metamorphism, Structural geology, Strain and cleavage, Asturias, Narcea Antiform.

e-mail Gabriel Gutiérrez-Alonso

[Variation of white mica "crystallinity" and other crystallochemical parameters across the Narcea antiform (Variscan belt of NW Spain)].

ABSTRACT: X ray diffraction analyses were performed on .white micas, formed under strain and low grade metamorphic conditions, from sandstones to siltstones along a transect through the Narcea Antiform, a large structure that separates the external from the internal zones of the Variscan belt of NW Spain. The results indicate a close spatial relationship between the onset of metamorphism and the cleavage front. The cleavage front is accompanied by an decrease in the ôcrystallinityö index of the white mica from very low to low metamorphic grade. This decrease corresponds qualitatively to an increase in penetrativeness of the axial planar cleavage. In the western part of the Narcea Antiform, the major deformation event was the development of kilometer scale, reverse shear zones. Because of polyphase deformation, these rocks are not suitable for quantitative strain analysis, but qualitatively, finite strain can be observed to be prolate and invariably larger in this region than in the eastern sector. The metamorphic grade is higher in the western part of the Narcea Antiform, with local maxima occurring next to the base of the shear zones. The b0 cell parameter, a semi quantitative geobarometer measured in the white mica, is chaotic in the Eastern sector, showing a clear detrital in heritance. In the western sector it is rational due to complete re equilibration during thermal resetting.

López, G. & Bond, M. (1995): Un nuevo Notopithecinae (Notoungulata, Typotheria) del Terciario Inferior de la Puna argentina. Stvd.Geol.Salmant., 31: 87 99.

Key words: Notoungulata, Notopithecinae, Systematic, New, Eocene, Argentina.

[A new Notopithecinae (Notoungulata, Typotheria) of Lower Tertiary from the argentinian Puna.].

ABSTRACT: The Notopithecinae Interatheriidae are a group of very small typotherian notoungulates, very frequent in the Patagonian Paleogene; generally, they have been considered as ancestral for the more advanced Interatheriinae subfamily. Here, is described Punapithecus minor n. genus and species, from the Geste Formation (Pastos Grandes Group) in Antofagasta de la Sierra, Catamarca Province and San Antonio de los Cobres, Salta Province in northwestern Argentina. The fossiliferous level has been assigned, by its associated fauna, to the Mustersan Age (Middle Eocene). This is the first record for this group in Argentina outside Patagonia; also they have been, certainly, recorded in Paleogene beds of Chile. Punapithecus minor presents the following diagnostic characters: Smaller size (at least half the size) than all the known Notopithecinae. Lower crowned than all the other notopithecines. Upper molars with the paraloph and metaloph open lingually, even on advanced stages of wear; with anteroexternal and posteroexternal fossetes not persistent, and also with anterior and posterior cingula very well developed. The p3 p4 with the talonid more developed than the other Notopithecinae. Molariform lower teeth with the entoconid more bunoid. The afore mentioned characters distinguish P. minor as a very peculiar member of the Notopithecinae subfamily, very different from the Patagonian ones and representing perhaps a more conservative lineage, probably linked to a non descript form from the Upper Eocene or Lower Oligocene of Tinguirica, Central Chile. Suggestively this two forms have been recorded otside Patagonia.

Artículos publicados en Stvdia Geologica Salmanticensia (1970 1995). Stvd.Geol.Salmant., 31: 101 121.

Key words: List of papers, Bibliography.

[Papers published in Stvdia Geologica Salmanticensia (1970 1995)].