Flores, J.A. (1988): Representantes de Helicosphaera en sedimentos del Neógeno en el Atlántico oriental. Stvdia Geologica Salmanticensia, 25: 7-35.
ABSTRACT: The present paper is centred on the study of helicoliths which can be recognized in different sections of the Guadalquivir and South Riff basins (Spain and Morocco), as well as in Deep Sea Drilling Project sites of the Western-Atlantic. Of said morphotype a systematic study is carried out, similarly another quantative character is shown with wich we will try to prove its variabihty depending on environmental changes which could have taken place. By comparison with the distribution of the other index taxa, it is observed that the morphotype in genera (whose dominant specie is Helicosphaera carteri [Wallich]) suffers a quantative reduction linked to a lowering of the temperature of the water masses. The most important quantative change takes place in the Upper Toronian. Towards the Upper Messinian a certain recuperation seems to start, probably related to a relatively warmer waters.
Aspects of preservation are also dealt with. The relatively easy dissolution of the Helicosphaera taxa determines that, based on its absence, presence and the particular state of the nannoliths, they can be used to evaluate the degree of alteration of an association in a determined sample.
Martín Izard, A. (1988): Estratigrafía y sedimentología del Complejo Esquisto Grauváquico en la zona de Ciudad Rodrigo (Salamanca). Stvdia Geologica Salmanticensia, 25: 37-58
ABSTRACT: The main stratigraphic features of the metasediments hich make up the schist graywacke complex (CEG) in the Ciudad Rodrigo area, in the western part of the Salamanca province, are guiven in this paper.
The metamorphic rocks are mostly quartzites, conglomerates and slates, as well as some calc silicate layers, which are included into 5 stratigraphic units were sericitic, quartzsericitic and ampelitic slates predominate.
From the sedimentological point of view, the metamorphic rocks of the CEG consist mainly of alternating carbonaceous rich silstones and sandstones - in which sedimentary textures are frecuently preserved - deposited predominantly as fine grained siliciclastic materials either at the margin of a continental shelf or in an epicontinental sea.
Jiménez Fuentes, E., Martín de Jesús, S., Mulas Alonso, E. & Pérez Ramos, E. (1988): Un quelonio fósil del Oligoceno de Los Barros (Ávila). Stvdia Geologica Salmanticensia, 25: 59-65.
ABSTRACT: A Testudinidae determined as ?Cheirogaster sp. or ?Ergilemys sp. found in "Los Barros" quarry (placed 4 Km, SE from Avila) is described. The quarry gisement has presently been destroyed. The age of the fossil is dates as Lower Oligocene.
Guisado, R., Armenteros, I. & Dabrio, C.J. (1988): Sedimentación continental Paleógena entre Almazul y Deza (Cuenca de Almazán oriental, Soria). Stvdia Geologica Salmanticensia, 25: 67-85.
ABSTRACT: Paleogene terrestrial sedimentation between Almazul and Deza {Eastern Almazan Basin, Soria).
Eight lithostratigraphic units corresponding to alluvial and lacustrine deposits with interbedded paleosoil layers have been distinguished in the paleogene deposits cropping out along the eastern margin of the Almazan Basin. In spite of the complex lateral and vertical relationships, detailed sedimentological analysis led to the recognition of three magasequences thought to be related to the vertical evolution of sedimentary environments in response to varying tectonic activity along the sierra front they are attached to.
Sánchez Benavides, F.J., Alonso Gavilán, G. & Dabrio, C.J. (1988): Sedimentología de los depósitos lacustres neógenos de Castrillo del Val (Burgos, España). Stvdia Geologica Salmanticensia, 25: 87-108.
ABSTRACT: Two informal lithostratigraphic units are proposed in the terrestrial Neogene deposits of the northeastern Duero Basin, including ten associations of sedimentary facies considered to be representative of lacustrine, deltaic, paludal and fluviatile sedimentary environments. Unit I (the lower one) consists of marls and gypsarenites deposited in saline lakes, topped by shallow lacustrine (paludal) fresh water carbonates with pseudomicrokarst surfaces indicative of repeated subaerial exposure due to water level oscilations. Unit 2 is made up of lacustrine fossiliferous marls ad carbonate silts, deposited near the mouth bars of distributary deltaic channels, overlaid by paludal carbonates. The major sedimentary controls recognized in this tectonically quiet area with semiarid seasonal climate are: (l) chemistry of lake waters, (2) lake-level fluctuations and (3) low siliciclastic input. At the time of deposition of Unit 2, the lake acted as stratified during dry seasons {or longer periods ot time) but large inflows of fresh waters during rainy seasons changed it into an open lake realm.
González Delgado, J.A. (1988): Estudio sistemático de los gasterópodos del Plioceno de Huelva (SW de España). III. Mesogastropoda (Scalacea-Tonnacea). Stvdia Geologica Salmanticensia, 25: 109-159.
ABSTRACT: The present work is a systematic study of 29 species of Mesogastropoda (Scalacea Tonnacea) from different pliocene outcrops (Lower Zanclean) from Huelva (Guadalquivir Bassin). Also presented are their abundance, chronostratigraphic, bathymetric and geographic distribution together with the substrate type, nutrients and recent citations in the Spanish Pliocene.
Mulas Alonso, E., Jiménez García, S., Martín de Jesús, S. & Jiménez Fuentes, E. (1988): Columna estratigráfica del yacimiento de icnitas de dinosaurios del Cretácico Inferior de Cornago (La Rioja). Stvdia Geologica Salmanticensia, 25: 161-167.
ABSTRACT: The stratigraphy of palaeoichnological (dinosaurian footprints) beds in the Lower Cretaceous of Cornago (La Rioja, Spain) is described and analyzed. Some palaeocological informations are obtained.
Santisteban, C. de, Brito, J. & Usera, J. (1988): Sedimentología de los depósitos de carbonatos lacustres de la cuenca miocénica de Valencia - Liria (provincia de Valencia). Stvdia Geologica Salmanticensia, 25: 169-180.
ABSTRACT:_ The Miocene basin of Valencia Lliria is located in the Iberian area of the Valencia province. This basin was filled up with marine and continental deposits and among them predominate the lacustrine carbonates. In these carbonates seven fa cies have been distiguished: white laminated limestones, pisolithic limestones, banded micritic limestones, limestones with algal reefs, micritic limestones with gastropods, calcareous breccias and laminated oolithic limestone. These facies appear associated to each other and are organized in shallowing upwards sequences.
Most of the deposits of these facies are organic carbonates sedimented on the platform and slope of a permanent freshwater lake. The ciclicity of these deposits is the result of changes in the lake water level which were recorded in the platform sediemnts.
Mulas Alonso, E., Martín de Jesús, S. & Jiménez Fuentes, E. (1988): Sobre la herpetofauna paleógena de algunos yacimientos al N. del Duero (Zamora). Stvdia Geologica Salmanticensia, 25: 181-185.
ABSTRACT: The Paleogene (Lower to Middle Eocene) fossiliferous deposits of Zamora (Spain) yield a riche fauna of reptiles that shows some differences from place to place.
Towards the north of the presen~t day Duero River only a species of Neochelys aff. arenarum Broin appears, Sedimentological analysis revealed that this species lived in lacustrine realm where two types of gisements were formed: accumulations of disjointed remains in deltaic channels and accumulations of well preserved remains, including many complete skeletons, in ephemeral channels tilled up with sediments transported in mass. Inmature individuals are abundant and more frequent than adults.
Towards the north, no carettochelyids were found, they seem to be replaced by scarce trionychids. With respects to crocodilians, only some remains of Diplocynodon appear.
González Regalado, M.L. & Ruiz Muñoz. R. (1988): Foraminíferos bentónicos de las arenas pliocenas de El Rompido (provincia de Huelva). Stvdia Geologica Salmanticensia, 25: 187-203.
ABSTRACT; Benthic foraminiferal faunal from the Lower Pliocene sands of El Rompido section (Huelva), are here studied. This allows us to increase tbe paleontological analysis of the area and to contribute to the knowledge of the paleoecology during that period in the western sector of the Guadalquivir Basin. Seventy six species are identified in this section, 10 of which are new in the region.
Jiménez Fuentes, E, Mulas Alonso, E., Martín de Jesús, S. & Pérez Ramos, E. (1988): Tipos depositados en la Sala de las Tortugas de la Universidad de Salamanca. Stvdia Geologica Salmanticensia, 25: 205-210.
ABSTRACT: A list of types deposited in the Chelonians Room of the Salamanca University is presented. It includes: "Trachyaspis turbulensis", Asturichelys multicostatus, Neochelys salmanticensis, "Podocnemis carbajosai", Allaeochelys casasecai, "Podocnemis entodermica", Duerochelys arribasi, "Podocmenis armuniensis", Cheirogaster bolivari y Cheirogaster richardi.
Moreno, E.G. (1988): Representación gráfica de dominios biométricos en micromamíferos. Soporte informático para la comparación biométrica. Stvdia Geologica Salmanticensia, 25: 211-230.
ABSTRACT: A computer utility for the biometric sample comparison is offered, on the base of scatter diagram, regression line, probability ellipse and asymmetric ovoid analysis, as well as for the sample file storage and the calculation of the main sample statistical parameters.