24. coloquio europeo de micropaleontologia

Centro de Informacion y Documentacion Cientifica (CINDOC). C/Joaquin Costa, 22. 28002 Madrid. SPAIN / CINDOC - Centro de Informaciòn y Documentaciòn CientìficaSIGLEESSpai

Biostratigraphie du Maastrichtien basco-cantabrique ; ses foraminifères planctoniques

The rich associations of Maastrichtian planktonic foraminifera in the cliffs of the Basque Country allow us to stablish a biozonation likely other ones in the Mesogea during this age. The Campanian-Maastrichtian boundary is characterised by the extinction of Globotruncanita calcarata species. Several species of the genus Globotruncana with two keels, for instance : C. area, G. linneiana, are abundant, also the species of the genus Globotruncanita : G. stuartiformis, G. insignis increased their numbers in the youngest beds of the lower Maastrichtian. These associations characterised the G. falsostuarti Zone. Above this zone may be defined a second one with a greater number of species than the former. Globotruncana esnehensis, G. contusa and Racemiguembellina fructicosa have their first apparition in this interval named the G. stuarti Zone. Eventually, a third zone, the youngest one, A. mayaroensis Zone, is characterised by its index species and the association of G. area, G. contusa, G. stuarti, Trinitella scotti, and R. fructicosa. The spiroconvex species are increased in this zone, and on the other hand can be tested a lowering specific diversity in the uppermost part. This event is gradual in nature, not catastrophic, and it is previous to the Cretaceous-Tertiary boundary.Dans les matériaux d'âge maastrichtien des falaises côtières du Pays Basque on trouve de riches associations de foraminifères planctoniques qui permettent d'établir une biozonation semblable à celles définies dans le reste de la Mésogée. La limite Campanien-Maastrichtien est datée par l'extinction de Globotruncanita calca-rata. La partie inférieure ou Zone à Globotruncana falsostuarti est caractérisée par l'abondance des espèces bicarénées de Globotruncana s.l. : Garca, G. linneiana, etc., et la progressive abondance de Globotruncanita spp. : G. stuartiformis, G. insignis, etc. Au-dessus il y a une partie moyenne avec des associations plus riches en espèces : Globotruncana esnehensis, G. contusa et Racemiguembe-lina fructicosa font ici leur apparition. Cette partie est corrélée avec la Zone à G. stuarti. Finallement, dans la partie supérieure ou Zone à A. mayaroensis, les espèces les plus abondantes sont : G. area, G. stuarti, G. contusa, R. fructicosa, etc. Les espèces spiro-convexes gagnent en abondance et dans les derniers décimètres on peut constater une disparition graduelle des espèces, c'est-à-dire, l'association est, bien sûr, plus pauvre à la limite Crétacé-Tertiaire qu'aux niveaux précédents.Lamolda M.A. Biostratigraphie du Maastrichtien basco-cantabrique ; ses foraminifères planctoniques. In: Géologie Méditerranéenne. Tome 10, numéro 3-4, 1983. Colloque sur les étages coniaciens à Maastrichtien. Marseille, 26-28 septembre 1983. pp. 121-126

Essai de biostratigraphie quantitative du Sénonien inférieur du Valle de Losa, bassin basco-cantabrique

The Losas Formation in the central part of the Basco-Cantabrian Basin has a marly and calcareous nature, with a thickness of 1200 m. or more. It is is dated of lower Coniacian-upper Santonian age. Two composed sections have been studied : fora-minifers and ostracods are the fossil fauna treated. The planktonic foraminifers allow us to recognise the D. concavata Zone and the D. asymetrica Zone. All the studied fauna is characteristic of the shelf, inner westward and outer toward the eastern area. We have choised 20 ostracod species with the greatest biostratigraphical signification, among the 118 ones recognised. Its occurrences or absences in the samples of both sections have been computed after the P2M program (BMDP, Dixon 1981). Type-Q cluster analysis keep on evidence several samples groups related with the lithologie units, or subgroups when nearest samples are considered, both with the choised ostracod species. The study of the structure of a dendrogramme allow us to stablish biostratigraphical units that may be correlated with the planktonic foraminifers ones ; a detailed correlation is stated between both sections when the smallest distances between samples are taken into account.La Formation des Losas, dans la partie centrale du Bassin Basco-Cantabrique, est composée de marnes et de calcaires pouvant atteindre 1200 m d'épaisseur, datée du Coniacien inférieur-Santonien supérieur. Les foraminifères et ostracodes ont été étudiés à partir de deux ensembles de coupes. Les foraminifères plane-toniques permettent de distinguer les zones à D. concavata et D. asymetrica. La faune considérée est caractéristique d'un domaine de plate-forme interne pour l'ouest de la Vallée, et externe pour sa partie est. 20 espèces d'ostracodes ayant une certaine valeur bios-tratigraphique ont été choisis parmi les 118 espèces que nous avons déterminées. Leur présence ou absence dans les échantillons a été computée selon le programme P2M (BMDP, Dixon 1981). L'Analyse de Groupes (Cluster A.) (type-Q) nous permet de reconnaître plusieurs ensembles d'échantillons en relation avec les unités lithologiques, ou bien sous-groupes quand nous considérons des échantillons plus proches, toujours basée sur les espèces d'ostracodes choisies. L'étude de la structure d'un dendogramme permet aussi d'établir des unités biostratigraphiques, qui peuvent être comparées à celles obtenues avec les foraminifères planctoniques ; on peut faire aussi une corrélation détaillée entre les deux ensembles de coupes si l'on considère les minimes distances pour les échantillons analysés dans les dendrogrammes.Rodriguez-Lazaro J.M., Lamolda M.A. Essai de biostratigraphie quantitative du Sénonien inférieur du Valle de Losa, bassin basco-cantabrique. In: Géologie Méditerranéenne. Tome 10, numéro 3-4, 1983. Colloque sur les étages coniaciens à Maastrichtien. Marseille, 26-28 septembre 1983. pp. 155-162

The role of the IGCP Spanish National Committee in the UNESCO-IUGS Global enterprise, working together for constructing a better world

35th International Geological Congress, 27 August - 4 September 2016, Cape Town, South AfricaThe Spanish National Committee (SNC) has a long tradition going back at the Program dawning, as Spanish delegates took part in the initial discussions of “Experts” from 52 countries in Paris (1971). Between 1973 and 1975 a Commission was working to set the basis for the successful constitution of the SNC in 1975; in 1976 Spanish scientists started their collaboration in the IGCP and since them Spain has been very active. The SNC was one of the pioneer Committees, together with other three countries (Austria, Sweden and Switzerland). The goals of this report are to briefly summarize the contribution of the SNC to the aims of IGCP and to stand out the implications of this labour for the advancement of the Geosciences in Spain and its consequences. The outcome of the SNC activities linked to the IGCP has had impact in several aspects, being critical the improvement of Earth Science education in Spain through the relation between education and research. The Spanish participation in the IGCP fostered the advancement in geological knowledge and the public outreach of results that would even be enhanced with the new International Geoscience Geoparks Programme. Another relevant aspects have been the development of international scientific cooperation, its importance in the future of geological research and its impact to society. Through the participation in more than 100 IGCP projects (out of about 350 funded), Spain has contributed to the active participation of more than 1,000 Spanish scientists in the global net and has also pursued an intergenerational approach, supporting the presence of many young (master and Ph. D. students) and early carrier scientists. Within the frame of active working groups close to 100 Doctoral Thesis have been finished and many special symposia, fieldtrips and workshops have been organised in Spain. Scientific contributions are enormous and can serve as example of the Spanish contribution to IGCP main goals.The participation of Spain in the IGCP over 40 years has been instrumental in exchanging and advancing the geological knowledge upon which the society has to built a better and more sustainable world for future generations. The IGCP has also been fundamental in allowing Spanish scientists to participate in (and sometimes establish) international multidisciplinary research teams with production of high-quality data and facilitating the collaboration of senior and early career scientist and Ph.D. students. All these actions are relevant for effectively contributing to solve some of the main problems that our modern society is facing and consequently, the SNC plays an important role in developing the IGCP motto: “Geology in the Service of Society”Peer Reviewe