Person: Rodríguez García, Sergio
Universidad Complutense de Madrid
Faculty / Institute
Geodinámica, Estratigrafía y Paleontología
Now showing 1 - 10 of 27
PublicationContrasting reef patterns during the evolution of the carboniferous azrou-khenifra basin (Moroccan Meseta)(Springer Nature, 2022-11-12) Cózar Maldonado, Pedro; Somerville, Ian D.; Rodríguez García, Sergio; El Houicha, Mohamed; Vachard, Daniel; García Frank, Alejandra; Coronado Vila, Ismael; Izart, AlainFive types of reefs are described from the northern and southern parts of the Azrou-Khenifra Basin generated by the interactions of microbes and coral communities. The type 1 microbial reefs grew in both shallow- and deep-water settings, with a strong control by glacioeustasy. Type 2 microbial reefs developed in more tranquil periods, associated with common intermounds, and where only a single major regressive-transgressive sequence is recognised. Type 3 microbial reefs developed in constant deeper water conditions, generated by higher rates of subsidence in the basin, and creating an overall deepening-upward sequence. Type 4 microbial reefs recognised in the northern part of the basin have no clear counterparts in southern outcrops, but they are likely the capping strata observed in the latter area. Rugose corals allow to define a Type 5 reef, unrelated to microbial facies, and are recorded in oolitic-bioclastic backshoals or quiet inner platform settings. The presence of similar reefs in both the northern and southern parts of the basin demonstrates that conditions were not as different as previously proposed, and a lithostratigraphical, environmental uniformity occurs, which permits the analysis of different subsidence rates and glacioeustastic influence. In the Azrou-Khenifra Basin, the reefs, as well as other regional features, suggest that the basin, overall, evolved from an extensional tectonic regime during the early Brigantian into a complex extensional or compressional regime during the early Serpukhovian, passing into a predominantly compressional phase during the late Serpukhovian in a polyphase tectonic inversion during the onset of the Variscan Orogeny in the region. PublicationGeodivulgar: Geología y Sociedad 2018(2019-06-28) García Frank, Alejanadra; Canales Fernández, María Luisa; Muñoz García, Mª Belén; González Acebrón, Laura; Rodríguez García, Sergio; Martínez Gutiérrez, Gemma; Cózar Maldonado, Pedro; Calonge García, María Amelia; Gómez Heras, Miguel; Henriques, Maria Helena; Díaz Mejías, Isabel; Alonso Recio, Carlos; Rico Arjona, Rocío; Berrocal Casero, Mélani; Hernández Paredes, Ruth; Hontecillas Tamayo, Daniel; Martín Perea, David Manuel; Salazar Ramírez, Roselis Waikiria; Silva, Silvia; Mateos Carralafuente, Ricardo; Acedo Peñato, Abel; Cervilla Muros, Miguel Ángel; Iglesias Álvarez, Núria; Rodríguez García de Castro, Isabel; Sánchez Fontela, Noelia; Villar Peláez, Alberto; Vitón García, Iñigo; Conde Carrión, Teresa; de la Fuente Olmos, Daniel; Gamarra González, Jesus; Herranz García, Sergio; Ortiz Lucena, Antonio; Sierra Ramírez, Nuria; Armendáriz Sanz, Andrés; Borrego Salgado, David; Chicote Alvira, Gabriel; Coronado Vila, Ismael; Fesharaki, Omid; Fraguas Herráez, Ángela; González Blázquez, Javier; Hernández Fragua, Laura; Navalpotro Gordo, Tania; Portales, Killian; Guilló Carrasco, Vicente Eduardo; Montesinos del Valle, Mercedes; Peña Vilanova, Jorge; Pérez Martín del Campo, Daniel; Pérez Garrido, Carlos; Prieto Saiz, Irene; Sarmiento, Graciela N.; Mediato Arribas, José Francisco; del Moral González, Begoña; Rodrigo Sanz, Ana; Gonzalo Parra, Lorena PublicationEnvironmental parameters of a coral assemblage from the Akerchi formation (Carboniferous), Adarouch area, central Morocco(Springer, 2010) Said, I.; Rodríguez García, Sergio; Berkhli, Mostafa; Cózar, P.; Gómez Herguedas, AlbertoRich assemblages of rugose corals occur in the Tizra, Akerchi and Idmarrach formations (Mississippian) near El-Hajeb City. The Akerchi Formation, approximately 140 m thick, is divided into two members. The upper part of the lower member contains a biostrome 2 to 5 m thick, composed mainly of rugose corals and gigantoproductid brachiopods embedded in marly limestone. Its local thickness increases from southwest to northeast in an outcrop extending for more than one kilometre. The Akerchi biostrome is mostly composed of rugose corals. Brachiopods, bryozoans, porifera (chaetetids, sponges), and molluscs are conspicuous elements of the biostrome, but none of them constitutes a significant component. Other common fossil taxa in thin sections are foraminifers, algae and cyanobacteria, ostracods, trilobites and echinoderms. The coral assemblage in the biostrome is regarded as a paleocommunity, because the biostrome is not composed of distinct coral bearing beds in different time slices, but rather, it is a mass of corals which in many instances show their original relationships and continuous colonial growth. The assemblage is diverse, including 12 genera and 20 species. Micro- and macrofacies analyses of corals and surrounding rock allowed some environmental inferences: a high level of energy is suggested by the degree of fragmentation of branches in fasciculate colonies and other features of the rocks. However, the energy was not high enough to destroy the colonies, and the presence of abundant micrite indicates that the energy level was discontinuous. Other environmental factors inferred from paleoecological and taphonomical evidences are shallow water with normal marine salinity and a hard substrate provided by quick cementation of oolite bar and by abundant bioclasts. Massive coral colonies and gigantoproductids are attached directly to the oolite bar which in turn provided a hard susbstrate for attachment of fasciculate corals that are dominant in the biostrome. PublicationLate Viséan-Serpukhovian foraminiferans and calcareous algae from the Adarouch region (central Morocco), North Africa(Wiley, 2008-06) Cózar Maldonado, Pedro; Vachard, Daniel; Somerville, Ian D.; Berkhli, M.; Medina Varea, Paula; Rodríguez García, Sergio; Said, I.Three Upper Viséan to Serpukhovian limestone formations from the Adarouch region (central Morocco), North Africa, have been dated precisely using foraminiferans and calcareous algae. The lower and middle part of the oldest formation, the Tizra Formation (Fm), is assigned to the latest Asbian (upper Cf6γ Subzone), and its upper part to the Early Brigantian (lower Cf6δ Subzone). The topmost beds of this formation are assigned to the Late Brigantian (upper Cf6δ Subzone). The lower part of the succeeding Mouarhaz Fm is also assigned to the Late Brigantian (upper Cf6δ Subzone). The Akerchi Fm is younger than the other formations within the region, ranging from the latest Brigantian (uppermost Cf6δ Subzone) up to the Serpukhovian (E1-E2. The base of the Serpukhovian (Pendleian Substage, E1) is repositioned, to coincide with the appearance of a suite of foraminiferans including Archaediscus at tenuis stage, Endothyranopsis plana, Eostaffella pseudostruvei, Loeblichia ukrainica, Loeblichia aff. minima and Biseriella? sp. 1. The upper Serpukhovian (Amsbergian Substage, E2) is marked by the first appearance of Eostaffellina ex. gr. paraprotvae and Globoomphalotis aff. pseudosamarica. The biostratigraphical scheme used for the reassessment of the foraminiferal zones and subzones in the Adarouch area closely compares with that for the British succession in northern England (Pennine Region), where the stratotypes of the Upper Viséan (Asbian and Brigantian) and Early Serpukhovian (Pendleian) substages are located. Thus, a succession equivalent to an interval from the Melmerby Scar Limestone to the Great (or Little) Limestone is recognized. These assemblages are also compared to other foraminiferal zones proposed in other regions of Morocco. Several foraminiferans have been identified that are proposed as potential Serpukhovian markers for other basins in Western Europe, and compared to sequences in Russia and the Donets Basin, Ukraine. PublicationGEODIVULGAR: Geología y Sociedad(2021-06) García Frank, Alejandra; Canales Fernández, María Luisa; Muñoz-García, María Belén; González Acebrón, Laura; Rodríguez García, Sergio; Alonso-Zarza, Ana María; Martínez Gutiérrez, Gemma; Herrero Domínguez, Santiago; Cózar Maldonado, Pedro; Calonge García, María Amelia; Gómez Heras, Miguel; Fraguas Herráez, Ángela Raquel; Henriques, María Helena Paiva; Coronado Vila, Ismael; Díaz Megías, Isabel; Alonso Recio, Carlos; Navarro Terrón, Esther; Alonso García, Rocío; Sánchez Fontela, Noelia; Gamarra González, Jesus; Mateos Carralafuente, José Ricardo; Acedo Peñato, Abel; García Peco, Víctor; Ozkaya de Juanas, Senay Amalia; Sanz Pérez, Dánae; Cambronero García-Miguel, Irene; Galán Casado, José Miguel; Chiri Pérez, Oliver; Gómez-Escalonilla Canales, Víctor; Oliete Puertas, Elena; García Osuna, David; Vega Carricondo, Alejandro; Martín Aguilar, Lourdes; Carvajal de Lago, Alba María; Corbalán García, Judit; Portales Núñez, Killian; Montesinos del Valle, Mercedes; Gamallo Paz, Isabel; Armendáriz Sanz, Andrés; Vitón García, Íñigo; Salas Herrera, Javier; Cervilla Muros, Miguel Ángel; Iglesias Álvarez, Núria; Hontecillas Tamayo, Daniel; Pérez Garrido, Carlos; Fesharaki, Omid; Díez García, Irene Pilar; Rodrigo Sanz, Ana; del Moral González, Begoña; Mediato Arribas, José Francisco; Pérez Martín del Campo, Daniel; Chicote Alvira, Gabriel; López Martín, Valle; Campos Millán, Eduardo; Fajardo Portera, Pilar; Nacenta Torres, Pablo; Rodríguez García de Castro, Isabel; Salazar Ramirez, Roselis Waikiria PublicationPalaeobiogeographical constraints on the distribution of foraminifers and rugose corals in the Carboniferous Tindouf Basin, South Morocco(Elsevier, 2013-01) Somerville, Ian D.; Cózar Maldonado, Pedro; Said, Ismail; Vachard, Daniel; Medina Varea, Paula; Rodríguez García, SergioThe northern flank of the Tindouf Syncline in southern Morocco exhibits a continuous, well exposed Carboniferous succession with limestones of Late Asbian to Early Bashkirian age containing rich and diverse foraminiferal and rugose coral assemblages. Analysis of these assemblages provides new data on the relatively poorly known Saharan basins. The palaeobiogeographical relationship of the Tindouf Basin with other Palaeotethyan basins is complex. Although there is a predominance of cosmopolitan taxa for the Palaeotethys, it is recognized that there was an influence of basins from NW Europe, such as the UK and Ireland. Some taxa are recorded in both NW Europe and Tindouf without any characteristic contributions from intermediate basins in northern Morocco. The neighbouring Béchar Basin in Algeria presents distinct assemblages. The bulk of the data analyzed suggest that this sector of the western Palaeotethys can be subdivided into four palaeobiogeographical subprovinces: the Atlantic Subprovince (UK, Ireland, N France and Belgium), the Mediterranean Subprovince (Pyrenees, Montagne Noire, Betic Cordillera, Rif (N Morocco) and Balearic Islands), and the Saharan Subprovince (Béchar, Reggan, Ahnet-Mouydir and Tindouf). In between, mobile belts of mixed faunal assemblage characteristics are observed (e.g., SW Spain and Central Meseta) forming the West peri-Gondwanan Subprovince. Analysis of the Tindouf Basin faunas shows that, as in other Saharan basins, there is a high diversity and abundance of foraminiferal taxa, with a higher proportion of survivors and longer stratigraphic ranges; these features also are mirrored by rugose corals. This emphasizes the longevity of the carbonate platform in a tropical setting, where periodic transgressions introduced new assemblages, and oceanic currents are interpreted as one of the main controlling factors for the distribution of the taxa in these subprovinces. Moreover, not only were water temperatures on the platform higher, but also tectonic stability greater. It is considered that the effects of the first phases of the Gondwanan glaciation were minimal on the Tindouf faunas. PublicationMississippian coral assemblages from Tabainout mud-mound complex, Khenifra area, Central Morocco(Geologica Belgica. Université de Liège, 2012) Somerville, Ian D.; Rodríguez García, Sergio; Said, Ismail; Cózar Maldonado, PedroAnalysis of Mississippian coral assemblages from the Khenifra region of Central Morocco has demonstrated the presence of a rich and diverse coral fauna. Rugose coral assemblages from the Tabainout mud-mound complex comprise abundant colonial and solitary taxa, particularly in the basal bedded limestones, as well as the upper bedded flank and coquina capping beds. The massive core facies with stromatactoid cavities in contrast has rare solitary corals. The overlying shales, marls and limestone bands which buried the mud-mound are dominated by small non-dissepimented solitary rugosans. The age of the Tabainout mound based on foraminifers is established as upper Viséan (late Asbian-late Brigantian). The coral assemblage strengthens correlations with the Adarouch area in the northern part of the Azrou-Khenifra Basin where similar mud mounds occur. These assemblages also show similarity with coeval coral faunas from the Jerada mud-mounds (buildups) of NE Morocco and together represent part of the same palaeobiogeographic province (Western European Coral Province). PublicationGeodivulgar: Geología y Sociedad(2023-07-07) García Frank, Alejandra; Acedo Peñato, Abel; Alonso Zarza, Ana Maria; Alonso Garcia, Rocio; Armendáriz Sanz, Andrés; Berrocal Casero, Mélani; Calonge García, Mª Amelia; Cambronero García-Miguel, Irene; Campos Millán, Eduardo; Canales Fernandez, María Luisa; Carvajal De Lago, Alba María; Cazorla Bermejo, Miguel; Cernadas Garrido, Antonio; Cervilla Muros, Miguel Ángel; Chicote Alvira, Gabriel; Chiri Pérez, Oliver; Corbalán García, Judit; Coronado Vila, Ismael; Cózar Maldonado, Pedro; Del Moral González, Begoña; Diaz Megias, Isabel; Díaz Olías, Ana; Díez García, Irene Pilar; Esteve Serrano, Jorge Vicente; Fajardo Portera, Pilar; Fesharaki, Omid; Fraguas Herráez, Ángela Raquel; Fuentes Rodriguez, María; Gamallo Paz, Isabel; Gamarra González, Jesús; García Martín, Gema; García Peco, Víctor; Gómez Recio, Marta; Gómez Heras, Miguel; González Acebrón, Laura; Gutiérrez Gálvez, María; Henriques, Maria Helena Paiva; Herrero Maire-Richard, Laura; Herrero Dominguez, Santiago; Hontecillas Tamayo, Daniel; Iglesias Álvarez, Núria; Martín Perea, David Manuel; Martín Aguilar, Lourdes; Martínez Álvarez, Leyre; Martínez Gutiérrez, Gemma; Mateos Carralafuente, José Ricardo; Mediato Arribas, José Francisco; Mejía Ruiz, Irene; Molero Monsonis, Andrea; Montesinos Del Valle, Mercedes; Moreno Muñoz, Alberto; Muñoz García, María Belen; Nacenta Torres, Pablo; Navarro Terrón, Esther; Oliva Martín, Anabel; Ozkaya De Juanas, Senay; Portales Núñez, Killian; Quesada García, Álvaro; Rodrigo Sanz, Ana; Rodríguez García, Sergio; Rodríguez García De Castro, Isabel; Romero García, Santiago Alejandro; Salas Herrera, Javier; Salazar Ramírez, Roselis Waikiria; Sánchez Fontela, Noelia; Sanz Pérez, Dánae; Suárez Pérez, María Gabriela; Torices Hernandez, Angélica; Vega Carricondo, Alejandro; Vitón García, Íñigo; Yubero Martínez, Miguel PublicationA new genus and species of colonial rugose coral from late Tournaisian (Waulsortian) mud-mounds in Ireland: Its ecological associations and depositional setting(Elsevier, 2010) Somerville, Ian D.; Rodríguez García, SergioA new genus and species of fasciculate rugose coral, Howthia suttonensis Somerville and Rodríguez, has been recorded from Howth peninsula, County Dublin, Ireland, in Waulsortian mud-mound limestones of upper Tournaisian age. The new colonial genus is characterized by having an axophyllid axial structure, steeply inclined tabellae, and presence of interseptal and lonsdaleoid dissepiments. It evolved probably from a solitary Axophyllum by the development of peripheral offsets. This new taxon may have been an ecological pioneer adapting to a specialised niche near the top of a large Waulsortian mud-mound in shallower water than most Waulsortian settings and, as such, may have provided a novel evolutionary opportunity. Howthia suttonensis is associated with Amplexocarinia and an unusual form of ‘Fasciculophyllum’, both of which display budding and protocoloniality, as well as the fasciculate tabulate coral Syringopora. PublicationCorals from Asturian substage in Cantabrian Mountains: A review(International Union of Geological Sciences, 2022) Rodríguez García, Sergio; Coronado Vila, Ismael; Rodríguez Castro, IsabelThe subdivision of the Pennsylvanian divided the Namurian, Westphalian and Stephanian regional stages in substages named with letters. During the second half of the 20th Century, some of these substages were more properly defined. Westphalian A, B and C were defined as Langsettian, Duckmantian and Bolsovian. The Stephanian A was renamed as Barruelian and the transition between Westphalian and Stephanian as Cantabrian. The Westphalian D, defined in continental strata from Saar-Lorraine, was proposed to be substituted by the Asturian substage with the stratotype in the Cantabrian Mountains. An extensive documentation with assemblages and stratigraphic distribution of plants, fusulinids, brachiopods, corals, molluscs and ostracods was presented. But a formal definition of the stratotype was never proposed. The Asturian substage in the Cantabrian Mountains comprises both marine and terrestrial strata rich in fossils and allows easy correlations with other areas. Recent studies have improved the stratigraphic data and the knowledge on the coral assemblages, mainly in the eastern area of Asturias and Palencia. The entire coral assemblage from Asturian substage in the Cantabrian Mountains is composed of 48 named species and 20 species described in open nomenclature. The short stratigraphic range of many of them may be the basis for the characterization of the Asturian stage with corals. Although some species are endemic in the Cantabrian Mountains, there are some species that are also present in other regions of the Palaeotethys. At the generic level there are significant similarities that should be the basis for wider correlations with North America and East Asia.