Palustrine sedimentation and associated features—grainification and pseudo-microkarst—in the Middle Miocene (intermediate unit) of the Madrid Basin, Spain

Alonso-Zarza, Ana María; Calvo, J.P.; Cura, María Ángeles García del

doi:10.1016/0037-0738(92)90138-h

Cited by 111 publications

(53 citation statements)

References 24 publications

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“…The deposits are interpreted as a low gradient lake margin that exposed/inundated large areas with slight changes in water level. Similar examples have been described in the Cenozoic deposits of the Duero and Tajo basins (Alonso-Zarza, 2003;Alonso-Zarza et al, 1992;Huerta and Armenteros, 2005;Huerta et al, 2011).…”

Section: Geographical and Geological Settingsupporting

confidence: 75%

Unusual sauropod tracks in the Jurassic-Cretaceous transition. Cameros Basin (Burgos, Spain)

Fernández-Baldor¹,

Díaz-Martínez

Contreras³

et al. 2015

Journal of Iberian Geology

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The Las Sereas site includes at least 14 ichnological outcrops along 5.6 km, in the Lara area, southwest Burgos Province. 67 ichnites of dinosaurs are documented at Las Sereas 7, identified as theropod and sauropod trackways occurring in shallow carbonates of lacustrine environment. Sauropod trackways have intermediate-gauge and low heteropody, and show different anatomical features to other tracks found in the ichnological record, especially in the disposition and orientation of pes digits. They are similar to Polyonyx from the Middle Jurassic of Portugal. However, since they do not preserve reliable manus data they are classified as aff. Polyonyx. The three sauropod trackways are related to the same kind of trackmaker. They differ from each other only in size, and gregarious behavior has not been detected. Analysis of these trackways reveals changes in travel direction even when there are few tracks in each sequence. At the Las Sereas 7 tracksite, the pace length (PL), width of the angulation pattern (WAP) and the WAP/PL ratio and depth analysis via photogrammetry show a direction change in two sauropod trackways. This tracksite and that at La Pedraja are unique in the Tithonian-Berriasian interval of the Iberian Peninsula that occur in a lacustrine environment, and could be indicate of the relationship between the diversity of Iberian, Tithonian-Berriasian sauropod tracks and sedimentary environments.Keywords: Dinosaurs, Sauropod tracks, Tithonian, Berriasian, Cameros Basin, Iberia Resumen El yacimiento de Las Sereas se compone de al menos 14 afloramientos icníticos que se localizan a lo largo de 5,6 Km de longitud en la comarca de Lara, en el sureste de la provincia de Burgos. En el afloramiento de Las Sereas 7 se han documentado 67 icnitas de dinosaurios, identificadas como terópodas y saurópodas, producidas en un ambiente lacustre carbonatado somero. Las rastros saurópodos son de anchura intermedia y heteropodia baja mostrando caracteres anatómicos diferentes a los encontrados en el registro icnológico conocido, en especial en lo referente a la disposición y orientación de los dedos del pie. La mayor semejanza de estas icnitas saurópodas se establece con Polyonyx del Jurásico Medio de Portugal, pero al carecer de datos fiables sobre la anatomía de las manos en Las Sereas, clasificamos estas icnitas de Burgos como aff. Polyonyx. Los tres rastros saurópodos de Burgos se atribuyen a un mismo icnopoyeta, diferenciándose entre sí sólo por el tamaño, y sin que se haya detectado un comportamiento gregario. En el estudio de estos rastros pueden recogerse datos que informen sobre trayectos con cambio de dirección, incluso cuando lo que se conserva es una serie relativamente corta de pasos. En Las Sereas 7 la combinación de los valores de varios parámetros -longitud de paso (PL), pauta de anchura de angulación (WAP) y relación WAP/PL -y el estudio de la profundidad de las icnitas por fotogrametría permiten interpretar un cambio de dirección en dos de los rastros saurópodos. Este yacimiento y el de La Pedraja...

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Section: Geographical and Geological Settingsupporting

confidence: 75%

Unusual sauropod tracks in the Jurassic-Cretaceous transition. Cameros Basin (Burgos, Spain)

Fernández-Baldor¹,

Díaz-Martínez

Contreras³

et al. 2015

Journal of Iberian Geology

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“…Coated grains are very common in calcrete pro fi les (Calvet and Iulia, 1983;Hay and Wiggins, 1980), palustrine carbonates (Freytet and Plaziat, 1982;Alonso-Zarza et aL, 1992) and peritidal set tings (Mazzullo and Birdwell, 1989). The problem of the study of these coated grains starts with their classifi cation (Peryt, 1983;Richter, 1983).…”

Section: The Ooidsmentioning

confidence: 99%

Quaternary laminar calcretes with bee nests: evidences of small-scale climatic fluctuations, Eastern Canary Islands, Spain

Alonso-Zarza

Silva

2002

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…These depositional features fit well the ''low-gradient ramp-low energy'' model of Wright (1991, 1992). In the Rambla del Saltador, evidence of subaerial exposure of carbonate sediments is shown mainly by extensive root bioturbation leading to the development of prismatic structures and carbonate mounds (Freytet 1984;Calvo et al 1985;Alonso-Zarza et al 1992). Carbonate production was related mainly to extensive growth of charophytes and cyanobacteria, as well as gastropod and ostracod benthic faunas living in freshwater.…”

Section: Palustrine Carbonates and Marsh Depositsmentioning

confidence: 99%

“…Examples of the four types of carbonate lake margins have been documented from both modern lakes and the fossil record. However, although some of the resulting facies models have been supported by abundant case studies, for example, the low-energy ramp type (Brown and Wilkinson 1981;Freytet and Plaziat 1982;Wells 1983;Freytet 1984;Cabrera et al 1985;Alonso-Zarza et al 1992;Platt and Wright 1992;Armenteros et al 1997), documentation of the other types of lake margin is less common. In particular, models of the low-energy bench type are based on a few examples of modern North American lakes, i.e., Lake Littlefield (Murphy and Wilkinson 1980) and Sucker Lake (Treese and Wilkinson 1982), and from a single large-scale ancient example, the Lower Cretaceous Peterson Limestone of Wyoming and Idaho (Glass and Wilkinson 1980).…”

Section: Introductionmentioning

confidence: 99%

Architecture of a Bench-Type Carbonate Lake Margin and Its Relation to Fluvially Dominated Deltas, Las Minas Basin, Upper Miocene, Spain

Calvo¹,

Gómez‐Gras²,

Alonso-Zarza³

et al. 2000

Journal of Sedimentary Research

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The Upper Miocene stratigraphic succession of the Las Minas Basin, located at the external zone of the Betic Chain in SE Spain, preserves several examples of lake carbonate bench deposits. Excellent exposures of the carbonate benches allow detailed observation of the architecture of these sediments and provide new insights for the ''steep-gradient bench margin-low energy'' model proposed by Platt and Wright (1991). The lake carbonate benches developed in close association with fluvially dominated shallow deltas that exhibit typical Gilbert-type profiles. The delta sequences comprise bottomset prodelta marl facies, distal to proximal foreset facies, deposited mainly in a delta-front environment, and topset facies, the latter reflecting both subaqueous delta-front and subaerial delta-plain environments. The development of the carbonate benches was constrained by the convexupward morphology of the deltaic deposits, which led to the available accommodation space for the growth of the steep-gradient platforms. The benches display a progradational pattern characterized by sigmoid-oblique internal geometries and offlap upper boundary relationships, which suggests that the carbonate benches developed under slow though continuous lake-level rise. Both the dimensions of the benches and the dominant carbonate components (i.e., encrusted charophyte stems and calcified cyanobaterial remains), allow comparisons with the progradational marl benches recognized in modern temperate hardwater lakes. Accordingly, the case study presented here provides a good ancient sedimentary analog for low-energy lake carbonate benches. Moreover, the evolutionary trend inferred from the fossil example offers new insights into the depositional conditions of this type of sediment and allows recognition of the transitional pattern from bench to ramp carbonate lake margins.

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Palustrine sedimentation and associated features—grainification and pseudo-microkarst—in the Middle Miocene (intermediate unit) of the Madrid Basin, Spain

Cited by 111 publications

References 24 publications

Unusual sauropod tracks in the Jurassic-Cretaceous transition. Cameros Basin (Burgos, Spain)

Unusual sauropod tracks in the Jurassic-Cretaceous transition. Cameros Basin (Burgos, Spain)

Quaternary laminar calcretes with bee nests: evidences of small-scale climatic fluctuations, Eastern Canary Islands, Spain

Architecture of a Bench-Type Carbonate Lake Margin and Its Relation to Fluvially Dominated Deltas, Las Minas Basin, Upper Miocene, Spain

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