Results 81 to 90 of about 7,444 (188)
Catastrofismo versus actualismo : implicaciones didácticas [PDF]
, 1992 This paper analises the historic evolution of the «actualist» and "catastrophist" geologic interpretations, describes posible epistemologic obstacles and considers their treatment in the Secondary ...
Pedrinaci Rodríguez, Emilio
core +2 more sources
Microbial mats in dinosaur ichnocoenoses
Sedimentology, EarlyView.ABSTRACT Until now, the significance of microbial mats in preservation of dinosaur tracks and in reconstructing the palaeoenvironment in which dinosaurs roamed was rarely studied. Dinosaur tracks are commonly found close to ancient aquatic bodies where moist sediment had once allowed footstep registration.
Nora Noffke +3 more
wiley +1 more source
Evolución diagenética en los sedimentos carbonatados marinos del Pleistoceno de Mallorca [PDF]
, 1977 not ...
Calvet Rovira, Francesc +1 more
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Sedimentology, EarlyView.ABSTRACT This research examines the spatial and geochemical interactions between mat‐forming microorganisms and thalassinid shrimp in an intertidal flat situated on the shores of Willapa Bay, Washington, USA. The study serves as a contemporary analog for the relationships between mats and burrowing organisms in deep time.
Brette S. Harris +9 more
wiley +1 more source
Consideraciones sobre la diagénesis y velocidad de racemización de aminoácidos de fósiles del Cuaternario. [PDF]
, 1997 En este trabajo se describen las alteraciones de los contenidos en aminoácidos de fósiles del Cuaternario, que resulta ser dependiente del tiempo. También se citan algunos casos en los que se ha podido determinar diferencias en la velocidad de la ...
Torres Pérez-Hidalgo, Trinidad José
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Age at death estimation in neanderthals by means of histomorphometry [PDF]
, 2015 Comunicación presentada en el XIII Encuentro en Jóvenes Investigadores en Paleontología (XIII EJIP) - XIII Meeting of Early-Stage Researchers in Paleontology (XIII EJIP): Cercedilla, 15 - 18 de Abril de 2015Financiación procedente del MINECO (CGL2012 ...
Bañuelos, Laura +2 more
core +1 more source
Sedimentology, EarlyView.ABSTRACT Thin ferruginous sandy crusts are common on top of sandstone beds in the Early Permian post‐glacial deposits of the Paraná Basin in southern Brazil. These crusts usually preserve wrinkle structures, suggesting that they might be a product of microbial mediation.
Patrícia Weschenfelder +2 more
wiley +1 more source
Sedimentology, EarlyView.ABSTRACT Continental margins are reservoirs of materials of terrestrial and marine origin, and they play a crucial role in understanding the spatial and temporal variability of biogeochemical cycles. This, in turn, provides insights into the development and intensity of oxygen minimum zones (OMZs).
Alberto Sánchez
wiley +1 more source
Comportamiento de las rocas cuarcíticas de las sierras septentrionales (Tandil) frente a la RAS [PDF]
, 2015 Uno de los temas más investigados vinculado a la durabilidad de las estructuras de hormigón es la reacción álcali-sílice (RAS), ya que esta reacción se produce dentro del hormigón y provoca fallas ...
Coelho Dos Santos, Gabriela
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Spherulite in the modern aragonitic travertine stromatolite has a calcite core with exopolymers
Sedimentology, EarlyView.ABSTRACT Spherulites are spherical to ellipsoidal particles formed by various crystalline substances and can be abiotically synthesised in the laboratory. Among various spherulite types, spherulites composed of calcium carbonate are also found in various natural environments, but their abiotic or biotic origins are still controversial.
Fumito Shiraishi +4 more
wiley +1 more source