Thesis Collection
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Browsing by Author "Valenzuela, M."
Now showing items 1-6 of 6
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Ambientes sedimentarios, significado paleoecológico y fosilización de icnitas de dinosaurios. Yacimientos del Jurásico de Asturias
(Sociedad Geológica de España, 1992)Upper Jurassic dinosaur tracks of Asturias (N Spain) are confined to the La Nora, Vega, Terehes and Lastres Formations. The Jurassic record of this area indicates the occurrence of large and diverse populations including ... -
Aportaciones para la interpretación de Zoophycos
(Sociedad Geológica de España, 1993)Recent discoveries of well-preserved Zoophycos specimens in Eocene turbidite sediments W of Jaca (Southern Pyrenees), have permitted the confirmation of polemical data infered by Kotake (1989) concerning to the behaviour ... -
Características geoquímicas preliminares de azabaches artesanales del Kimmeridgiense de Asturias
(Sociedad Geológica de España, 1996)The soluble organic m a tte r o f the Kim meridgian Asturias j e t has been studied b y gas chrom atography/ mass spectrometry. The sample was obtained by extractive sonication with carbon disulfide as solvent. The q ... -
Los depósitos de hierro oolítico del Paleozoico de Asturias y N de León: ambiente de depósito y relación con el vulcanismo
(Sociedad Geológica de España, 1987)The depositional setting of the Palaeozoic oolitic iron formations of the Cantabrian Mountains is proposed. They acumulated in a shallow sublittoral environment influenced by the repetitive alternation of siliciclastic ... -
Hardgrounds a techo de ciclos de somerización y ralentización en una rampa carbonatada del Lías de Asturias
(Sociedad Geológica de España, 1991)Marl-limestone rhythmic successions are common in the Liassic sections along a part of the Asturian coast (N Spain). The Upper Sinemurian nodular beds show several hardground levels capping asymmetric aggradationa/ cycles ... -
Icnofósiles, sedimentación episódica/ tempestitas fangosas y «black shales» de ambientes seudoanóxicos, en sucesiones marinas de plataforma y rampa
(Sociedad Geológica de España, 1992)Déposition of blade shale fades on marine shelves and ramps has been habitually attributed to several causes related to oxygen-depleted bottom waters: sea level fluctuations, very slow water circulation, high organic ...
