Repositorio Digital Sernageomin
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    Evaluación de peligro de remoción en masa en calle Clemente Escobar, comuna de Valdivia, Región de Los Ríos

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    Revisor: Carlos Johnson N. ; Informe Técnico19 p

    Evaluación de peligro de remoción en masa en ladera del estero Cudico, comuna de Panguipulli, Región de Los Ríos

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    Revisores: Paola Ramirez y Carlos Johnson ; Informe Técnico21 p

    Evaluación geológica de puntos de encuentro transitorio en las comunas de Pinto, Coihueco y San Fabián en caso de erupción del complejo volcánico Nevados de Chillán, región del Ñuble

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    Informe Técnico -- Unidad Ejecutora: Unidad de Geología y Peligros de Sistemas Volcánicos, Santiago88 p

    Modelación 2D de anomalías gravimétricas en localidades de Pomaire, Santa Elvira y Melipilla, Región Metropolitana

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    Informe Técnico -- Unidad Ejecutora: Unidad de Geofísica del Departamento de Geología General. Santiago23 p

    Biostratigraphic and paleobiogeographic significance of the Darriwilian microfossils from the top of San Juan Formation in the Los Baños de Talacasto section, Central Precordillera (Argentina)

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    The microfossil hosted in the strata of the upper part of the San Juan Formation has been widely studied in several sections to the northward of the Argentinian Central Precordillera. In contrast, the coeval strata at the Los Baños de Talacasto section, in the southern part of the Central Precordillera, have scarce biostratigraphic and sedimentological data. In this work, a conodont association together with single ostracod species are documented for the first time in this section. The record of the Lenodus crassus and L. pseudoplanus zones confirms the Darriwilian age for these beds and accurately correlates them with equivalent strata of the San Juan Formation studied in several sections of the Central and Eastern Precordillera. The microfacies analysis verifies the presence of Nuia síbirica Maslov, 1954, peloids, intraclasts, cyanobacteria, calcareous algae, and a possible microbialite indicating a shallow warm-water subtidal environment, in equatorial to subequatorial climate. This suggests a low latitudes position for Precordillera during the early-middle Darriwilian. The conodont genus Aurilobodus Xiang and Zhang is recognized for the first time from the Precordillera, and the Aurilobodus leptosomatus An specimens are described and illustrated. This genus shows affinities to the warm water in shallow marine environments of North China, Central Asia, South Tibet, western Thailand, Australia, and Newfoundland, suggesting probable ties between Precordillera and these regions. The record of the ostracod Pilla nodospinosa Salas in the study section would agree with the correlation of the top of San Juan Formation with the lower levels of the Las Aguaditas Formation in the Central Precordillera, and also suggests paleobiogeographic links with Eastern Gondwana and Australia regions during the Darriwilian times.pp.423-44

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