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- W1546199545 abstract "UPPER ORDOVICIAN CRYPTOSTOMATID BRYOZOANS AND MICROFOSSILS FROM THE DON BRAULIO FORMATION, EASTERN PRECORDILLERA, ARGENTINA: In the classical section of the Don Braulio Creek at the Villicum Range, Eastern Precordillera of San Juan Province, crops out the siliciclastic Don Braulio Formation of Hirnantian age. Fragments of bryozoan colonies, few poorly preserved sponge spicules and a crinoidal plate, were recovered from these shelf sediments. The bryozoan colonies remains are characterized by its erect growth habit, its small diameter, and for showing clear longitudinal striations. These fragments have a poor preservation, but they have been compared with the genus Nematopora belonging to the Arthrostylidae family (Rhobdomesina suborder, Cryptostomata order), that had numerous representatives during the Ordovician. Very scarce and highly fragmented sponge spicules are classified as hexactins. These microfossils have been recovered in the post-glacial deposits from the Don Braulio section at the Villicum range. Resumen: BRYOZOOS CRYPTOSTOMATIDOS Y MICROFOSILES DE LA FORMACION DON BRAULIO, ORDOVICICO SUPERIOR, PRECORDILLERA ORIENTAL, ARGENTINA: En la clasica seccion de la Quebrada de Don Braulio, en la Precordillera Oriental de la Provincia de San Juan, aflora la Formacion Don Braulio de edad hirnantiana. Fragmentos de colonias de Bryozoos,algunas espiculas de esponjas mal conservadas y una placa de crinoideos, fueron recuperados de los sedimentos silicoclasticos de esta formacion. Los restos de las colonias de briozoos se caracterizan por su habito de crecimiento erecto, su diametro pequeno y por la presencia de estriaciones longitudinales. Estos fragmentos tienen una pobre preservacion, sin embrago los mismos han sido comparados con el genero Nematopora perteneciente a la familia Arthrostylidae (suborden Rhobdomesina, orden Cryptostomata), que tuvo numerosos representantes durante el Ordovicico. Escasas y fragmentadas espiculas de esponja hexactinellidas y otros tipos de microfosiles tambien han sido recuperados de los depositos post-glaciales de la Formacion Don Braulio." @default.
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- W1546199545 date "2014-06-01" @default.
- W1546199545 modified "2023-10-09" @default.
- W1546199545 title "Upper Ordovician cryptostomatid bryozoans and microfossils from the Don Braulio Formation, Eastern Precordillera, Argentina" @default.
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