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Abstract: The taxonomy, biostratigraphical and palaeogeographical distribution of the Lower Ordovician graptolite genus Bryograptus is evaluated. Bryograptus is recognized as a distinct triradiate anisograptid with a multiramous, pendent rhabdosome. The species of the genus Bryograptus can be interpreted as shallow water faunal elements with a strongly limited biogeographical distribution to the...
Se da a conocer la Biozona de Paraglossograptus tentaculatus en la Formatión Sierra de La Invernada,Precordillera Occidental sanjuanina, Argentina. Esta biozona, en base a sus asociaciones, fue dividida en parte inferior y parte superior. La edad de los afloramientos estudiados comprende et Arenigiano tardio — Llanvirniano temprano. Se discute là distributión vertical de los taxones, la asociación...
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