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Nuevos yacimientos fósiles de esquisto de Burgess revelan el complejo faunístico del Cámbrico Medio

D Collins, D Briggs, S C Morris

Science (New York, N.Y.)

|October 14, 1983

Resumen

Los nuevos yacimientos fósiles de esquisto de Burgess Shale en las Montañas Rocosas canadienses revelan cinco comunidades marinas distintas. Estos ensamblajes fósiles representan un complejo faunal de arrecife anterior normal de la Formación Stephen del Cámbrico Medio.

Área de la Ciencia:

Paleontología Paleontología.
La estratigrafía es la estratigrafía.
Geología sedimentaria Geología sedimentaria.

Sus antecedentes:

Los fósiles de Burgess Shale son conocidos por la preservación de organismos de cuerpo blando.
La Formación Stephen en las Montañas Rocosas canadienses es una unidad geológica clave para los descubrimientos de fósiles del Cámbrico.

Objetivo del estudio:

Para informar sobre el descubrimiento de nuevas localidades fósiles.
Para caracterizar los ensamblajes fósiles y su importancia paleoecológica.

Principales métodos:

Cartografía geológica y prospección a lo largo de la Escarpa de la Catedral.
Colección y análisis sistemáticos de especímenes fósiles.
Análisis estratigráfico de capas que contienen fósiles.

Principales resultados:

Descubrimiento de más de una docena de nuevas localidades fósiles que se extienden 20 km.
Identificación de cinco conjuntos fósiles distintos desde cuatro niveles estratigráficos.
Reconocimiento de estos conjuntos como un complejo normal de fauna de arrecife.

Conclusiones:

Las nuevas localidades amplían significativamente la distribución conocida de los fósiles del tipo Burgess Shale.
Los conjuntos identificados proporcionan información sobre los ecosistemas marinos del Cámbrico Medio.
Este descubrimiento mejora nuestra comprensión de los entornos de arrecifes del Cámbrico.

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