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Microfossils and Precambrian iron-formations

LABERGE, G.L

Geological Society of America bulletin, 1967-01, Vol.78 (3), p.331-342 [Periódico revisado por pares]

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Título:
Microfossils and Precambrian iron-formations
Autor: LABERGE, G.L
Assuntos: Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Paleobotany ; Paleontology
É parte de: Geological Society of America bulletin, 1967-01, Vol.78 (3), p.331-342
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição: Petrographic studies reveal that structures of possible organic origin and those believed to be relict microfossils are extremely abundant in many Precambrian iron-formations in the United States, Canada, Australia, and South Africa. The structures are mainly spheroids and ellipsoids that range from about 5-40 mu in diameter. Particular forms, however, usually have a narrower size range. Some of the structures appear to be similar to certain forms reported by Barghoorn and Tyler (1965) from the Gunflint chert; others presumably are new forms not previously reported. Particular types of structures are present in widely separated districts, indicating a wide geographic distribution. Certain distinctive forms occur in several Proterozoic iron-formations in North America and in an Archean iron-formation in Australia. Other forms occur in iron-formations from the Mesabi Range, Minnesota, and Belcher Islands and Lake Albanel, Canada.
Editor: Boulder, CO: Geological Society of America
Idioma: Inglês

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