FACIES AND SEQUENCE CONTROLS ON THE APPEARANCE OF THE CAMBRIAN BIOTA IN SOUTHWESTERN MONGOLIA: IMPLICATIONS FOR THE PRECAMBRIAN-CAMBRIAN BOUNDARY

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dc.contributor.author Lindsay J.F.
dc.contributor.author Brasier M.D.
dc.contributor.author Dorjnamjaa D.
dc.contributor.author Goldring R.
dc.contributor.author Kruse P.D.
dc.contributor.author Wood R.A.
dc.date.accessioned 2020-12-01T08:37:39Z
dc.date.available 2020-12-01T08:37:39Z
dc.date.issued 1996
dc.identifier https://elibrary.ru/item.asp?id=13732560
dc.identifier.citation Geological Magazine, 1996, , 4, 417-428
dc.identifier.issn 0016-7568
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/20007
dc.description.abstract Neoproterozoic–Cambrian rocks of the Zavkhan Basin (Govi-Altay, western Mongolia) comprise large-scale alternations of siliciclastic- and carbonate-dominated units (cf. ‘Grand Cycles’). Analysis of such depositional sequences near the base of the Cambrian confirms that the distribution of trace fossils, small shelly fossils and calcimicrobial structures was strongly controlled by ecology and taphonomy, corresponding to specific points in a sea-level cycle. Evolution of the Cambrian biota is thus viewed through aseries of narrow time windows, once only for each depositional cycle. Correlation of the Precambrian–Cambrian boundary level on the basis of the first appearance of the Phycodes pedum assemblage is also fraught with difficulty, since stratigraphic resolution may be limited to a single sea-level cycle(c. 1–5 Ma). It is suggested that, in many cases, basin analysis will need to be undertaken before this boundary can be drawn.
dc.subject Precambrian en
dc.subject Cambrian en
dc.title FACIES AND SEQUENCE CONTROLS ON THE APPEARANCE OF THE CAMBRIAN BIOTA IN SOUTHWESTERN MONGOLIA: IMPLICATIONS FOR THE PRECAMBRIAN-CAMBRIAN BOUNDARY
dc.type Статья
dc.subject.age Paleozoic::Cambrian en
dc.subject.age Precambrian en
dc.subject.age Палеозой::Кембрийская ru
dc.subject.age Докембрий ru


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