Abstracts

Earth sciences

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Discussion on Late Precambrian tectonothermal evolution of the Malverns Complex

Article Abstract:

The tectonothermal evolution of the Malverns Complex has been investigated. The provenance of derital grains in the basal Cambrian sequence has been constrained. The more than 600 Ma ductile deformation of the plutonic igneous rocks of the Malverns is found to predate the development of the latest Proterozoic terrane boundary supported by Pharaoh et al (1994). The presence of a Precambrian terrane boundary along the Malverns Lineament is doubted due to contrasts between the structural style of the lineament and the ductile property of the late Precambrian terrane boundaries in related Avalonian-Cadomian areas.

Research, Geodynamics

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Changes in the trace fossil biota across the Proterozoic-Phanerozoic boundary

Article Abstract:

A study was conducted to evaluate the evolution of trace fossil variations during the Proterozoic-Phanerozoic transition. It is shown that these fossils exhibited such diversity in shallow-water clastic seas during the late Proterozoic and increased its abundance and complexity for the Tommotian and Atdabanian stages. Possible world-wide correlation for three trace fossil zones is established for the Redkino and Kotlin, Rovno and Tommotian-lower Atbadanian ranges.

Trace fossils

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Vendobionta and Psammocorallia: lost constructions of Precambrian evolution

Article Abstract:

An analysis of the evolution of Precambrian organisms is presented. The absence of biomineralized skeletons and low predation made Vendian evolution pass through diverse channels. It is shown that Vendobionta is characteristic of a kingdom where skin quilting conditioned foliate shapes, large sizes and compartmentalization. On the other hand, Psammocorallia represent coelenterates with internal sand skeletons.

Fossils

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