Discussion on chemostratigraphy of predominantly siliclastic neoproterozoic successions: a case study of the Pocatello Formation and Lower Brigham Group, Idaho, USA

Article Abstract:

G. Shields criticized the research work of Smith et al. (1994) as inaccurate due to data misinterpretation. Their conclusions did not correlate with the results of other geologists on precambrian sediments. The isotope dating of Sr and delta C carbonate values by Smith et al. indicated that the samples belong to the post-Varanger age. Smith et al. replied that G. Shields' interpretation of Sr-isotopic data and their data are both inconsistent with post-Varanger sedimentation. Further data analysis indicate that the samples belong to the post-Sturtian period.

Analysis, Geological research, Proterozoic Eon, Geological time, Geochronology

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The Neoproterozoic to early Cambrian in southwest Mongolia: an introduction

Article Abstract:

A group composed of Soviet, Mongolian, Swedish and British scientists made two separate expeditions to the Govi-Altay region of Southwest Mongolia. The first one was made in 1991 while the latter was conducted in 1993. The group sought to discover the evolution of the biosphere and lithosphere over the Neoproterozoic-Cambrian interval. Southwest Mongolia was deemed the ideal site for this research since the Govi-Altay region's sections are thick, complete, well exposed and correlatable with the classic sections of the Siberian platform.

Natural history, Mongolia, Cambrian period

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Discussion

Article Abstract:

An argument on the origin of the Bigganjargga tillite in Finnmark, Norway is presented. M.B. Edwards contradicts interpretations made by P.A. Jensen and E. Wulff-Pedersen on the origin of the tillite, arguing that it is an outcrop of a glacially-scoured palaeovalley. P.A.Jensen and E. Wulf-Pedersen contend that their interpretations were based on the size of imprints on the tillite and on the imprints made by debris flows into the substrate.

Origin, Glaciers, Moraines

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