doi: 10.1130/G25637.1 2010;38;143-146 Geology Francis A. Macdonald, Phoebe A. Cohen, Francis O. Dudás and Daniel P. Schrag and the Yukon Territory Early Neoproterozoic scale microfossils in the Lower Tindir Group of Alaska Email alerting services articles cite this article to receive free e-mail alerts when new www.gsapubs.org/cgi/alerts click Subscribe to subscribe to Geology www.gsapubs.org/s...

Two separate and distinct diamictite-rich units occur in the mixed carbonate-siliciclastic PolarisbreenGroup, which comprises the top kilometer of47 km of Neoproterozoic strata in the northeast of the Svalbard archipelago.The platformal succession accumulated on the windward, tropical to subtropical margin of Laurentia.The older PetrovbreenMember is a thin glacimarine diamictite that lacks a ca...

Laterally extensive black shales were deposited on the São Francisco craton in southeastern Brazil during low-latitude Neoproterozoic glaciation approximately 740 to 700 million years ago. These rocks contain up to 3.0 weight % organic carbon, which we interpret as representing the preserved record of abundant marine primary productivity from glacial times. Extractable biomarkers reflect a comp...

With the targets of petroleum exploration transferred to deep and ancient strata, abundant oil gas resources have been found in Lower Paleozoic older strata central western China. Due complex evolutionary processes including multiple episodes hydrocarbon accumulation ubiquitously accompanied by secondary alterations, significant uncertainties remain concerning generation time these revealed sou...

Abstract There are current debates around the extent of global ocean oxygenation, particularly from late Neoproterozoic to early Paleozoic, based on analyses various geochemical indices. We present a temporal trend in excess barium (Baexcess) contents marine organic-rich mudrocks (ORMs) provide an independent constraint redox evolution. The absence remarkable Baexcess enrichments Precambrian (&...