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NARROW
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Burway Formation
Specimens of Intrites punctatus from the Burway Formation and Lightspout ...
Medusinites aff. asteroides from the upper part of the Burway Formation ...
Fossils and matgrounds from the Neoproterozoic Longmyndian Supergroup, Shropshire, UK
The dynamic influence of microbial mats on sediments: fluid escape and pseudofossil formation in the Ediacaran Longmyndian Supergroup, UK
Abstract Simple discoidal impressions are the only evidence of complex life in some Ediacaran and older rocks, but their interpretation is notoriously difficult. We reassessed a puzzling discoidal form from the c. 560 Ma upper Burway Formation of the Ediacaran Longmyndian Supergroup, Shropshire, UK. The structures, previously described as Intrites punctatus Fedonkin, are found on both the bed tops and soles. They vary in morphology from mounds with central depressions to incomplete rings and pairs of short ridges. Examination of the purported Intrites documented from the Longmyndian in cross-section revealed a torus-shaped structure bounded by microbial mat layers and commonly containing white laminae. We interpret the ‘Longmyndian Intrites ’ as a product of microbial trapping, sediment binding and authigenic clay mineral and carbonate precipitation on the flanks of small sediment volcanoes. Subsidence of the ring-like structure into muddy sediments resulted in a torus-shaped microstromatolite. Preferential stromatolitic growth parallel to the prevailing current produced the observed partial rings or parallel ridges and explains their preferential orientation as current alignment. This interpretation of ‘Longmyndian Intrites ’ expands the known variety of microbially-induced sedimentary structures (MISS) and emphasizes the importance of considering microbially-induced structures and abiological processes when interpreting discoidal impressions in ancient rocks. Gold Open Access: This article is published under the terms of the CC-BY 3.0 license .
Morphology of Beltanelliformis brunsae from the top of the Burway Formati...
Schematic 3D representation of the proposed model for the formation of Med...
Microbial filaments preserved in aluminosilicate minerals from the Burway F...
A solution to Darwin's dilemma of 1859: exceptional preservation in Salter's material from the late Ediacaran Longmyndian Supergroup, England
New isotopic age data on rocks from the Long Mynd, Shropshire
U–Pb zircon–rutile dating of the Llangynog Inlier, Wales: constraints on an Ediacaran shallow-marine fossil assemblage from East Avalonia
Provenance of the pre-Devonian sediments of England and Wales: Sm-Nd isotopic evidence
The age and nature of the basement of southern Britain: evidence from Sr and Pb isotopes in granites
Abstract This chapter considers the Precambrian rocks that lie beneath Lower Palaeozoic strata in England and Wales, but excludes the Monian rocks exposed in Anglesey and the Llŷn Peninsula in northwest Wales (see Chapter 9). It includes the Sam Complex on Llŷn because these rocks lie immediately southeast of the Menai Strait Fault System, and they show close similarities to other basement inliers further south and southeast. Although all these rocks are grouped as late Proterozoic, given the uncertainties associated with defining the chronostratigraphical base of the Cambrian, combined with the paucity of reliable isotopic data, it is possible that some are of early Cambrian age.
Martin Brasier’s contribution to the palaeobiology of the Ediacaran–Cambrian transition
Abstract Martin Brasier’s work spanned almost the entire geological column, but the origin of animals and the nature of the Cambrian explosion were areas of particular interest to him. Martin adopted a holistic approach to the study of these topics that considered the interplay between multiple geological and biological phenomena and he sought to interpret the fossil record within the broad context of geological, biogeochemical and ecological changes in the Earth system. Here we summarize Martin’s main contributions to this area of research and assess the impact of his findings on the development of this field.