2024/02/19 - The Arden Sandstone Formation of the English West Midlands скачать в хорошем качестве

2024/02/19 - The Arden Sandstone Formation of the English West Midlands

This talk was given at a BCGS meeting on 19th February 2024. Entitled 'A very British summer in the late Triassic: the Arden Sandstone Formation of the English West Midlands and the dawn of the dinosaurs', the speaker was Prof. Stuart Burley (Director at Discovery Geoscience in the UK, Emeritus Chair at the Department of Geology and the Environment at Keele University). The Arden Sandstone Formation of central and western England is a thin but conspicuous arenaceous unit within the Late Triassic Mercia Mudstone Group. Sedimentological and palaeontological data point to lacustrine depositional conditions, in contrast to the red desert mudstones above and below which were deposited as continental dry land desert floodplains. The Arden Sandstone records deposits of the lake margins and may be the high stand lateral equivalent of the halite and gypsum deposits which formed in the lake centre. The Carnian age of the Arden Sandstone potentially links it to the Carnian Pluvial Episode, marking the coalescence, spread and freshening of the formerly saline desert lakes, and deposition of sandy, fluvial and lacustrine deposits during the wetter climate that prevailed for at least a million years.