Silurian palynology and correlation of inliers in the Midland Valley of Scotland

Molyneux, Stewart; Barron, Hugh; Smith, Richard. 2001 Silurian palynology and correlation of inliers in the Midland Valley of Scotland. [Lecture] In: Palaeozoic Palynology in the Third Millenium : new directions in acritarch, chitinozoan and miospore research., Lille, France, Sept 2001. Commission Internationale de Microflore du Paleozoique.

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Silurian palynology and correlation of inliers in the Midland Valley of Scotland Stewart Molyneux1, Hugh Barron2 and Richard Smith2 1British Geological Survey, Keyworth, Nottingham NG12 5GG, U.K. 2British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, U.K. Silurian successions in the Midland Valley of Scotland record the infilling of a Llandovery-Wenlock basin, but differences of detail between Silurian inliers suggest the presence of local sub-basins with different histories of sedimentation. Unravelling the sedimentary and tectonic history of the Midland Valley depends on correlation between the inliers. Llandovery marine facies have yielded graptolite and shelly faunas, and both have been used for correlation, but marine palynomorphs (acritarchs, chitinozoa) are also present. In the North Esk Inlier, the lowest palynological assemblage, from the late Llandovery Reservoir Formation, is reasonably diverse, but dominated by sphaeromorph acritarchs and species of Tylotopalla (T. deerlijkianum, T. astrifera). The assemblage suggests a comparatively shallow marine environment, consistent with interpretation of the graptolite fauna. The sphaeromorph-Tylotopalla assemblage also occurs in the Drumyork Flags Formation of the Girvan Main Inlier, at about the same chronostratigraphic level. Overlying successions in the North Esk and Girvan Main inliers have yielded marine assemblages of lower diversity. Assemblages from the highest formation in the North Esk Inlier, the non-marine Henshaw Formation of Wenlock age, comprise mainly cryptospores and simple trilete spores (Ambitisporites), in contrast to the marginal marine assemblage from the Straiton Grits Formation of Wenlock age at Girvan.

Item Type: Publication - Conference Item (Lecture)
Programmes: BGS Programmes > Geology and Landscape Northern
NORA Subject Terms: Earth Sciences
Date made live: 10 Aug 2012 12:18 +0 (UTC)

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