ABSTRACT Palynomorph assemblages from the Upper Jurassic, fault -controlled submarine slope depos... more ABSTRACT Palynomorph assemblages from the Upper Jurassic, fault -controlled submarine slope deposits, of east Sutherland have yielded miospores and microplankton in varying abundances. The Adnatosphaeridium caulleryi group, Cribroperidirrium spp. and Cyolonephelium hystrix are abundant throughout the section: Shorter-ranging taxa include Cribroperidinium longicorne, Dichadogonyaulax? pannea, Egmontodinium expiratum, Gochteodinia mutabilia, Kleithriasphaeridium porosispinum, Oligosphaeridium pulcherrimum sense Ioannides et AI. 1977 and Senoniasphaera iurassica. The base of the Pavlovia rotunda and the top of the Virgatopavlovia fittoni ammonite zones are recognized by the appearance of MUderongie sp.A Davey 1979 and the extinction of Dingodinium tuberosum and Occisucysta balia respectively. The youngest rocks exposed are assigned to the Progalbanites albani ammonite Zone of the Lower Portlandian. Increase in the ratio of microplankton to miospores in the Upper Kimmeridgian and Lower Portlandian is interpreted as indicating increasing distance from the terrestrial source due to fault-controlled widening of the submarine shelf.
Silurian successions in the Midland Valley of Scotland record the infilling of a Llandovery-Wenlo... more 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 Inli...
ABSTRACT Palynomorph assemblages from the Upper Jurassic, fault -controlled submarine slope depos... more ABSTRACT Palynomorph assemblages from the Upper Jurassic, fault -controlled submarine slope deposits, of east Sutherland have yielded miospores and microplankton in varying abundances. The Adnatosphaeridium caulleryi group, Cribroperidirrium spp. and Cyolonephelium hystrix are abundant throughout the section: Shorter-ranging taxa include Cribroperidinium longicorne, Dichadogonyaulax? pannea, Egmontodinium expiratum, Gochteodinia mutabilia, Kleithriasphaeridium porosispinum, Oligosphaeridium pulcherrimum sense Ioannides et AI. 1977 and Senoniasphaera iurassica. The base of the Pavlovia rotunda and the top of the Virgatopavlovia fittoni ammonite zones are recognized by the appearance of MUderongie sp.A Davey 1979 and the extinction of Dingodinium tuberosum and Occisucysta balia respectively. The youngest rocks exposed are assigned to the Progalbanites albani ammonite Zone of the Lower Portlandian. Increase in the ratio of microplankton to miospores in the Upper Kimmeridgian and Lower Portlandian is interpreted as indicating increasing distance from the terrestrial source due to fault-controlled widening of the submarine shelf.
Silurian successions in the Midland Valley of Scotland record the infilling of a Llandovery-Wenlo... more 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 Inli...
Uploads
Papers by Hugh Barron