The stratigraphy, classification and correlation of the marine strata in the Dinantian (Lower Carboniferous) succession of central Scotland are discussed. Correlations of eight principal marine bands in the upper part of the sequence are proposed and four Hosie limestones are recognised in Fife. The marine macrofossils are listed and their vertical and lateral distribution discussed. Biofacies maps of the main marine faunas are presented, which indicate an eastern origin for the marine transgressions and suggest the existence of a river entering the region to the N of Glasgow. Observations are made on the range of host-sediments in which the most commonly occurring genera are found and palaeoecological interpretations are made concerning the main components of the faunas. Some evidence is given to suggest that some elements of the faunas migrated into the region from the E. The palaeogeography is discussed and a correlation is outlined between epifaunal forms at some horizons and areas of less subsidence in the general regional pattern of differential subsidence.
Synopsis
A critical review is made of the evidence for correlating the Lower Carboniferous marine limestones of the upper Calciferous Sandstone Measures and Lower Limestone Group of the Paisley area with those of North Ayrshire. Of the three different schemes of correlation made in the past, one is supported by recently acquired palaeontological information from IGS boreholes. The main conclusion reached is that the Hurlet and Blackhall limestones of the Paisley area are respectively equivalent to the Broadstone and Dockra limestones of Ayrshire so that the base of the Lower Limestone Group should be drawn at the base of the Broadstone Limestone.
SynopsisThe marine invertebrate macro-fossils of the principal marine bands of Namurian age in Central Scotland are described. The species identified are listed and the vertical and lateral distributions of some species within the region are discussed together with notes on the palæogeography and palœoecology. Notes on the morphology of certain species are given and Campylites carbonarius (McCoy), Dyscritella leei sp. nov., Koninckopecten gen. nov. (type species Limatulina scotica Hind), Myalina mitchelli sp. nov., Palœoneilo mansoni sp. nov., Paleyoldia macgregori sp. nov. and Schizodus portlocki (Brown) are described.
The results of various photogeological, geological and geophysical programmes in the Mootwingee Area of northwestern New South Wales are discussed.In a structurally complex area, a central horst of outcropping Precambrian rocks trends north-northwestwards. This is flanked both to the east and west by basins containing considerable thicknesses of Palaeozoic sediments.The problem of whether the western structural basin, now represented by the Topar syncline, is coincident with the Cambro-Ordovician basin of sedimentation (?Bancannia Trough) is also discussed. The presence of infolded and down-faulted remnants of Cambro-Ordovician sediments within the Precanibrian basement, to the north of the area discussed, suggests that Cambro-Ordovician sedimentation may have extended further eastward than is now revealed in outcrop.The main source-potential of the area appears to be confined to the Cambro-Ordovician sequence with perhaps very limited potential in the thick Devonian sediments. The drilling of a stratigraphic well in each of the basinal areas respectively to the west and east of the centrally-outcropping Precambrian block, appears justified. Such drilling should resolve some of the above-mentioned problems of depositional limits, as well as assist in evaluating the petroleum potential of the region.
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