By J. E. Treagus (auth.), J. E. Treagus (eds.)
This quantity bargains with these websites chosen as a part of the Geological Conservation assessment (GCR) in the southern British a part of the Caledonides, that's, the paratectonic Caledonides - a Caledonian terrane with no powerful and pervasive deformation and metamorphism, corresponding to happened extra north. This orogenic belt shaped through lengthy and complicated tactics of earth events among 500 and 380 million years ahead of the current (?late Cambrian to mid-Devonian times), and has been vintage floor for geologists for 2 hundred years. it's maybe no twist of fate that James Hutton in 1795 selected to demonstrate his geostrophic cycle (and unconformity) with 3 visually particular examples of the deformation wrought on decrease Palaeozoic rocks through Caledonian occasions. the previous Caledonian mountain chain, which are noticeable this day in fragmented items in Scandinavia, Britain and eire, and North the USA, was once finally the results of the collision of 2 continental plates and the closure of a former ocean, Iapetus. a few of these fragments, together with these in Scandinavia, southern Britain, and the Republic of eire and the Maritime Provinces of Canada, are inspiration to have lain at the south facet of the sea earlier than collision: the remainder of North the US, northern eire, and Scotland are concept to have lain north of the previous Iapetus.
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Additional info for Caledonian Structures in Britain: South of the Midland Valley
At Whithorn Bay the plunge variations are on a larger scale and only become apparent from careful examination of successive outcrops. 1) across the Whithorn Peninsula, may be related to one or more strike-parallel thrusts. This site also reveals from examination of way-up criteria, the presence of an isoclinal fold which pre-dates D j . Such folds have been described from several localities in the Hawick Rocks; they have been interpreted as the products of soft-sediment deformation, developed early in the history of the accretionary prism.
Craig and Walton (1983) have defended their view. The typical features of the Dl deformation in the Hawick Rocks, seen in this site, are very similar to those in other adjacent Llandovery and the Wenlock formations. These features have also been described in papers by Stringer and Treagus (1980, 1981), where this section is mentioned in particular. Most of the characteristics of Southern Upland folding, described by Walton (1983), can be observed in this section. The typical features are: the wavelength, asymmetry, and plunge variations of the folds and the transection of these folds by the Sl cleavage.
They are interrupted by several zones, a few metres wide, of D1 folding. 5-1 m, generally plunge at gentle angles to the north-east, but also exhibit plunges up to 500 NE and 80oSW. The vergence of the folds, in the central outcrops, appears to be neutral, or to the south-east, and this supports the fragmentary evidence of northwesterly younging (assuming that the folds face up). 15 herein) interrupted by the southern fault (at point d) and separated from the succeeding greywackes; this is supported by the observation (McCurry, pers.
Caledonian Structures in Britain: South of the Midland Valley by J. E. Treagus (auth.), J. E. Treagus (eds.)