The Hebridean terrane

Structure and stratigraphy of the Morar Group in Knoydart, NW Highlands: implications for the history of the Moine Nappe and stratigraphic links between the Moine and Torridonian successions

“…The area is structurally overlain by the ductile (~ amphibolite-facies) Sgurr Beag Thrust (Tanner 1971;Roberts et al 1987). To the west, the Caledonian Foreland and the Moine Thrust Zone in the footwall of the Moine Thrust contains a tripartite sequence comprising Archaean gneiss basement (the Lewisian Gneiss Complex); Meso-to Neoproterozoic siliciclastic sedimentary rocks (the Stoer, Sleat and Torridon groups); and a Cambro-Ordovician sedimentary succession (Peach et al 1907;Park et al 2002;Stewart 2002;Kinnaird et al 2007). The Moine Thrust Zone on the Isle of Skye, west of Knoydart, is dominated by Sleat and Torridon group strata folded in the large-scale recumbent Lochalsh Syncline (e.g.…”

The Laxford Shear Zone: an end-Archaean terrane boundary?

“…The 'Scourian' event was 67 later renamed 'Badcallian' (Park, 1970) and more tightly defined as a period of early 68 granulite-facies metamorphism, which has to date only been recognised in the central 69 district of the Lewisian Gneiss Complex. 70 Over the last hundred years, the Lewisian Gneiss Complex has provided a natural 71 laboratory for studies into many aspects of basement geology (Park et al 2002;72 Wheeler et al this volume). Major crustal-scale shear zones within the Lewisian 73 gneisses have been studied in detail, and provide large-scale examples of the type of 74 central district (Evans, 1965), Holland (1966) …”

Laurentian margin evolution and the Caledonian orogeny—A template for Scotland and East Greenland

“…The Ardvreck Group sediments are conformably but sharply overlain by 900 m thickness of Durness Group dolostone with limestone and minor chert (Ghrudaidh to Durine formations, Fig. 6) which accumulated on a low energy shelf (Park et al, 2002). From this change onwards, sedimentation in peri-and subtidal environments continued into the Middle Ordovician (Wright and Knight, 1995) and thus we see Greenland-style passive subsidence and a broad platformal shelf extending across inboard parts of the Scottish sector (cf.…”

“…The lower siliciclastic formations contain distinctive Skolithos burrows ('Piperock') and pass up into dolomitic siltstone with minor limestone containing diverse macrofaunal assemblages and Planolites burrows (Park et al, 2002).…”