By A. D. Stewart
The Torridonian sediments shaped in a Proterozoic rift approximately contemporaneous with the Keweenawan Supergroup of North the United States. The e-book includes the 1st whole box description of rocks and sedimentary environments within which they shaped, including a accomplished exam in their tectonic, palaeoclimatic value, palaeomagnetism and diagenesis. It comprises the result of over 40 years paintings by way of the writer, such a lot of it formerly unpublished.
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Extra info for Later Proterozoic Torridonian
The finer grain-size of the formation probably results from a greater distance from the source, for the zircons it contains are more abraded than those in the Applecross Formation (Rainbird et al. 2001). The Aultbea is unlikely to have come from erosion of the Applecross because the source areas of the two formations were distinctly different (Fig. 30). Some progress has been made by Nicholson (1993) in establishing the palaeohydrological regime of Applecross rivers. The bankfull discharges (Qb) of 300-3000 m3 s"1 he estimated are, however, difficult to interpret.
Four of the five facies defined at Cape Wrath by Williams (1969a) are 34 THE TORRIDON GROUP from sediments too coarse to be representative of the sediments farther south. Only the finest facies at Cape Wrath (Fig. 40), which is the only one strongly contorted, has anything in common with the Applecross Formation as a whole. Selley (1965a, 1969, 1970) and Williams (\966c, \969a, 2001) noted the following environmentally significant features in the pebbly Applecross Formation: • • • • • low palaeocurrent variance; medium to coarse grade sediment with virtually no silt or mud; common trough cross-bedding in sets 10-100 cm thick, and planar cross-bedding in sets 30-200 cm thick; channels 1-2 m deep; absence of fining-upward cyclicity typical of meandering rivers.
Toscaig; f, Raasay; g, Shieldaig to Applecross; h, Torridon, east of the Fasag fault; i, Torridon west of the Fasag fault; k, Gairloch; 1, Aultbea; m, Cailleach Head; n, Scoraig to Dundonnell; o, Isle Ristol to Badentarbat; p, Achiltibuie to Strath Kanaird; q, Rubha Stoer, west and east of the Coigach fault; r, Handa; s. Cape Wrath. The palaeomagnetic stratigraphy is shown with SE positive polarity to the right of the vertical line and NW negative to the left (Irving & Runcorn 1957; Stewart & Irving 1974; Smith et al.