By A. D. Stewart
The Torridonian sediments shaped in a Proterozoic rift approximately contemporaneous with the Keweenawan Supergroup of North the United States. The booklet comprises the 1st whole box description of rocks and sedimentary environments during which they shaped, including a accomplished exam in their tectonic, palaeoclimatic value, palaeomagnetism and diagenesis. It contains the result of over 40 years paintings by way of the writer, so much of it formerly unpublished.
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Extra resources for Later Proterozoic Torridonian
A, CN and K are mol percentages of A12O3 (equivalent to the CIA index), CaO & Na2O, and K2O, respectively. Sample numbers follow: Rubha Guail Formation = Tl & T2, Loch na Dal = T6 & T8-T11, Beinn na Seamraig = T12-T22, Kinloch = T23-T37 & K2, lower Applecross = T38-T43, upper Applecross = T44-T50. scarcely soluble in stream water (Drever 1997, table 9-1) and have the additional advantage of being virtually immobile during diagenesis. Other relatively insoluble elements which may be used are K and Si.
35-36). These features suggest that the lake formed a sink for the Applecross alluvial system and gradually filled up with sediment supplied mainly from afar. The turbidites are interpreted as delta-front deposits. Lake levels evidently varied greatly, probably by tens of metres, for there are desiccated horizons between the turbidites, and also phases of deep erosion during which braided sheets of sand spread down the palaeovalleys of Raasay. Valley-confined rivers Sheets of gneiss cobble conglomerate up to 14 m thick appear at intervals through the whole of the Diabaig Formation from Inverpolly Forest northwards to the latitude of Canisp and Suilven, a distance of about 10 km perpendicular to the southeasterly palaeocurrent direction.
The sediments filling the palaeovalleys at the base of the group form a well-defined lithostratigraphic unit, the Diabaig Formation, characterized by breccias and sandstones derived from the immediately adjacent basement (Fig. 23). The Cailleach Head Formation at the top of the Group is also a valid lithostratigraphic unit, formed of coarsening-upward cyclothems of grey shale and red sandstone. The bulk of the Torridon Group, however, is red sandstone best regarded as a single unit, but divided by the Geological Survey into two formations: the coarse-grained, pebbly Applecross Formation below, and the fine-grained pebble-free Aultbea Formation above.