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 entire box description of rocks and sedimentary environments during which they shaped, including a complete exam in their tectonic, palaeoclimatic value, palaeomagnetism and diagenesis. It contains the result of over 40 years paintings by means of the writer, so much of it formerly unpublished. additionally on hand: Lewisian Geology of Gairloch - Geological Society Memoirs M0024 - ISBN 978-1-86239-116-1 The lifetime of Frank Cole Phillips - Geological Society Memoirs M0024 - ISBN 978-1-86239-102-4 The Geological Society of LondonFounded in 1807, the Geological Society of London is the oldest geological society on the planet, and one of many biggest publishers within the Earth sciences.The Society publishes a variety of top quality peer-reviewed titles for teachers and execs operating within the geosciences, and enjoys an enviable foreign recognition for the standard of its work.The many components within which we post in include:-Petroleum geology-Tectonics, structural geology and geodynamics-Stratigraphy, sedimentology and paleontology-Volcanology, magmatic experiences and geochemistry-Remote sensing-History of geology-Regional geology publications
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Extra resources for Later Proterozoic Torridonian (Memoir)
Diver, pers. ) and have also been recovered by Naumova & Pavlovsky (1961) from macerations of correlative shales on Raasay (p. 107). 5; Rodd & Stewart 1992). The lake was shallow, for mud-cracked surfaces are common; there are about 2000 such surfaces in 115 m of shale at Diabaig. Assuming a typical sedimentation rate for lacustrine muds and silts of 500m/Ma (Hakanson & Jansson 1983, p. 162 & 173; Baltzer 1991) gives an average of one desiccation event per century. The sedimentation rate adopted, however, could be in error by a factor of 2.
It has been aptly described as 'probably the most dramatic Precambrian landscape in Europe' (Butler 2000). The last area, with relief of about 300m is between Gairloch and Loch Torridon (Fig. 25). In Raasay, some 450 m of two-dimensional relief is seen in a Stratigraphic profile 6 km long (Fig. 106). The palaeovalleys are partly filled by the breccias, sandstones and shales of the Diabaig Formation, whereas the interfluves are buried by the overlying fluviatile Applecross Formation. In general the palaeovalleys trend northwestwards, parallel to the foliation in the gneisses, but the original flow directions of the Fig.
They also approach the unconformity at low angles (cf. Williams 1968, figs 4 & 5) so that compaction would have tended to stretch most of 31 them, not the contrary. The palaeosols contain pedogenic smectite, cut by clear diagenetic illite associated with K-metasomatism of the palaeosols (Retallack & Mindszenty 1994, figs 8 & 11; Young 1999b, fig. 6). Bulk samples of the claystone have Weber indices as low as 348 and 775. Retallack & Mindszenty consequently believe the palaeosol was buried to a depth of less than 1500m and heated to no more than 120°C.