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Extra resources for Geognostisch-palaeontologische Bemerkungen über die Halbinsel Mangischlak und die Aleutischen Inseln. St. Patersburg: Kaiserlischen Akademie der Wissenschaften

Sample text

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.

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