The Torridonian sediments of the northwest seaboard of Scotland provide some of the most dramatic scenery of Europe, and some of its most dramatic controversies. From the earliest days of highland geological exploration the Torridonian was a source of controversies, some now resolved, others still debated. The mystery of the exotic pebbles, according to palaeocurrent data derived from the Atlantic Ocean, is now resolved, thanks to comprehension of continental drift. The Torridonian has been attributed to every environment of deposition known on Earth, and even to derivation from the Moon (Parkes, 1963). The climatic conditions under which Torridonian...

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