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The Cloridorme and St. Roch Formations are well exposed along the Gaspé Peninsula. They provide important historical as well as architectural information for the study of deep-water sediments and architectures. The Cloridorme was one of the earliest studied deep-water deposits in North America (1). A recent study of these deposits includes that of 3. The Cloridorme has many different architectural elements, but it is best known for the extremely laterally continuous, layered sheet, and thin-bed sandstones. However, the St. Roch Formation, although not having nearly the extensive outcrops of the Cloridorme and being less studied, does contain excellent architectural elements of thin beds and a channel. Although of different ages and basins, the three outcrops on the northern Gaspé Peninsula (St. Roch, Tourelle [chapter 20, this volume], and Cloridorme) provide a fine composite set of proximal, medial, and more distal deep-water deposits, respectively.

The St. Roch Formation, Lower to Middle Cambrian age, was deposited in an elongate, unconfined basin. Deposits were derived from the north off the craton; this was before the onset of tectonic influences from the Taconic orogeny to the south. Numerous thin-bed outcrops are present in the area but the subject outcrop area occurs at L’Islet Wharf, near St. Jean Port Joli. At this location, the thin-bed sequence increases in net-to-gross (N/G) and average bed thickness from base to top, indicative of progradation and/or a more proximal source of sediment. Progradation terminates with the emplacement of a highly erosive

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