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P. 210 Nearer Comodoro, as in the Astra camp or the Y. P. F. camps 3 & 5 the nearly or quite barren upper parts of this tuff series, & no fossils have been found here so far as I know. --------------------------- Hence south to region of Mazaredo (p. 211) coast is all Patagoniano. P. 211 REGION OF MAZAREDO The interest of this region is due to a broad anticline which brings pre-Patagoniano rocks to the surface along the coast from Punta Casamayor to a point between Punta Nava and Bahia Sanquinetti, studied by Ameghino (both C. & F. in person & by many others (e.g. Feruglio) The central part, that near the embayment of Mazaredo itself, is occupied by argiles fissilaires (typical locality) beneath which at the crest of the uplift are limited exposures of dark to black clay (upper Pehuenche by Y.P.F. usage). The tuffs are not well seen here although according to Feruglio's geologic sketch (& contrary to Ameghino) they occur even on the crest. The Tertiary tuffs are well exposed in the first Canadon SE of Punta Casamayor, but more fully in the second Canadon, locally called Canadon Lobo ? the same as Ameghino's Canadon Tournouer where the following sections were taken: