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154 N (appox.) Road Large White Hill ? Mt. Pi�tnitzky. Mammals in sand. CD No. 416 nr. here Mammals in green CA CF tuff. CB Bird clay Fossil Fishes Monte and leaves Verde CE, Lava Flow CC CA�AD�N HONDO ? Rough sketch of upper part of Ca�ad�n, showing relative po- sitions of the fossil localities and of the profiles. REMARKS ON CA�AD�N HONDO 155 (all the remarks that are fit to print) Ca�ad�n Hondo is remarkably confusing and no clear idea of its geology can be obtained short of a detailed survey. Its great size, very complex and obscure structure with numerous faults and folds, the discontinuity of exposures or structures at critical points, the lenticular nature of the beds, the strangeness of their facies, and the general paucity of fossils make any very definite conclusions impossible. Aside from the Patagoniano, which is always readily recognizable and usually confined to the higher rim (an exception in profile CE), the following types of sediments occur: 1. More or less massive white, pink, or rarely yellowish tuffs, with some tuffaceous clay. 2. Pale green, occasionally highly silicified and often very concretionary tuffs intercalated with bright green clay. 3. Green clay with spots and poorly sorted pebbles, associated with bright green sands and, rarely, white