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P. 214 CANADON LOBO Fossils are very rare. We found bones in situ at horizons on both sides of the Canadon as marked on profile, but only one identifiable specimen, horizon uncertain. The argiles fillisllaires consist of regularly bedded, harder and softer beds, the hard beds consisting of silicified tuff, here grey to yellow, sometimes with limonite nodules. The fracture is conchoidal & very irregular but in places there is a system of more or less parallel vertical joints & sometimes-another less definite & about right angles to the first. The contact of arg. fis. & The overlying tuffs is parallel & apparently concordant. Although fairly sharp, there are two beds of typical silicified tuff above the contact, & others similar but not identical, so that the two series seem to intergrade. Within the tuffs there is tusquilla, 15'+or- in thickness & ca. 40' above the arg. fis. On the N side. On the south side the main tusquilla likewise 15'+or-=(see p. 216) P. 215 CANADON LOBO Specimen 341. Broken Polydolopid tooth. Lower part of section of p. 212, but exact horizon uncertain. C.S.W. 4/14/31 1 pack 28445.