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158 but in general 2 lies above 3. In at least one place (profile CF, west, left, end) 3 seems clearly to overly 4. Nevertheless as in CA and in the confused region between the Bird Clay + Monte Verde generally 3 contains lenses of ss. similar to 4 and it is probably that it grades laterally into sediments of the type of 4, at least partially. From conditions such as are shown in profiles CA + CB it seems probable, again not proven, that 2 underlies and also at least partially grades laterally into type 1. A tentative hypothesis as to these relations, subject to study of the mammals etc. and far from established as fact, is shown on the next page: