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San Diego Formation: Wikis


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The San Diego Formation is a mostly sand, with rock layer from a former bay of San Diego of Late Pliocene age.

Besides those of clams and other mollusks, quite a few bird fossils (which are generally rare) have been found in this geological formation. Among them is a possible ancestor of Cassin's Auklet (Ptychoramphus aleuticus) and the loons Gavia concinna and G. howardae. The former was quite likely a close relative or even ancestor of the large black-headed[1] loons; the latter was perhaps a small relative of the large grey-headed[2] loons[3].


  1. ^ Common Loon (G. immer) and Yellow-billed Loon (G. adamsii)
  2. ^ Pacific Loon (G. pacifica) and Arctic Loon (G. arctica)
  3. ^ Brodkorb (1953, 1963: p.224)


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