. Occasional papers of the California Academy of Sciences . rphism, and predominantly basic. The sedimentaries or alteredsedimentaries included with the lavas are probably not older thanCretaceous. Some of them may be early or middle Eocene. SEDIMENTARY ROCKS At many places, mostly in Darien from the Sabana River west-ward; on certain islands in the Gulf of Panama; at Bahia Honda onthe south coast of Veraguas; and on the Burica Peninsula, there isfound a stratified white, gray, blue, or green chert, which lies on thevolcanics of the basement complex where its base is seen, and under-lies the E

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. Occasional papers of the California Academy of Sciences . rphism, and predominantly basic. The sedimentaries or alteredsedimentaries included with the lavas are probably not older thanCretaceous. Some of them may be early or middle Eocene. SEDIMENTARY ROCKS At many places, mostly in Darien from the Sabana River west-ward; on certain islands in the Gulf of Panama; at Bahia Honda onthe south coast of Veraguas; and on the Burica Peninsula, there isfound a stratified white, gray, blue, or green chert, which lies on thevolcanics of the basement complex where its base is seen, and under-lies the Eocene limestone. In the Rio Sabana-Rio Congo area ofDarien, it is in some places interbedded with tuffs, but in general itappears to be a separate unit. No fossils have been seen in it, andits age is unknown. Olsson (1942) thinks it may be the equivalent -. f^l, > mmMiwmmMmm M,. ^ \ > V >:- 5 5^> i: V -,, >\ -ii:, \ ^>>\ i i i , w V ^ \ V % v% ^ \ is . Wm^ KiiiiyAi>yI ]\ W\ -^ wv

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectscience, bookyear1890