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FIGURE  20.-SEM  photographs  showing  silt  and  day  fraction  of  the  volcanic  ash  type  (A),
                          organic ooze  (B-D),  and sapropel  (E  and F):  A,  sample LY 11-3,  h;  B-D,  LY 11-3,  e;  E-F,  LY  II-3,
                          i  (/ = feldspathic grain, p = pyrite framboid).  (Volcanic glass  shards in A;  explanation  in  text.)
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