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                                                                   SMITHSONIAN  CONTRIBUTIONS  TO  THE  EARTH  SCIENCES






































































                          FIGURE  18.-SEM  photographs  showing  silt  and  day  fraction  of  the  sand-silt  sediment  type:
                          A-D, sample LY-II-6, d;  E-F,  LY  II-5A, g  (c  = calcareous  biogenic grain, f  =  feldspathic  dastic
                          grain,  t  = tunicate  ascidian  spicule).  (Poorly defined  day and  silt-sized  crystals,  needles,  aggre-
                          gates,  and coccoliths sbown in E  and F;  explanation  in  text.)
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