. Bulletins of American paleontology. SILTSTONE Massive black-dark green, with scottered circular concretions, evenly scattered shell hash and mollusks, mostly bivolves Horizon near base of densely packed she I I bed SILTSTONE & SANDSTONE INTERBEDS Nossive, bioturbated, si Ity shelly hash Few whole mollusks, common fine, basaltic closts The siltstone is interbedded with coarse sandstone with logs and wood flakes, scattered concretions Pervasive bioturbotion with occasional burrows Some turritellids C SANDSTONE Coorse, volconic, with elongate, root-like concretions Rich mollusks Grodes basa
. Bulletins of American paleontology. SILTSTONE Massive black-dark green, with scottered circular concretions, evenly scattered shell hash and mollusks, mostly bivolves Horizon near base of densely packed she I I bed SILTSTONE & SANDSTONE INTERBEDS Nossive, bioturbated, si Ity shelly hash Few whole mollusks, common fine, basaltic closts The siltstone is interbedded with coarse sandstone with logs and wood flakes, scattered concretions Pervasive bioturbotion with occasional burrows Some turritellids C SANDSTONE Coorse, volconic, with elongate, root-like concretions Rich mollusks Grodes basally into siltstone Rich in mollusks in SILTY CLAYSTONE Massive, green-grey, with shell hash, scattered small knobby concretions abundant lithic grains oP basalt, 12-^ mm] Occosionol bentonitic horizons CLAYEY SILTSTONE Blue-grey, rich in fine, comminuted shell hash, with scattered lithic fragments and knobby concretions Rich in mollusks at top SILTSTONE Blue-grey, fine shelly, with occasional large, irregular burrows, shell hash dense and abundant but Finely comminuted OccasionoT whole bivalves, no lithic clasts Some large strombids (Melongena) NO EXPOSURE 9*1 5m Change of Scale 16 D - ^7^ 1 -- J- CLAYEY SILTSTONE With scattered fine hash 62,1203, 201,175L â 2225 r 1202, N 1201 N 1200 N7 -C":^-:w-:'"- 5-^:f->':-V-^-i~^sS K CLfiYEY SILTSTONE Grey-blue, with diFFuse, Finely scattered shell hash, rich in diverse mollusks Ivermet1ds, serpulidsl, rore corals Very biaturboted -.^ 1--0-^-N^"v- \J> NO EXPOSURE 1 Sm - 1199 N 1198 N 1197 N 1196 200-2221 1195 R 1191 B A 4 1 I 1 - -: SILTY CLAYSTONE Grey-black, Fine, rich m scattered mollusks Massive pervasive bioturbotion _ SILTY CLAYSTONE Uith abundont she 11s, concretions ot base '-: - - VX-"^-*--o-- -â¢.--.â¢.>'â¢. NO EXPOSURE Thickness oF unexposed interval is 11 3iii r 30 - 20 - Change oF Scale - 10. -1- -f â --â¢s- - ^-- â â *?- SILTT CLATSIONE Very slightly, mossive, unbedded, grey-b
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