7 61 1CC 0 0 72.00 75.10 HEAT S 23 1 S RT SILTSTONE 2 S % WELL INDURATED FRAGMENTS,PARENT SEDIMENT WAS 3 S % BASICALLY PYROCLASTIC-A SILTY ASH WITH 4 S % INCORPORATED RADIOLARIANS AND PROBABLY SOME 5 S % PELAGIC CLAY* 6 G FELDSPAR LATHS 7 G PYX 8 G MAGN 9 G % MAGN AND PYX PALE BROWN AND ONLY IN SOME 10 G % FRAGMENTS,COARSER GRAINS AND FRAGMENTS TEND TO BE 11 G % CONCENTRATED IN LAMINAE LESS THAN .1MM THICK* 12 A CHALC SCATTERED 13 A % .04-.07 AND RARELY TO .150MM UNFILLED AND INVERTED 14 A % RADIOLARIA(MOSAICS OF .005-.02MM PATCHES OF 15 A % CHALCEDONY FIBERS); 16 A CHLORITE FRAGMENTS 17 A PALAG 18 A % ORANGE-BROWN OF SIMILAR SIZE TO FELDSPAR IN A 19 A % FINE SILICEOUS AND POSSIBLY ZEOLITIC CLAYEY 20 A % (MONTMORILLONITE?) MATRIX; 21 A ZEOLITES MATRIX 22 A % POSSIBLY MONTMORILLONITE* 23 7 61 2 21070 0 94.00 96.57 HEAT I 28 1 S RT DOLERITE-BASALT; 2 S TEX INTERSERTAL* 3 G LABRADOR 1LATHS 4 G % APPROX COMP AN65 BY MICHEL-LEVY METHOD,USUALLY 5 G % TWINNED,RARELY ZONED-UNIFORM CHANGE TO SODIC RIMS, 6 G % MOST SHOW PARTIAL REPLACEMENT BY PALE GREEN 7 G % MONTMORILLONITE?(SWELLS WHEN WET) ALONG EDGES, 8 G % CLEAVAGES AND FRACTURES; 9 G PYX .9EUHEDRAL-SUBHEDRAL PRISMS 10 G % PALE GRAYISH TO REDDISH BROWN,NON-PLEOCHROIC, 11 G % 2V 60,PERHAPS AN IRON-POOR AUGITE; 12 G MAGN 0.2EUHEDRAL GRAINS 13 G % ALSO PRESENT AS TINY WEDGES AND DUST IN THE NOW 14 G % ALTERED GROUNDMASS(.O1MM XTLS), 15 G % GROUNDMASS PROBABLY ORIGINALLY GLASSY IS LARGELY 16 G % FLAKES AND PINNATE MASSES OF GREEN AND BROWN 17 G % CHLORITE AND POSSIBLY MONTMORILLONITE WITH SOME 18 G % MICROLITES AND RARE BROWN HORNBLENDE BLADES; 19 G HBL .2 BLADES 20 A CARB VEINS 21 A ZEOLITE VEINS 22 A CHLORITE GROUNDMASS 23 A % GREEN AND LESSER BROWN; 24 A MONT GROUNDMASS, 25 A VESICLES 26 V MONTMORILLONITE 27 V % ACICULAR MONTMORILLONITE LINES VESICLES* 28