| OCR Text |
Show 19 1. Dark grey, apparently 2. wes. to various shades thering of orange and red, in relation to the iron contente Poorly to very well "sandy siltstone" as sorted, IIlay generally be considered. the average non-bedded siltstone falls a michmy between the indicated extremes. 3. Appears to be composed primarily of quartz ,.with percent of fine mica and small percent of other minerals. few Loca tions, there is high percentage a. of one to two frosted, rounded, quartz grains present that appear siltstone rna trix. one or two percent In a _!lete,. to float in non=bedded siltstone is difficult to dif Typical ferentiate from tilloid matri..x and in tains large a ,9, very faw Locatdons it con , of clasts gre.9. tar t.han t·wo millimeters in diameter. 4. Contains a crudely no deve l.oped , bedding or sedimentary structures, hut horizontal, shaly fissility ill 5. Corrtact.s with the overlying sharp, except tilloid.s" in the case where the and overlying over a distance of 6. 101ost non-bedded siltstone units aze and units loca.tions. are underlying Contacts between til1oid· and non-bedded s11 tstone commonly gre.d.ational and underlying some does have broadly lenticular in a '(Ani t.s are a.re few inches. a.re five to ten :feet thick shape. 7. Non-bedded siltstone is .not durable, and weathers to cave commonly a con slope littered with small platy fragments derived from the out crop •. 8. Some non-bedded 511tstone intervals contain len·cicular de posits of dark to llght grey litha.renite to sublitharenite that average |
