Cznou City area, Sand Crack section. 0.8 to Siltstone, platy, argill., dk gray 1.2 weathers in slabs, bszl 0.2+ is bl. highly silty sh 6.3 Porcellenitu 1.1) Interbedded argill., siltstu & silty bl. sh., Siltstu hard dzk gray loc sandy. 0.18 bed zt bzs0. 1.7 Shzlc, blzchk, silty fissile becoming siltier downward becoming hard dk blue weath siltst in bzsyl 0.3 5.0 Sandstone fine-gr- to silty+ thick bedded, dk gray zt b2se becoming white above, in beds 2.0 + 1.0, weathers mottled OB + brown 2.1 Siltstu, argill., shely hard to massive, gray-black, weathers blue+ blue gray. 13