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• <br />Purgatoire Formation -- Glencairn Shale Member <br />at top contains olive-brown thin-bedded sand- <br />stone, gray and black shale and clay; about <br />BO feet (24m) thick. Underlain by Lytle Sand- <br />stone Member, which contains white fine to <br />~~oarse-grained sandstone, variegated clay, and <br />pebble beds; about 110 feet (33m) thick <br />Jmr - ]9orrison and Ralston Creek Formation (Upper <br />Jurassic) <br />Iorrison Formation -- Varicolored gray, maroon, <br />+~nd green siltstone and claystone and thin beds <br />of sandstone, limestone and conglomerate. Thick- <br />~iess about 300 feet (90m) <br />]~alston Creek Formation -- Greenish-gray clay- <br />:~tone, gray arkosic limestone, and arkosic <br />:>andstone and conglomerate containing pebbels <br />tsnd cobbles eroded from underlying or nearby <br />I~recambrian rocks. Thickness about 60 feet <br />(18m) <br />PPf fountain Formation (Permian and Pennsylvanian) <br />P4oderate reddish-brown askosic conglomerate, <br />yellowish-gray coarse-grained cross-stratfied <br />arkosic sandstone, and thin layers of pale- <br />c;reen and dark reddish-brown micaceous shale. <br />A few clasts in conglomerate in lower part of <br />formation are of lower Paleozoic rocks; abun- <br />dance of Precambrian clasts increases upward. <br />thickness 1,200 feet (365m) iGerhard, 1967) <br />• <br />• <br /> <br />The gypsum deposit occurs in the Morrison Formation <br />(Upper Jurassic) and is approximately 150 feet thick in the pro- <br />posed mine area. 7'he formation dips approximatly 10° to the <br />southwest as noted in the map toward the Canyon City-Florence <br />Basin. <br />