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~- Immediately northwest of town is a volcanic plug known as Cedar <br />Mountain; this mountain is believed to be of tertiary origin. Generally, <br />this region is one marked by disturbances of both regional and local vol- <br />canic forces. In turn, these series of forces created localized anticlines <br />and synclines. <br />Breeze Mountain, located southeast of Craig, is another tertiary in- <br />trusion. This intrusion has lifted surrounding sedimentary rocks, including <br />rocks of the Aiesaverde Group into a dome known as Breeze Anticline or <br />CraigaDome. <br />Farther to the southwest lie the Williams Fork Mountains. The gray <br />shales and sandstones of the Eocene Wasatch Formation were derived from <br />these mountains. At Craig, the Wasatch Formation outcrops are more than <br />1000 feet thick. In contrast to these gray outcrops, the Piesaverde sand- <br />stone is ta^ in color and tends to develop deep fist-sized cavities as <br />it weathers. Sometimes these sandstone outcrops are large enough that <br />prolonged weathering forms large caves or shelters such as those in the <br />south flanks of the Williams Fork Mountains. The Mesaverde Group contains <br />numerous coal layers, some of them quite thick, formed in cretaceous swamps <br />and lagoons similar to those that border the Atlantic and the Gulf Coast <br />states today (Chronic 1980: 272). <br />• <br />VIEW OF CEDAR MOUNTAIN AT LEFT ON THE HORIZON <br />WITH CRAIG, COLORADO ON RIGHT JUST BELOW HORIZON <br />\I <br />7 <br />