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<br />28GS <br /> <br />Triassic and Jurassic Systems <br /> <br />. <br /> <br />Glen canyon Group <br /> <br />The Glen Canyon Group was named after Glen canyon of <br /> <br />the Colorado Rivr,r in Kane County, southeastern Utah, <br /> <br />where the formations comprising the group are typically <br /> <br />e:{posed. The term was first applied by Gilluly, Reeside, <br /> <br />Gregory, and Moore to rocks having a similar lithologic <br /> <br />character and areal extent. The first published reference <br /> <br />to the name was by aaker, Dobbin, McKnight, and Reeside <br /> <br />(1927) :md included the Wingate Sandstone (Dutton, 1885), <br /> <br />tile Todilto Formation (Gregory, 1917), and the Navajo <br /> <br />Sandstone (Gregory, 1917). The type ~odilto Forraation was <br /> <br />de tenlined to be youngr,r than the Todil to of the Glen <br />. Canyon area, and the term "Kayenta Formation" (Baker, Dane, <br /> <br />,1'll1 McKnight, 1931) was introduced to replace what was <br /> <br />first considered to be a sandstone facies of the 'fodilto <br /> <br />Formation. The Glen Canyon Group is considered to be <br /> <br />both Triassic and Jurassic (Hu.l."shbi:lrger, Repenning, and <br /> <br />Irwin, 1957, and Lewis, Irwin, and Wilson, 1961). <br /> <br />l <br />I <br /> <br />. <br /> <br />~I? <br />.oJ" <br />