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<br />. <br /> <br />. <br /> <br />. <br /> <br />2897 <br /> <br />T11e Burro canyon is predominately green mudstone <br />interbedded with lenses of conglomerate and conglomeratic <br />sandstone. Where mudstone of the Burro Canyon overlies <br />mulstoneof the Brushy Basin, the contact seems to be <br />conformable, and there is no indication of a break in <br />sedimentation. In places in the Four Corners area, basal <br />sandstone lenses of Burro canyon intertongue with the <br />Brushy Basin mudstone. <br />Near Four Corners, the Burro canyon Formation cannot <br />be recognized as a mappable unit, and the Dakota Sandstone <br />rests on the Brushy Basin. Here, the Brushy Basin may <br />contain some rocks of Cretaceous age. T11e absence of the <br /> <br /> <br />Burro Canyon probably is due to erosion before Dakota <br /> <br /> <br />deposition. Ekren and Houser (1959a, p. 200), however, <br /> <br /> <br />note that, ~n addition to pre-Dakota erosion, this absence <br /> <br /> <br />may be due to a facies change southward from the Ute <br /> <br /> <br />Mountains. <br /> <br />t7 <br />