. Bulletin. Natural history; Natuurlijke historie. 8 FUSULINIDAE OF HUECO MOUNTAINS, TEXAS Stone pebbles, in some instances forming coarse conglomerates, in the thicker limestone units; (c) marl slopes with considerable orange chert; and (d) the pres- ence of a large limestone reef. The observations of King, et al. (1945) are limited to exposures south of the New Mexico-Texas State line, more specifically the area between the El Paso-Carlsbad highway and the mouth of Hueco Canyon, whereas the range extends some distance to the north into New Mexico. This northern portion was mapped by Hardie (
. Bulletin. Natural history; Natuurlijke historie. 8 FUSULINIDAE OF HUECO MOUNTAINS, TEXAS Stone pebbles, in some instances forming coarse conglomerates, in the thicker limestone units; (c) marl slopes with considerable orange chert; and (d) the pres- ence of a large limestone reef. The observations of King, et al. (1945) are limited to exposures south of the New Mexico-Texas State line, more specifically the area between the El Paso-Carlsbad highway and the mouth of Hueco Canyon, whereas the range extends some distance to the north into New Mexico. This northern portion was mapped by Hardie (1958), who noted that the Pennsylvanian rocks there differed markedly from those described to the south. He reported that por- tion of the Pennsylvanian along the escarpment to consist of regularly cyclical de- posits of alternating shales, limestone, and limestone-and-chert-pebble conglom- erates in the lower two-thirds and a predominance of massive limestone with a few shales and conglomerates in the upper third. Since the Magdalena is situated beneath an unconformity which decreases in magnitude to the north, the Pennsyl- vanian rocks north of Hueco Canyon are probably younger than those described by King, et al. to the south (see fig. 4). North South. Figure 4. Schematic diagram of regional unconformity at base of Hueco group. Beds of the upper division of the Magdalena limestone begin to appear be- neath the unconformity at the base of the Hueco group in the vicinity of Powwow Canyon, on the east wall of the canyon below the airway beacon. At this point they are exposed at the head of the canyon, whereas farther to the north they crop out at the base of the escarpment and in outliers immediately west of the escarp- ment. Additional exposures occur peripheral to the Red Mountain intrusion in the northern Hueco Mountains a few miles east of the escarpment. By virtue of a gentle northern regional dip of the Pennsylvanian rocks and their truncation by. Please note that these i
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