The “Haymond boulder beds” have been described as sedimentary layers of Pennsylvanian age which crop out in the northeastern part of the Marathon Basin in West Texas (Fig. 1). These outcrops have been recorded at two localities; one east of Haymond (near Housetop Mountain), and the other southeast of Gaptank (Old Clark Place). Sellards (1931) described the “boulders” as erratics, which he considered as evidence of mountain-making movements south and east of the Marathon region. He described the outcrop at the Old Clark Place as a conglomerate stratum, as did Baker (1932). King, Baker, and Sellards (1931)...

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