Abstract
Fragments ranging in size up to a maximum of 135 feet in greater dimension, imbedded in an arkosic or greywacke matrix, and derived from a rock succession about 10,000 feet in thickness, are found in several horizons of the Middle Pennsylvanian Haymond formation in the Marathon Basin, Trans-Pecos, Texas. Truly exotic boulders of metamorphic and plutonic rocks and of a mid-Pennsylvanian marine limestone occur with fragments of rocks indigenous to the area. Important folding had occurred by the time the boulder-arkoses were formed; subsequently the Haymond strata were greatly deformed by folding and thrusting. It is thought to be demonstrated that the boulders and their matrix are not thrust mylonites attributable to any of the visible faulting, but that they are really sediments. Possible modes of origin are considered to be either that they were derived as a consequence of possible diastrophic events not now definitely ascertainable or that they are ice-transported.
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