At many localities along the outcrop of the Austin formation in Dallas County, Texas, channel fillings apparently composed of reworked bedrock occur at levels above the highest stream terraces. If a post-Cretaceous chronology for this portion of Texas is to be formulated, these channel fillings must be taken into account. A more immediate problem, however, is that of the origin of the fillings themselves.
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Ham, William Otis Jr.
"Origin Of Some Channel Fillings In The Austin Formation Around Dallas, Texas,"
Field and Laboratory: Vol. 9
Available at: https://scholar.smu.edu/fieldandlab/vol9/iss1/3