Since the first of many elastic dikes was discovered near Rockwall, Texas, in 1851, their origin has been a subject of much controversy. Various observers have attributed them to the work of ancient man, igneous activity, marine sedimentation, and upward injection from parent layers of sandstone.
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Monroe, John Napier
"Origin Of The Clastic Dikes In The Rockwall Area, Texas,"
Field and Laboratory: Vol. 18
Available at: https://scholar.smu.edu/fieldandlab/vol18/iss4/1