Volcanic activity or phenomena.
- Carboniferous volcanism, occurring at converging plates margins, both at the Appalachian and at the Ouachita margins, was decidedly not tholeiitic.
- This appears to contradict evidence from other areas, particularly Wales where subduction-related volcanism occurs in the late Tremadoc.
- The scattered nature of the outcrop and the possibility of diachronous volcanism mean that all rocks grouped as Dokhan Volcanic Series may not be coeval.
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