An exceptionally widespread ignimbrite with implications for pyroclastic flow emplacement - Wilson, C. J. N.; Houghton, B. F.; Kampt, P. J. J.; McWilliamst, M. O. (Nature Publishing Group, 1995)
http://dx.doi.org/10.1038/378605a0
Keywords: W; V; WW-YZ; TA-TD; U