Permian/Triassic

[TomForest@aol.com]

Dec. '94 "Discover" magazine, p. 16:

"Geochemist Kun Wang of the University of Ottawa, 'The extinction was very
abrupt.  It could have been a few months, a few years. or a few thousand
years, but it wasn't millions of years.'  Wang's evidence comes from...rocks
at Williston Lake in British Columbia.  [I]n the upper few inches of the
deposit...the researchers found a sudden drop in the ratio of carbon 13 to
carbon 12.  This suggests, says Wang, that there was suddenly plenty of
carbon 12 to go around - presumably because some catastrophe had wiped out
most phytoplankton...[and] roughly 95 percent of all species."

Can anyone point me to more info on this research?