"Around 15,000 years ago, as the last ice age was melting down, you didn't want to be standing in Idaho's Clark Fork River Valley. Giant glacial Lake Missoula stretched 174 miles behind an ice dam ready to burst.

When the 2,000-foot-high ice dam did go, the lake surged downstream with a flow ten times greater than the flow from all the world's present rivers combined....Geologists call this a superflood. Several occurred at the end of the last ice age.....But much controversy still remains over the magnitude of these floods, their timing and the extent to which they differ from floods that scientists can observe and measure today."

The debate is about uniformitarianism versus what is obvious from the evidence. It fails to mention poleshifts which would also cause superfloods throughout the world. Story is at UniSci and Newswise