Waitt,who is with the US Geological Survey in Vancouver,Washington,has visited the Scablands hundreds of times to trace the story of the megafloods through the record preserved in sediment.

• Richardhitt在华盛顿州范库弗的美国地质测量局工作，他已经数百次造访疤地，通过沉积物中保存下来的纪录追踪大洪水的故事。