101 American Geo-Sites you've gotta seeRocks racing across a lakebed in Death Valley. Perfectly preserved 36 million year old tsetse flies in Colorado. Dinosaur trackways cemented into ancient floodplains in Connecticut. A gaping rift in the Idaho desert. What do these enigmatic geologic phenomena have in common? Besides initiating a profusion of head scratching over the years, these sites of geologic wonder appear side by side, for the first time, in a single publication.