101 American Geo-Sites you've gotta see geology the Guide is a timely

the Guide is a timely

National Geographic has been meeting their need for clear and accurate information for 25 years with our million-selling Field Guide to the Birds of North America

and a table listing birds seen

and George H

5 million years ago as postulated in a new paper based on original research on possible local effects of the Eltanin asteroid impact

101 American Geo-Sites you've gotta see geology the Guide is a timelyRocks 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.