The result was my 1981 book, “The Nine Nations of North America.” The reader reaction was astonishing. This map – drawn to anticipate the news – revealed something much deeper. It turned ...

A geologist has mapped the formation of North America across hundreds of millions ... Ron Blakey, of Flagstaff, Arizona, has been sketching maps for decades. His first pen-and-ink maps date ...

In the long term, the map could inspire and inform modeling efforts aimed at better understanding North America's geologic past, as well as the continent's present day tectonic intricacies.