This book is the first book in a series on geology and geologists, presenting a cross section of North America along the fourtieth parallel. A trip west is an intro to plate Tectonics probably the most readable summary extant. Geologists will fingd it sound ,others will find it illuminating.
This is a wonderful book. I've read a few that cover some of the same ground (figuratively speaking), like Assembling California, and you can get some of the same insights there. A lot of explanation of the history of Geology, and the Plate Techtonic Revolution of the 1960s. He can combine the sublime and ridiculous in one sentence sometimes.