California offers a lifetime's worth of geologic sights and localities; the Sierra Nevada and San Andreas fault are the barest beginning. Elsewhere this simplicity is broken: in the north, the blue-and-red Klamath Mountains are torn from the Sierra and moved westward while the dotted pink is where young, widespread lavas of the Cascade Range bury all older rocks.
The Tuscaloosa Group gives way to the compressed, folded rocks of the southernmost Appalachian Mountains to the northeast and the flat-lying limestones of the interior basins to the north.
These different geologic elements give rise to a great variety of landscapes and plant communities, in what outsiders might consider a flat and uninteresting region.
Arizona will provide rocks and problems for many generations of geologists to come.
Arkansas encompasses a great variety of geology within its borders, even a public diamond mine.