<----^----  

North America over 550 Million Years
Select Era on Left Side Chart to See Geologic Change
.
(Images may initially take several seconds to load.)

42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02

For Movies click Forward or Backward. ( Large images: Forward or Backward.)

Present Day

 
---->