AlaskaGeography.com
Alaska Geologic History Maps
These are a series of five maps created to show the theorized locations of the various terranes that make up Alaska over time. They have been put together using a variety of geologic sources so while the overall picture may be correct, the details are still subject to debate.
| Late Paleozoic Alaska | 300 million years ago | (78 KB) |
| Jurassic Alaska | 190 million years ago | (106 KB) |
| Early Cretaceous Alaska | 140 million years ago | (103 KB) |
| Late Cretaceous Alaska | 90 million years ago | (103 KB) |
| Eocene Alaska | 55 million years ago | (115 KB) |
The terranes are symbolized on the maps with the following abbreviations:
| AX |
Alexander
Terrane |
SM |
|
| CA |
ST |
Stikine
Terrane |
|
| CC |
Cache
Creek Terrane |
TG |
Togiak
Terrane |
| CG |
Chugach
Terrane |
W/LG |
|
| DL |
WR |
Wrangellia
Terrane |
|
| KY |
Koyukuk
Terrane |
YA |
Yakutat
Terrane |
| MN |
YT |
Yukon-Tanana
Terrane |
|
| MY |
Mystic
Terrane |
DARK
GRAY |
Local
Volcanics |
| NF |
Nixon
Fork Terrane |
LIGHT
GRAY |
Kahiltna
Terrane |
| PE |
Peninsular
Terrane |
MEDIUM
GRAY |
North
American Craton |
| PW |
Prince
William Terrane |
PINK |
Arctic
Composite Terrane |
| QN |
Quesnellia
Terrane |
TAN |
Local
Sedimentary Rocks |
| RB |
Ruby
Terrane |
|
|
Copyright © 2000 by David K. Snyder. Permission is granted to use these materials for academic or personal use. Any other use will be granted only by written permission of the author.