 |
 |
 |
 |
 |
|
15,000 years BP
|
13,000 years BP
|
11,000 years BP
|
9,000 years BP
|
7,000 years BP
|
 |
 |
 |
 |
|
|
6,000 years BP
|
5,000 years BP
|
3,000 years BP
|
The present
|
