by letter code
example: Gd
|
-
|
145Gd
|
< 1 day
|
V
|
146Gd
|
1–10 days
|
I
|
149Gd
|
10–100 days
|
B
|
153Gd
|
100 days–10 a
|
G
|
148Gd
|
10–10,000 a
|
Y
|
150Gd
|
10 ka–103 Ma
|
O
|
152Gd
|
> 700 Ma
|
R
|
158Gd
|
Stable
|
Used in:
|
|
by number code
0
|
|
1–10 years
|
1
|
|
10–100 years
|
2
|
|
100–1k years
|
3
|
|
1k–10k years
|
4
|
|
10k–100k years
|
5
|
|
100k–1M years
|
6
|
|
1M–10M years
|
7
|
|
10M–103M years
|
8
|
|
103M–700M years
|
9
|
|
700M–14G years
|
Used in:
|
|