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Changing Paleoclimates and Mass Extinctions
by Donald L. Blanchard
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| Geological Time Chart |
| Time Intervals |
Predicted Climate |
| Era |
Period |
Epoch |
Duration |
Ma* |
Ma* |
Duration |
Hadley
Cells |
Climate |
C
E
N
O
Z
O
I
C
|
Neogene |
Pleistocene | 2 | 2 |
12 |
27 |
6 |
DRY |
Pliocene
| 3 | 5 |
Miocene
| 20 | 25 |
| 38 |
26 |
10 |
| Paleogene |
Oligocene | 13 | 38 |
| Eocene | 17 | 55 |
65 |
27 |
6 |
| Paleocene | 10 | 65 |
M
E
S
O
Z
O
I
C
|
Cretaceous |
Late | 32.5 | 97.5 |
176.5 |
111.5 |
2 |
WET |
| Early | 46.5 | 144 |
| Jurassic |
Late | 19 | 163 |
| Middle | 25 | 188 |
| 203.5 |
27 |
6 |
DRY |
| Early | 25 | 213 |
| 229.5 |
26 |
10 |
| Triassic |
Late | 18 | 231 |
| Middle | 12 | 243 | 256.5 |
27 |
6 |
| Early | 5 | 248 |
P
A
L
E
O
Z
O
I
C
|
Permian |
Ochoan | 8 | 256 |
| Guadalupian | 2 | 258 |
368 |
111.5 |
2 |
WET |
| Leonardian | 10 | 268 |
| Wolfcampian | 18 | 286 |
| Pennsylvamian |
Gzelian | 34 | ? |
| Kasimovian | ? |
| Moskovian | ? |
| Bashkirian | 320 |
| Mississippian |
Serpukhovian | 13 | 333 |
| Visean | 19 | 352 |
| Tournaisian | 8 | 360 |
| Devonian |
Famennian | 7 | 367 |
| Frasnian | 7 | 374 |
395 |
27 |
6 |
DRY |
| Givetian | 6 | 380 |
| Eifelian | 7 | 387 |
| Emsian | 7 | 394 |
| Siegenian | 7 | 401 |
421 |
26 |
10 |
| Gedinnian | 7 | 408 |
| Silurian |
Pridoli | 6 | 414 |
| Ludlow | 7 | 421 |
| Wenlock | 7 | 428 |
448 |
27 |
6 |
| Llandovery | 10 | 438 |
| Ordovician |
Ashgill | 10 | 448 |
| Caradoc | 10 | 458 |
559.5 |
111.5 |
2 |
WET |
| Llandeilo | 10 | 468 |
| Llanvirn | 10 | 478 |
| Arenig | 10 | 488 |
| Tremadoc | 17 | 505 |
| Cambrian |
Merioneth | 18 | 523 |
| St. David's | 17 | 540 |
| Caerfai | 50 | 590 |
586.5 |
27 |
6 |
DRY |
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* Millions of Years Ago. |
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File created on June 1, 1997.
Last updated November 2004.
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 Site designed and hosted by: WebSpinners.com (info@webspinners.com)
WebMaster: Donald L. Blanchard |