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   Changing Paleoclimates and Mass Extinctions by Donald L. Blanchard
   ----------------------------------------------------------------------
   -- *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 Dates are from Harland, et.al. (1982) * Millions of Years Ago. |
   Return to Chapter 1 | File created on June 1, 1997. Last updated
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