Here is a listof terms and concepts important in the Sauk sequence. Feel free to use this material as a study guide.
3 tcratonic behaviors: emergence, submergence, oscillatory
diachronous stratigraphy
cratonic sequence
actualism
Sauk Sequence overview
3 lithofacies: inner belt, carbonate shoals, mixed carbonate/detrital
PALEOGEOGRAPHY/PALEOCLIMATOLOGY
ORGANISMS
Tommotian
metazoans
Burgess Shale
life form differences
|
Precambrian |
Cambrian |
|
1. no hard parts |
1. chitin & CO3 shells in many phyla |
|
2. Ediacarian fauna |
2. complex body systems |
|
3. photosynthetic algae |
3. metazoans some with notocords |
|
4. herbivorous protozoa |
4. polyphyletic evolution |
|
oceanic realm |
cratonic realm |
carbonate banks |
|
mixed |
inner detrital belt |
carbonates |
|
deep |
shore & craton |
open sea |
4 Early Ordovician biogeographic provinces
Ediacarian 650-570 ma
Summary of Ediacarian Events
|
550 ma |
earliest trilobites |
|
600-570 ma |
base of Tommotian - Cambrian |
|
650-600 ma |
Ediacarian fauna |
|
1,000 -650 ma |
Upper PC tillites |
CAMBRIAN - ORDOVICIAN
Cambrian Cambro-Ordovician
Upper C: diverse trilobites & phosphatic brachiopods
Lower O: less diverse trilobites & brachiopods, wide variety of new taxa and phyla
2 facies: graptolitic facies, shelly facies
Ordovician series: Canadian (old), Champlainian, Cincinnatian (young)
Illinois Stratigraphy
Mt. Simon Sandstone
Knox Dolomite Megaroup
Eau Claire Formation
Galesville Sandstone
Ironton Sandstone
Derby-Doerun Formation /Franconia Formation
Potosi Dolomite
Eminence Formation
Jordan Sandstone
Prairie du Chien Gp
Gunter Sandstone
Oneota Dolomite
New Richmond Sandstone
Shakopee Dolomite