Paleozoic (continued)

Tippecanoe Sequence

• Mid. Ordovician-Lower Devonian
  
• Transgression
  
  - quartzarenite (Saint Peter SS)
  - limestone
  
• Regression
  
  - East
  - sandstone and shale
  - Great Lakes Region
  - reefs (limestone)
  - evaporites
  

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Late Silurian Evaporite Basins

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Silled basin model for evaporite deposition
(Figure 11.12, p.309)

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• Ohio Subsurface
  

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Paleozoic Geography

• Laurentia
  
• Baltica
  
• Gondwana
  
• Iapetus Ocean
  
• Laurasia
  

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Late Cambrian Paleogeography
Figure 11.2a, p.298

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Appalachian Mobile Belt

• Passive Margin
  
  - Late Proterozoic (Precambrian)-Early Ordovician
  - Continental Shelf Deposits
  - Sandstone & Limestones
  

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figure 11.13a, p.310

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Paleogeography, 514 myrs (Late Cambrian)

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• Taconic Orogeny
  
  - Middle to Late Ordovician
  - Principle area effected-NE North America
  - Subduction Zone (closing of Iapetus Ocean)
  

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eastward subduction zone and development of volcanic arc

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497 myrs

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- Collision of Volcanic Arc With Laurentia

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458 myrs

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• Evidence for Taconic Orogeny
  
  - Deep-water deposits
  
  - graptolitic black shales
  
  - litharenites
  - Taconic Highlands
  - Volcanic Activity
  
  - K-bentonites
  
  - Igneous Intrusions and Regional Metamorphism
  
  - radiometric ages 440-480 myrs
  
  - Clastic Wedge
  
  - Queenston Delta
  

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Stratigraphic cross section of Ordovician K-bentonites

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Thickness map of Ord. K-bentonites

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Isopach map of Upper Ordovician clastic sediments
of the Queenston Delta

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Cross-section of Upper Ordovician clastic sediments
of the Queenston Delta

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last updated 1-11-98

All original material copyright (c) 1998 by Annabelle Foos. All rights reserved.