The Devonian of New York

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The Devonian of New York
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Devonian or Newyorkian?The International
Subcommission on Devonian Stratigraphy visits New
York State
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Devonian the Age of Fish
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Trouble in Paradise

• K-bentonites (volcanic ashes) in the Helderberg
  Group

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Here we go! No, forget it.

• Helderberg Group cut by major unconformity
• Overlain by Oriskany Sandstone
• Quartz arenite
• Oriskany is overlain by Tristates Group
• Shale, siltstone, thin volcanic ashes
• Tristates is succeeded by Onondaga Limestone
• Return to Paradise - Reefs

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Onondaga Limestone the last of the carbonate
seas
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Devonian Paleogeography
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Gaspe Peninsula, Quebec Volcanic Ashes
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Acadia National Park, Maine
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Hudson Valley, NY - Folding
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Angular Unconformity Hudson Valley
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Taking out the Tilt
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Folded Taconic Unconformity
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The Catskill Clastic Wedge
The Catskill Front
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Flysch in the Catskill Wedge
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Catskill Molasse
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Catskill Molasse
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Catskill Molasse
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Channel Sandstones and Floodplain Mudstones/Shales
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Large Scale Cross Stratification
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Roots in the Molasse
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Offshore in the Clastic WedgeShale with
storm-deposited sand/silt beds
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Offshore in the Clastic WedgeShale (with
concretions)
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Examples of the rich Devonian fauna
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Geologic Resources from the Catskill Clastic Wedge
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New York StateBirthplace of the US petroleum
industry
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Natural gas in Western New York
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A Parade of Evidence

• Volcanic Ashes
• Granitic Intrusions
• Regional Metamorphism New England
• Folding
• Faulting
• Catskill Clastic Wedge

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Acadian Orogeny

• Collision between Laurentia (North America) and
• Avalon parts of northern Europe and U.K.
• Peri-Gondwanan terranes
• Closure of the northern part of Iapetus