The Devonian of New York. Devonian or Newyorkian? The International Subcommission on Devonian Stratigraphy visits New York State.

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Presentation transcript:

The Devonian of New York

Devonian or Newyorkian? The International Subcommission on Devonian Stratigraphy visits New York State

Devonian – the Age of Fish

Trouble in Paradise K-bentonites (volcanic ashes) in the Helderberg Group

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

Onondaga Limestone – the last of the carbonate seas

Devonian Paleogeography

Gaspe’ Peninsula, Quebec – Volcanic Ashes

Acadia National Park, Maine

Hudson Valley, NY - Folding

Angular Unconformity – Hudson Valley

Taking out the Tilt

Folded Taconic Unconformity

The Catskill Clastic Wedge The Catskill Front

Flysch in the Catskill Wedge

Catskill Molasse

Channel Sandstones and Floodplain Mudstones/Shales

Large Scale Cross Stratification

Roots in the Molasse

Offshore in the Clastic Wedge: Shale with storm-deposited sand/silt beds

Offshore in the Clastic Wedge: Shale (with concretions)

Examples of the rich Devonian fauna

Geologic Resources from the Catskill Clastic Wedge

New York State: Birthplace of the US petroleum industry

Natural gas in Western New York

A Parade of Evidence Volcanic Ashes Granitic Intrusions Regional Metamorphism – New England FoldingFaulting Catskill Clastic Wedge

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