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PRELIMINARY SEQUENCE AND EVENT STRATIGRAPHIC CORRELATIONS WITHIN THE HELDERBERG GROUP (SILURIAN-DEVONIAN) BETWEEN NEW YORK AND THE CENTRAL APPALACHIAN BASIN. James R. Ebert Damon K. Matteson SUNY College at Oneonta. New York: Appalachian Standard Succession.

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James r ebert damon k matteson suny college at oneonta

PRELIMINARY SEQUENCE AND EVENT STRATIGRAPHIC CORRELATIONS WITHIN THE HELDERBERG GROUP (SILURIAN-DEVONIAN) BETWEENNEW YORK AND THE CENTRAL APPALACHIAN BASIN

James R. Ebert

Damon K. Matteson

SUNY College at Oneonta


New york appalachian standard succession
New York: Appalachian Standard Succession WITHIN THE HELDERBERG GROUP (SILURIAN-DEVONIAN) BETWEEN

  • Late nineteenth and early twentieth century studies

  • Johnson and Murphy (1969)

  • Helderberg Group

  • Silurian-Devonian

    • Přídolí-Lochkovian

    • Predominantly limestone

    • Some shaly units


Primacy of new york in the early literature
Primacy of New York WITHIN THE HELDERBERG GROUP (SILURIAN-DEVONIAN) BETWEENin the Early Literature

  • Early Twentieth Century Stratigraphy and Correlations to New York based on:

    • General lithologic similarities

    • Faunal similarities

  • Names from New York applied from New Jersey to Virginia – the Central Appalachian Basin (CAB)


A new view of helderberg stratigraphy
A New View of Helderberg Stratigraphy WITHIN THE HELDERBERG GROUP (SILURIAN-DEVONIAN) BETWEEN

  • Rickard (1962) - migrating coeval facies

  • Laporte (1969) – spectrum of ramp environments


Rickard s stratigraphy and the role of the appalachian standard succession
Rickard’s Stratigraphy and the Role of the Appalachian Standard Succession

  • Rickard’s (1962) migrating coeval facies influences correlations

    • in the CAB

    • between NY and the CAB

  • Head (1969, 1972, 1974)

  • Dorobek (1984), Dorobek and Read (1986)


Revised helderberg stratigraphy new york ebert and matteson 2003a b
Revised Helderberg Stratigraphy – New York Standard SuccessionEbert and Matteson (2003a,b)


Rationale for revised stratigraphy
Rationale for Revised Stratigraphy Standard Succession

  • Contacts are unconformable

  • Clarifies placement of the S/D boundary based on conodonts


New questions in a classic setting
New Questions in a Classic Setting Standard Succession

  • How does the presence of unconformities in NY affect correlations within the CAB and between NY and the CAB?

  • Are these unconformities widespread? Can they be recognized in the CAB and used as a framework for correlation?

  • What are the relative roles of eustatic and tectonic processes in producing the unconformities?

  • Can basin-wide revision of Helderberg stratigraphy provide new insights on global sea level change around the S/D boundary?


Framework for stratigraphic correlations
Framework for Stratigraphic Correlations Standard Succession

  • Working model of early correlations

  • Examination of contacts

    • Evidence of erosion

    • Evidence of sediment starvation

  • Biostratigraphic data – FAD Icriodus woschmidti

  • Unique faunal occurrences - Scyphocrinites

  • Recognition of events and marker beds

    • Distinctive facies/lithologies - two

    • Episodes of siliciclastic influx

    • Trangressive maxima - two

    • Bald Hill K-bentonites


Sequence 1 manlius lower keyser
Sequence 1: Manlius/Lower Keyser Standard Succession


Sequence 2 green vedder big mountain shale
Sequence 2: Standard SuccessionGreen Vedder/Big Mountain Shale




Sequence 4 coeymans new creek
Sequence 4: Coeymans/New Creek Standard Succession

First Icriodus woschmidti - Silurian/Devonian Boundary

HCU is erosional throughout the basin


Sequence 5: Standard Succession

Kalkberg/Corriganville


An Undiscovered Unconformity in NY? Standard Succession

?


Bald hill k bentonites
Bald Hill K-bentonites Standard Succession

Basin-wide markers

(Smith, Berkheiser and Way 1986)

Age of S/D Boundary - 418 Ma

(Tucker, et. al. 1998)


Second transgressive maximum
Second Transgressive Maximum Standard Succession


Conclusions
Conclusions Standard Succession

  • NY unconformities can be traced into CAB

  • Most unconformities in NY are erosional

  • Most in the CAB are marked by sediment starvation

  • Minelot Falls/Tonoloway-Keyser Unconformity and Howe Cave Unconformity are erosional throughout basin

  • A Přídolí transgressive maximum is now recognized

  • Sequence and event stratigraphic correlations between NY and the CAB are similar to those proposed in the early twentieth century

  • Correlations are preliminary; much more work needs to be done!


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