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|Title: ||Guadalupian Symposium|
|Authors: ||Wardlaw, Bruce R.|
Grant, Richard E.
Rohr, David M.
|Issue Date: ||21-Aug-2000|
|Citation: ||Smithsonian Contributions to the Earth Sciences; 32|
|Abstract: ||The internal stratigraphy of the Cutoff Formation in the Guadalupe
Mountains is clarified, and the unit is divided into three members: the Shumard
Canyon, the El Centro, and the Williams Ranch members. The Shumard Canyon Member
of the Cutoff Formation in the Guadalupe Mountains correlates to the upper part
of the Cathedral Mountain Formation in the Glass Mountains. The El Centro and
Williams Ranch members of the Cutoff Formation and the lower part of the Brushy
Canyon Formation, including the Pipeline Shale in the Guadalupe Mountains, correlate
to the Road Canyon Formation. The changeover in conodonts from transitional
forms to <em>Mesogondolella nankingensis</em>) provides a basal definition for
the Guadalupian and occurs within correlation unit 3 in the El Centro Member
of the Cutoff Formation and cycle 2 of the Road Canyon Formation.
The geology, stratigraphy, and depositional setting of the Permian
in the Del Norte Mountains and of the Word Formation in the Glass Mountains
are discussed in detail, and this data suggest deposition in a foreland basin
or backbay between the Marathon Fold Belt and the Delaware basin. The internal
stratigraphy of the Road Canyon, Word, Vidrio, Altuda, Capitan, and Tessey formations
reveal the following: (1) the Road Canyon was deposited in four cycles and the
Word in six cycles; (2) the Altuda can be divided into five informal members
and the Tessey into three members; (3) the Vidrio is an unconformity-bounded
unit; and (4) the Capitan displays characteristic platform margin to slope foresets.
Biozonation of the Guadalupian is discussed, and details are provided
on the fusulinid and conodont zonations. Changes in conodont fauna, based on
the succession of <em>Mesogondolella</em> species from <em>M. nankingensis</em>
to <em>M. altudaensis</em>, divide the Guadalupian into five zones.
Five new species of conodonts (<em>Sweetina crofti</em> Wardlaw,
<em>Mesogondolella shannoni</em> Wardlaw, <em>Hindeodus wordensis</em> Wardlaw,
<em>Iranognathus punctatus</em> Wardlaw, and <em>Sweetognathus bicarinum</em> Wardlaw)
and two new species of fusulinids (<em>Codonofusiella</em> (<em>Lantschichites</em>)
<em>altudaensis</em> Wilde and Rudine and <em>Rauserella bengeensis</em> Wilde and
Rudine) are described.|
|Appears in Collections:||Smithsonian Contributions to the Earth Sciences|
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