Pennsylvanian Bryozoans of Exceptional Preservation from the Buckhorn Asphalt Quarry, Oklahoma

Beitrag bei einer Tagung
(Abstract zum Poster)


Details zur Publikation

Autorinnen und Autoren: Seuß B, Taylor P, Ernst A, Nützel A
Jahr der Veröffentlichung: 2016
Sprache: Englisch


Abstract

The Pennsylvanian (Desmoinesian–Virgilian) Buckhorn Asphalt Quarry
(Boggy Formation, Deese Group) in Oklahoma, USA is well known for its
exceptional preservation of a diverse marine invertebrate fauna. This
includes preservation of original shell material, microscopic characters
on shells, or color patterns. Preservation is exceptionally because of
early impregnation with hydrocarbons that soaked sediments and fossils.
Results from the latest study and the first focusing exclusively on the
Buckhorn bryozoans are presented. Nine genera and species are
recognized, two of them are new (Stenophragmidium buckhornensis and
Streblotrypa (S.) heltzelae) and two genera (Shishoviclema, Shulgapora)
are identified in North American strata for the first time. Some
skeletal characteristics that are usually lost during diagenesis are
uniquely preserved or seen for the first time in Paleozoic bryozoans.
These include small to large (5-50 µm in diameter) node-like surface
expressions of styles that most likely strengthened the skeleton or were
for attachment of the soft tissue rather than defense.
‘Nanoperforations’ observed in S. (S.) heltzelae, S. buckhornensis and
Rhombocladia delicatula are tiny holes with a diameter of only 0.5 µm
countersunk (bevelled) into the laminated skeletal walls. Such
structures are unknown from other bryozoans (recent and fossil) and
their genesis – produced by small-sized symbionts (bacteria?), by
microendoliths or by the bryozoans themselves? – is unclear. The most
likely hypothesis is that they are due to symbionts that lived embedded
in the growing walls of the bryozoan zooids. In fractured branches of S.
(S.) heltzelae, closely spaced ‘granule’ bands (diameter of granules
approximately 6 µm) on the walls of the autozooids were found. Again,
such structures have not been observed elsewhere and their origin and
function are enigmatic. Mural spines (of varied size and morphology
depending on the genus) are reported from R. delicata and Stenoporella
sp. Spinose hemiphragms, with spines of 3-30 µm in length, are new
features of unknown function found in some trepostomes. Finally, a
transverse fibrous fabric found in the fenestrate Septopora blanda is
reminiscent of a fabric common in post-Paleozoic cyclostome bryozoans
but hitherto not reported in palaeostomates from the Paleozoic.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Seuß, Barbara Dr.
Lehrstuhl für Paläoumwelt


Einrichtungen weiterer Autorinnen und Autoren

Ludwig-Maximilians-Universität (LMU)
Universität Hamburg


Zitierweisen

APA:
Seuß, B., Taylor, P., Ernst, A., & Nützel, A. (2016). Pennsylvanian Bryozoans of Exceptional Preservation from the Buckhorn Asphalt Quarry, Oklahoma. Poster presentation at GSA Annual Meeting, Denver, US.

MLA:
Seuß, Barbara, et al. "Pennsylvanian Bryozoans of Exceptional Preservation from the Buckhorn Asphalt Quarry, Oklahoma." Presented at GSA Annual Meeting, Denver 2016.

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Zuletzt aktualisiert 2019-24-04 um 06:21