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

Conference contribution
(Abstract of a poster)


Publication Details

Author(s): Seuß B, Taylor P, Ernst A, Nützel A
Publication year: 2016
Language: English


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 Authors / FAU Editors

Seuß, Barbara Dr.
Lehrstuhl für Paläoumwelt


External institutions with authors

Ludwig-Maximilians-Universität (LMU)
Universität Hamburg


How to cite

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.

BibTeX: 

Last updated on 2019-24-04 at 06:21