Exceptional preservation of bryozoans from the Buckhorn Asphalt Quarry, Oklahoma, USA

Beitrag bei einer Tagung
(Abstract zum Poster)

Details zur Publikation

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


The Pennsylvanian (Desmoinesian–Virgilian) Buckhorn Asphalt Quarry in
Oklahoma, USA is well known for its exceptional preservation of a
diverse marine invertebrate fauna. Results from the latest study
focusing on the Buckhorn bryozoans are presented. Nine genera and
species are recognized, two of them new (Stenophragmidium buckhornensis
and Streblotrypa (S.) heltzelae). Some skeletal characteristics that are
usually lost during diagenesis are uniquely preserved. These include
small to large (5-50µm 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
Streblotrypa (Streblotrypa) heltzelae, Stenophragmidium buckhornensis
and Rhombocladia delicatula are tiny holes with a diameter of only 0.5
µm countersunk into the laminated skeletal walls. Such structures are
unknown from other bryozoans (recent and fossil) and their genesis –
produced by microendoliths or by the bryozoans themselves? – is unclear.
The most likely hypothesis is that they are due to symbionts (e.g.
bacteria) that lived embedded in the growing walls of the bryozoan
zooids. In fractured branches of S. (S.) heltzelae, closely spaced
‘granule’ bands 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 are reported from R. delicata and
Stenoporella sp. Spinose hemiphragms in some trepostomes are new
features of unknown function. Finally, a transverse fibrous fabric found
in the fenestrate Septopora blanda is reminiscent of a fabric common in
post-Palaeozoic cyclostome bryozoans but hitherto not reported in
palaeostomates from the Palaeozoic.

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


Seuß, B., Ernst, A., Taylor, P., & Nützel, A. (2016). Exceptional preservation of bryozoans from the Buckhorn Asphalt Quarry, Oklahoma, USA. Poster presentation at Jahrestagung der Paläontologischen Gesellschaft, Dresden.

Seuß, Barbara, et al. "Exceptional preservation of bryozoans from the Buckhorn Asphalt Quarry, Oklahoma, USA." Presented at Jahrestagung der Paläontologischen Gesellschaft, Dresden 2016.


Zuletzt aktualisiert 2019-24-04 um 06:21