Exceptional preservation of Carboniferous bryozoans in the Buckhorn Asphalt Quarry of Oklahoma, USA

Conference contribution
(Abstract of lecture)


Publication Details

Author(s): Taylor P, Seuß B, Ernst A
Publication year: 2015


Abstract

The Late Carboniferous Buckhorn Asphalt Quarry exposes an ‘Impregnation
Fossil Lagerstätte’ (Seuss et al. 2009), famous for its high-quality
preservation of molluscs and other fossils. Some of the fossils conserve
pristine aragonite or high-Mg calcite, mineral phases seldom preserved
in Palaeozoic deposits. Located 10 km south of Sulphur, Oklahoma, the
Buckhorn Asphalt Quarry was worked commercially in the 1920s and 1930s
for road-paving asphalt. The Buckhorn Asphalt Quarry deposit comprises
mixed siliciclastic–carbonate, mostly shallow-water sediments belonging
to the Boggy Formation (Deese Group). The impregnating asphalt was
derived from hydrocarbons that migrated into the sediments during or
shortly after deposition, infilling pore spaces, sealing the sediment
and fossils from circulating pore waters and inhibiting diagenesis and
cementation.
Although bryozoans have been recorded previously from the Buckhorn
Asphalt Quarry, they have never been studied in any detail. The fauna is
dominated by rhabdomesine cryptostomes and trepostomes, with fewer
fenestrates. Chambers of the zooids are largely empty of sediment or
cement, which has enabled the observation of some enigmatic internal
skeletal features under SEM. For instance, transverse rows of granules
line the chambers of the rhabdomesine Streblotrypa, and the hemiphragms
of a tabuliporid trepostome have peculiar spinose outgrowths on their
proximal edges. Also puzzling is the occurrence in several species of
submicron-sized pits on internal wall surfaces. Although superficially
resembling microendoliths (Wisshak et al. 2008), the pits may be too
small for such an origin to be correct (M. Wisshak, pers. comm.), and
the laminae of the bryozoan skeletons appear to be deflected around them
suggesting formation during the growth of the host bryozoan skeletons.


FAU Authors / FAU Editors

Seuß, Barbara Dr.
Lehrstuhl für Paläoumwelt


External institutions with authors

Universität Hamburg


How to cite

APA:
Taylor, P., Seuß, B., & Ernst, A. (2015). Exceptional preservation of Carboniferous bryozoans in the Buckhorn Asphalt Quarry of Oklahoma, USA. Paper presentation at 13th Larwood Symposium, Thurso.

MLA:
Taylor, Paul, Barbara Seuß, and Andrej Ernst. "Exceptional preservation of Carboniferous bryozoans in the Buckhorn Asphalt Quarry of Oklahoma, USA." Presented at 13th Larwood Symposium, Thurso 2015.

BibTeX: 

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