Aretz et al_2011.pdf - ORBi - Université de Liège

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Kölner Forum Geol. Paläont., 19 (2011)
M. ARETZ, S. DELCULÉE, J. DENAYER & E. POTY (Eds.)
Abstracts, 11th Symposium on Fossil Cnidaria and Sponges, Liège, August 19-29, 2011
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d’Estaing, and the ‘younger’ White Point Conglomerate to Boxing Bay Formation succession to the east.
Indeed, they have tentatively correlated the Stokes Bay Sandstone and Smith Bay Shale collectively with the
White Point Conglomerate to Boxing Bay Formation succession.
Deeper water mudstone dominates the overlying Emu Bay Shale. Trilobites including Redlichia takooensis
and Estaingia bilobata date the diverse fauna of this formation to the Botoman-equivalent Pararaia janeae
Zone (JELL in BENGTSON et al. 1990). The Boxing Bay Formation surmounts the succession and comprises
feldspathic and micaceous sandstone with minor conglomerate beds, the latter incorporating abundant
gneiss and rare limestone clasts. Conglomerate beds with carbonate clasts identical to those in underlying
formations reportedly recur in the upper part of the Boxing Bay Formation (BELPERIO in GRAVESTOCK &
GATEHOUSE 1995: 17).
Within the Stansbury Basin, the finer details of correlation between the exposed successions on
Kangaroo Island and adjacent Yorke and Fleurieu Peninsulas, and subsurface in intervening Gulf St
Vincent, are a matter of ongoing debate. A particularly intractable issue is correlation of the essentially
unfossiliferous Kanmantoo Group (HAINES & FLÖTTMAN 1998). Archaeocyaths in transported clasts of the
White Point Conglomerate offer a potential biostratigraphic constraint on timing of deposition of that
formation, and thereby contribute to testing the competing correlation hypotheses outlined above. In the
present study, five transported clasts were sampled from the bedded cobble to boulder conglomerate facies
association (DAILY et al. 1980) in the upper White Point Conglomerate at Cape d’Estaing. Initial indications
suggest the presence of a Botoman-equivalent archeocyathan fauna.
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Geology and Geophysics, 17: 183-200.
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Australia. - Memoirs of the Association of Australasian Palaeontologists, 9: 1-364.
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1957 Bureau of Mineral Resources, Geology and Geophysics, Bulletin, 49: 91-147].
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Australia. – In: DAILY, B. (Ed.), Geological excursions handbook. ANZAAS, 41st Congress, Section 3: 49-54.
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Australia. - In DAILY, B (Ed.), Geological excursions handbook. ANZAAS, 41st Congress, Section 3: 23-30.
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GEHLING, J.G., JAGO, J.B., PATERSON, J.R., GARCÍA-BELLIDO, D.C. & EDGECOMBE, G.D. (2011): The geological context of the
Lower Cambrian (Series 2) Emu Bay Shale Lagerstätte and adjacent stratigraphic units, Kangaroo Island, South
Australia. - Australian Journal of Earth Sciences, 58: 243-257.
GRAVESTOCK, D.I. & GATEHOUSE, C.G. (1995): Stansbury Basin. – In: DREXEL, J.F. & PREISS, W.V. (Eds.), The geology of
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GRAVESTOCK, D.I., ALEXANDER, E.M., DEMIDENKO, YU.E., ESAKOVA, N.V., HOLMER, L.E., JAGO, J.B., LIN TIANRUI,
MEL’NIKOVA, L.M., PARKHAEV, P.YU., ROZANOV, A.YU., USHATINSKAYA, G.T., ZANG WENLONG, ZHEGALLO, E.A. &
ZHURAVLEV, A.YU. (2001): The Cambrian biostratigraphy of the Stansbury Basin, South Australia. - Transactions
Palaeontological Institute RAS, 282: 1-344.
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