Archaeocyathan limestone (Fork Tree Limestone, Lower Cambrian; Old Sellicks Hill Road, Fleurieu Peninsula, South Australia) 2 : 無料・フリー素材/写真
Archaeocyathan limestone (Fork Tree Limestone, Lower Cambrian; Old Sellicks Hill Road, Fleurieu Peninsula, South Australia) 2 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Archaeocyathan limestone in the Cambrian of South Australia.This limestone outcrop is in South Australia's Fork Tree Limestone (Lower Cambrian). The unit has archaeocyathan fossils (= irregularly rounded/ovoid structures), which were described in 1990 (Debrenne & Gravestock. 1990. Archaeocyatha from the Sellick Hills Formation and Fork Tree Limestone on Fleurieu Peninsula, South Australia. Geological Society of South Australia Special Publication 16: 290-309.)Archaeocyathans were sessile, benthic filter-feeding invertebrates that made a double-walled, calcareous skeleton. They are now considered to be an odd group of sponges. They formed bioherms (reefs) and are significant guide fossils in Lower Cambrian rocks.Classification: Animalia, Porifera, ArchaeocyathaStratigraphy: near the base of the Fork Tree Limestone, Normanville Group, lower Botomian Stage, middle Lower CambrianLocality: hillside exposure along Old Sellicks Hill Road, south-southeast of the town of Sellicks Hill, northern Fleurieu Peninsula, southeastern South Australia (vicinity of 35° 20.071' South latitude, 138° 28.703' East longitude) |
| 撮影日 | 2006-08-14 21:42:15 |
| 撮影者 | James St. John |
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