Trace fossils from the Cambro-Ordovician cow head group,newfoundland, and their paleobathymetric implication |
| |
Authors: | Lubomir F Jansa |
| |
Institution: | Eastern Petroleum Geology Subdivision, Atlantic Geoscience Centre, Bedford Institute of Oceanography, Dartmouth, N.S. Canada |
| |
Abstract: | U-shaped burrows identified as the trace fossil Arenicolites occur in the Cambro-Ordovician Cow Head Group, a series of thin-bedded limestones interbedded with graptolitic shale and thick beds of limestone breccia and conglomerate. The lithology, limestone petrography, and trace fossils indicate deposition on a submarine slope of a slowly submerging carbonate platform. The limestone bed containing Arenicolites probably represents a period of slow deposition. The steeply inclined U-shaped burrows are assumed to have been formed by polychaete worms of the family Mochtyellidae which thrived in an argillaceous carbonate mud bottom of a carbonate platform slope, in depths exceeding 200 m. Although Arenicolites is believed to denote a shallow-water environment, its presence in the Cow Head extends the ecological niche of the Arenicolites-producing organisms into the outer shelf and continental slope. The domichnia of suspension feeders thus extends from shallow- to deep-water environments. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|