Eocene calcareous nannofossils in DSDP Holes 95-612 and 95-613 ...
Lower Eocene calcareous nannofossil limestone cored at DSDP Site 612 on the middle slope off New Jersey represents an almost complete biostratigraphic sequence; only the lowest biozone (CP9a; NP10*) was not recovered. The thickness of the strata (198 m), the good preservation of the nannofossils, an...
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
1987
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| Online Access: | https://dx.doi.org/10.1594/pangaea.788520 https://doi.pangaea.de/10.1594/PANGAEA.788520 |
| Summary: | Lower Eocene calcareous nannofossil limestone cored at DSDP Site 612 on the middle slope off New Jersey represents an almost complete biostratigraphic sequence; only the lowest biozone (CP9a; NP10*) was not recovered. The thickness of the strata (198 m), the good preservation of the nannofossils, and the lack of long hiatuses justify the acceptance of this section as a lower Eocene reference for the western North Atlantic margin. The widely recognized and very similar nannofossil zonations of Martini (NP zones) and Bukry-Okada (CP zones) are emended slightly to make their lower Eocene biozones coeval; in addition, five new subzones are erected that subdivide zones CP10 and CPU (NP12 and NP13). Established biozone names are retained as they are altered little in concept, but alphanumeric code systems are changed somewhat by appending an asterisk (*) to identify zones that are emended. Zone CP10* (NP12*) is divided into two parts, the Lophodolithus nascens Subzone (CP10*a; NP12*a) and the Helicosphaera ... : Supplement to: Valentine, Page C (1987): Lower Eocene calcareous nannofossil biostratigraphy beneath the Atlantic slope and upper rise off New Jersey - new zonation based on Deep Sea Drilling Project Sites 612 and 613. In: Poag, CW; Watts, AB; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 95, 359-394 ... |
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