Eocene calcareous nannofossils in DSDP Holes 95-612 and 95-613, 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
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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PANGAEA - Data Publisher for Earth & Environmental Science
1987
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ftdatacite:10.1594/pangaea.788520 2023-05-15T17:37:10+02:00 Eocene calcareous nannofossils in DSDP Holes 95-612 and 95-613, 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 Valentine, Page C 1987 application/zip https://dx.doi.org/10.1594/pangaea.788520 https://doi.pangaea.de/10.1594/PANGAEA.788520 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.2973/dsdp.proc.95.111.1987 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Deep Sea Drilling Project DSDP Collection article Supplementary Collection of Datasets 1987 ftdatacite https://doi.org/10.1594/pangaea.788520 https://doi.org/10.2973/dsdp.proc.95.111.1987 2021-11-05T12:55:41Z 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 seminulum Subzone (CP10*b; NP12*b). Zone CPU* (NP13*) is divided into three parts, the Helicosphaera lophota Subzone (CP11*a; NP13*a), the Cyclicargolithuspseudogammation Subzone (CP11*b; NP13*b), and the Rhabdosphaera tenuis Subzone (CP11*c; NP13*c). At Site 612, a time-depth curve based on nannofossil datums dated in previous studies reveals a smoothly declining sediment accumulation rate, from 4.9 cm/10**3yr in CP10* (NP12*) to 2.8 cm/103 yr. in CP12* (NP14*). The ages of first-occurrence datums not previously dated are approximated by projection onto this timedepth curve and are as follows: Helicosphaera seminulum, 55.0 Ma; Helicosphaera lophota, 54.5 Ma; Cyclicargolithus pseudogammation, 53.7 Ma; Rhabdosphaera tenuis, 52.6 Ma; and Rhabdosphaera inflata, 50.2 Ma. At nearby Site 613 on the upper rise, strata of similar age, 139 m thick, contain an unconformity representing Subzone CPll*b (NP13*b) and a hiatus of approximately 1.1 m.y. duration. The sediment accumulation rate in the lower part of this section (9.7 cm/10**3yr.) is twice that observed for equivalent strata at Site 612. The hiatus and the heightened sediment accumulation rate at Site 613 probably represent the effects of episodic mass wasting on the early Eocene continental slope and rise. Article in Journal/Newspaper North Atlantic DataCite Metadata Store (German National Library of Science and Technology) Valentine ENVELOPE(-54.550,-54.550,-61.083,-61.083) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Deep Sea Drilling Project DSDP |
spellingShingle |
Deep Sea Drilling Project DSDP Valentine, Page C Eocene calcareous nannofossils in DSDP Holes 95-612 and 95-613, 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 |
topic_facet |
Deep Sea Drilling Project DSDP |
description |
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 seminulum Subzone (CP10*b; NP12*b). Zone CPU* (NP13*) is divided into three parts, the Helicosphaera lophota Subzone (CP11*a; NP13*a), the Cyclicargolithuspseudogammation Subzone (CP11*b; NP13*b), and the Rhabdosphaera tenuis Subzone (CP11*c; NP13*c). At Site 612, a time-depth curve based on nannofossil datums dated in previous studies reveals a smoothly declining sediment accumulation rate, from 4.9 cm/10**3yr in CP10* (NP12*) to 2.8 cm/103 yr. in CP12* (NP14*). The ages of first-occurrence datums not previously dated are approximated by projection onto this timedepth curve and are as follows: Helicosphaera seminulum, 55.0 Ma; Helicosphaera lophota, 54.5 Ma; Cyclicargolithus pseudogammation, 53.7 Ma; Rhabdosphaera tenuis, 52.6 Ma; and Rhabdosphaera inflata, 50.2 Ma. At nearby Site 613 on the upper rise, strata of similar age, 139 m thick, contain an unconformity representing Subzone CPll*b (NP13*b) and a hiatus of approximately 1.1 m.y. duration. The sediment accumulation rate in the lower part of this section (9.7 cm/10**3yr.) is twice that observed for equivalent strata at Site 612. The hiatus and the heightened sediment accumulation rate at Site 613 probably represent the effects of episodic mass wasting on the early Eocene continental slope and rise. |
format |
Article in Journal/Newspaper |
author |
Valentine, Page C |
author_facet |
Valentine, Page C |
author_sort |
Valentine, Page C |
title |
Eocene calcareous nannofossils in DSDP Holes 95-612 and 95-613, 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 |
title_short |
Eocene calcareous nannofossils in DSDP Holes 95-612 and 95-613, 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 |
title_full |
Eocene calcareous nannofossils in DSDP Holes 95-612 and 95-613, 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 |
title_fullStr |
Eocene calcareous nannofossils in DSDP Holes 95-612 and 95-613, 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 |
title_full_unstemmed |
Eocene calcareous nannofossils in DSDP Holes 95-612 and 95-613, 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 |
title_sort |
eocene calcareous nannofossils in dsdp holes 95-612 and 95-613, 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 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1987 |
url |
https://dx.doi.org/10.1594/pangaea.788520 https://doi.pangaea.de/10.1594/PANGAEA.788520 |
long_lat |
ENVELOPE(-54.550,-54.550,-61.083,-61.083) |
geographic |
Valentine |
geographic_facet |
Valentine |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://dx.doi.org/10.2973/dsdp.proc.95.111.1987 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.788520 https://doi.org/10.2973/dsdp.proc.95.111.1987 |
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1766136946743050240 |