Ages, biostratigraphic datums, and coiling ratios of Pulleniatina in sediments from DSDP Holes 15-154A and 16-157
Pliocene and Pleistocene planktonic foraminiferal biogeography and paleoceanography have been examined in Deep Sea Drilling Project (DSDP) sites of the Panama Basin (Pacific Ocean) and Colombian and Venezuelan Basins (Atlantic Ocean) to determine the timing of the isolation of Atlantic and Pacific t...
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1978
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.722569 2023-05-15T17:15:00+02:00 Ages, biostratigraphic datums, and coiling ratios of Pulleniatina in sediments from DSDP Holes 15-154A and 16-157 Keigwin, Lloyd D MEDIAN LATITUDE: 4.661400 * MEDIAN LONGITUDE: -83.141550 * SOUTH-BOUND LATITUDE: -1.761700 * WEST-BOUND LONGITUDE: -85.902800 * NORTH-BOUND LATITUDE: 11.084500 * EAST-BOUND LONGITUDE: -80.380300 * DATE/TIME START: 1971-01-29T00:00:00 * DATE/TIME END: 1971-02-12T00:00:00 1978-06-25 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.722569 https://doi.org/10.1594/PANGAEA.722569 en eng PANGAEA GSA data repository - DSDP Holes 15-154A and 16-157 (URI: ftp://rock.geosociety.org/pub/reposit/1978/7812.pdf) https://doi.pangaea.de/10.1594/PANGAEA.722569 https://doi.org/10.1594/PANGAEA.722569 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Graduate School of Oceanography, University of Rhode Island at Kingston Supplement to: Keigwin, Lloyd D (1978): Pliocene closing of the Isthmus of Panama, based on biostratigraphic evidence from nearby Pacific Ocean and Caribbean Sea cores. Geology, 6(10), 630-634, https://doi.org/10.1130/0091-7613(1978)6%3C630:PCOTIO%3E2.0.CO;2 15-154A 16-157 Caribbean Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg15 Leg16 South Pacific/RIDGE Dataset 1978 ftpangaea https://doi.org/10.1594/PANGAEA.722569 https://doi.org/10.1130/0091-7613(1978)6%3C630:PCOTIO%3E2.0.CO;2 2023-01-20T07:31:27Z Pliocene and Pleistocene planktonic foraminiferal biogeography and paleoceanography have been examined in Deep Sea Drilling Project (DSDP) sites of the Panama Basin (Pacific Ocean) and Colombian and Venezuelan Basins (Atlantic Ocean) to determine the timing of the isolation of Atlantic and Pacific tropical planktonic faunas resulting from the development of the Central American isthmus. Previous studies have suggested a late Miocene to middle Pliocene occurrence of this event. The Panama Basin (DSDP site 157) and the Colombian Basin (DSDP site 154A) share two early Pliocene biogeographic events: (1) great abundance of sinistral coiling Neogloboquadrina pachyderma at 4.3 m.y. ago at site 157 and 0.7 m.y. later at site 154A, and (2) a sinistral-to-dextral change in the coiling-direction preference in Pulleniatina 3.5 m.y. ago at both locations. Identification of these events farther to the east in the Venezuelan Basin (DSDP site 148) is complicated by insufficient lower Pliocene core recovery, but abundant sinistral N. pachydcrma appear to have extended far to the east in the Caribbean 3.6 m.y. ago; perhaps the early Pliocene abundance of this form is not indicative of cool water. The coiling-direction history and stratigraphic ranges of Pulleniatina became different in the Atlantic and Pacific Oceans during the early Pliocene; this is inferred to result from geographic isolation of the assemblages. Saito (1976) used the temporary disappearance of this genus from Atlantic waters at 3.5 m.y. ago to mark the closure of the Isthmus of Panama, but I show that in the Colombian Basin (site 154A) its disappearance was closer to 3.1 m.y. ago. This suggests the possibility of surface-water communication between the Atlantic and Pacific until that time. Dataset Neogloboquadrina pachyderma PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(-85.902800,-80.380300,11.084500,-1.761700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
15-154A 16-157 Caribbean Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg15 Leg16 South Pacific/RIDGE |
spellingShingle |
15-154A 16-157 Caribbean Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg15 Leg16 South Pacific/RIDGE Keigwin, Lloyd D Ages, biostratigraphic datums, and coiling ratios of Pulleniatina in sediments from DSDP Holes 15-154A and 16-157 |
topic_facet |
15-154A 16-157 Caribbean Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg15 Leg16 South Pacific/RIDGE |
description |
Pliocene and Pleistocene planktonic foraminiferal biogeography and paleoceanography have been examined in Deep Sea Drilling Project (DSDP) sites of the Panama Basin (Pacific Ocean) and Colombian and Venezuelan Basins (Atlantic Ocean) to determine the timing of the isolation of Atlantic and Pacific tropical planktonic faunas resulting from the development of the Central American isthmus. Previous studies have suggested a late Miocene to middle Pliocene occurrence of this event. The Panama Basin (DSDP site 157) and the Colombian Basin (DSDP site 154A) share two early Pliocene biogeographic events: (1) great abundance of sinistral coiling Neogloboquadrina pachyderma at 4.3 m.y. ago at site 157 and 0.7 m.y. later at site 154A, and (2) a sinistral-to-dextral change in the coiling-direction preference in Pulleniatina 3.5 m.y. ago at both locations. Identification of these events farther to the east in the Venezuelan Basin (DSDP site 148) is complicated by insufficient lower Pliocene core recovery, but abundant sinistral N. pachydcrma appear to have extended far to the east in the Caribbean 3.6 m.y. ago; perhaps the early Pliocene abundance of this form is not indicative of cool water. The coiling-direction history and stratigraphic ranges of Pulleniatina became different in the Atlantic and Pacific Oceans during the early Pliocene; this is inferred to result from geographic isolation of the assemblages. Saito (1976) used the temporary disappearance of this genus from Atlantic waters at 3.5 m.y. ago to mark the closure of the Isthmus of Panama, but I show that in the Colombian Basin (site 154A) its disappearance was closer to 3.1 m.y. ago. This suggests the possibility of surface-water communication between the Atlantic and Pacific until that time. |
format |
Dataset |
author |
Keigwin, Lloyd D |
author_facet |
Keigwin, Lloyd D |
author_sort |
Keigwin, Lloyd D |
title |
Ages, biostratigraphic datums, and coiling ratios of Pulleniatina in sediments from DSDP Holes 15-154A and 16-157 |
title_short |
Ages, biostratigraphic datums, and coiling ratios of Pulleniatina in sediments from DSDP Holes 15-154A and 16-157 |
title_full |
Ages, biostratigraphic datums, and coiling ratios of Pulleniatina in sediments from DSDP Holes 15-154A and 16-157 |
title_fullStr |
Ages, biostratigraphic datums, and coiling ratios of Pulleniatina in sediments from DSDP Holes 15-154A and 16-157 |
title_full_unstemmed |
Ages, biostratigraphic datums, and coiling ratios of Pulleniatina in sediments from DSDP Holes 15-154A and 16-157 |
title_sort |
ages, biostratigraphic datums, and coiling ratios of pulleniatina in sediments from dsdp holes 15-154a and 16-157 |
publisher |
PANGAEA |
publishDate |
1978 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.722569 https://doi.org/10.1594/PANGAEA.722569 |
op_coverage |
MEDIAN LATITUDE: 4.661400 * MEDIAN LONGITUDE: -83.141550 * SOUTH-BOUND LATITUDE: -1.761700 * WEST-BOUND LONGITUDE: -85.902800 * NORTH-BOUND LATITUDE: 11.084500 * EAST-BOUND LONGITUDE: -80.380300 * DATE/TIME START: 1971-01-29T00:00:00 * DATE/TIME END: 1971-02-12T00:00:00 |
long_lat |
ENVELOPE(-85.902800,-80.380300,11.084500,-1.761700) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Neogloboquadrina pachyderma |
genre_facet |
Neogloboquadrina pachyderma |
op_source |
Graduate School of Oceanography, University of Rhode Island at Kingston Supplement to: Keigwin, Lloyd D (1978): Pliocene closing of the Isthmus of Panama, based on biostratigraphic evidence from nearby Pacific Ocean and Caribbean Sea cores. Geology, 6(10), 630-634, https://doi.org/10.1130/0091-7613(1978)6%3C630:PCOTIO%3E2.0.CO;2 |
op_relation |
GSA data repository - DSDP Holes 15-154A and 16-157 (URI: ftp://rock.geosociety.org/pub/reposit/1978/7812.pdf) https://doi.pangaea.de/10.1594/PANGAEA.722569 https://doi.org/10.1594/PANGAEA.722569 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.722569 https://doi.org/10.1130/0091-7613(1978)6%3C630:PCOTIO%3E2.0.CO;2 |
_version_ |
1766073146225459200 |