Keigwin, Lloyd D (1978): Ages, biostratigraphic datums, and coiling ratios of Pulleniatina in sediments from DSDP Holes 15-154A and 16-157 [dataset publication series]. Graduate School of Oceanography, University of Rhode Island at Kingston, PANGAEA, https://doi.org/10.1594/PANGAEA.722569, Supplement to: Keigwin, LD (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
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Abstract:
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.
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Project(s):
Deep Sea Drilling Project (DSDP)
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
Event(s):
15-154A * Latitude: 11.084500 * Longitude: -80.380300 * Date/Time: 1971-01-29T00:00:00 * Elevation: -3338.0 m * Penetration: 172 m * Recovery: 129.8 m * Location: Caribbean Sea/RIDGE * Campaign: Leg15 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 171 m cored; 0 m drilled; 75.9 % recovery
16-157 * Latitude: -1.761700 * Longitude: -85.902800 * Date/Time: 1971-02-12T00:00:00 * Elevation: -2591.0 m * Penetration: 437 m * Recovery: 267.6 m * Location: South Pacific/RIDGE * Campaign: Leg16 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 48 cores; 418 m cored; 0 m drilled; 64 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets
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Datasets listed in this publication series
- Keigwin, LD (1978): (Table 1) Ages and biostratigraphic datums of DSDP Hole 15-154A sediments. https://doi.org/10.1594/PANGAEA.711730
- Keigwin, LD (1978): Coiling ratios of Pulleniatina spp. in sediments from DSDP Hole 15-154A. https://doi.org/10.1594/PANGAEA.722567
- Keigwin, LD (1978): (Table 1) Ages and biostratigraphic datums of DSDP Hole 16-157 sediments. https://doi.org/10.1594/PANGAEA.711731
- Keigwin, LD (1978): Coiling ratios of Pulleniatina spp. in sediments from DSDP Hole 16-157. https://doi.org/10.1594/PANGAEA.722568