Keller, Gerta; DHondt, Steven; Vallier, Tracy L (1983): (Table 1) Biostratigraphic zonation and core depth of microtektite occurrences in marine sediment sequences [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.772149, Supplement to: Keller, G et al. (1983): Multiple microtektite horizons in upper Eocene marine sediments: no evidence for mass extinctions. Science, 221(4606), 150-152, https://doi.org/10.1126/science.221.4606.150
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Abstract:
Microtektites have been recovered from three horizons in eight middle Eocene to middle Oligocene marine sediment sequences. Five of these occurrences are coeval and of latest Eocene age (37.5 to 38.0 million years ago); three are coeval and of early late Eocene age (38.5 to 39.5 million years ago); and three are of middle Oligocene age (31 to 32 million years ago). In addition, rare probable microtektites have been found in sediments with ages of about 36.0 to 36.5 million years. The microtektite horizon at 37.5 to 38.0 million years can be correlated with the North American tektite-strewn field, which has a fission track age (minimum) of 34 to 35 million years and a paleomagnetic age of 37.5 to 38.0 million years. There is no evidence for mass faunal extinctions at any of the microtektite horizons. Many of the distinct faunal changes that occurred in the middle Eocene to middle Oligocene can be related to the formation of the Antarctic ice sheet and the associated cooling phenomena and intensification of bottom currents that led to large-scale dissolution of calcium carbonate and erosion, which created areally extensive hiatuses in the deep-sea sediment records. The occurrence of microtektite horizons of several ages and the lack of evidence for faunal extinctions suggest that the effects of extraterrestrial bolide impacts may be unimportant in the biologic realm during middle Eocene to middle Oligocene time.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 10.204017 * Median Longitude: -159.834533 * South-bound Latitude: -15.844200 * West-bound Longitude: 41.820500 * North-bound Latitude: 24.527300 * East-bound Longitude: -69.364200
Date/Time Start: 1965-01-10T00:00:00 * Date/Time End: 1973-06-26T00:00:00
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 2.49 m
Event(s):
10-94 * Latitude: 24.527300 * Longitude: -88.469300 * Date/Time: 1970-03-22T00:00:00 * Elevation: -1793.0 m * Penetration: 660 m * Recovery: 175.2 m * Location: Gulf of Mexico/SCARP * Campaign: Leg10 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 39 cores; 294.7 m cored; 1 m drilled; 59.5 % recovery
15-149 * Latitude: 15.104200 * Longitude: -69.364200 * Date/Time: 1971-01-05T00:00:00 * Elevation: -3972.0 m * Penetration: 390 m * Recovery: 239.4 m * Location: Caribbean Sea/BASIN * Campaign: Leg15 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 390 m cored; 0 m drilled; 61.4 % recovery
17-167 * Latitude: 7.068300 * Longitude: -176.825000 * Date/Time: 1971-04-23T00:00:00 * Elevation: -3176.0 m * Penetration: 1185 m * Recovery: 288.8 m * Location: North Pacific/CONT RISE * Campaign: Leg17 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 78 cores; 699 m cored; 83 m drilled; 41.3 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Keller, Gerta | DSDP/ODP/IODP sample designation | ||
| 3 | Sample code/label 2 | Sample label 2 | Keller, Gerta | DSDP/ODP/IODP sample designation | ||
| 4 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 5 | Depth, top/min | Depth top | m | Keller, Gerta | ||
| 6 | Depth, bottom/max | Depth bot | m | Keller, Gerta | ||
| 7 | Planktic foraminifera zone | Plank foram zone | Keller, Gerta | |||
| 8 | Nannofossil zone | Nannos zone | Keller, Gerta |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
38 data points