Wei, Wuchang (1995): Nannofossil datums and occurrence of microspherules in Upper Eocene sediments of the lower latitudes (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.702680, Supplement to: Wei, W (1995): How many impact-generated microspherule layers in the Upper Eocene? Palaeogeography, Palaeoclimatology, Palaeoecology, 114(1), 101-110, https://doi.org/10.1016/0031-0182(95)00075-W
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Abstract:
Upper Eocene microspherules (microtektites and microkrystites) have been found in deep-sea sediments from the western North Atlantic, Caribbean, Gulf of Mexico, equatorial Pacific, and eastern equatorial Indian Ocean. Recent studies proposed that there are three or four microspherule layers: the North American microtektite and microkrystite couplet in chron C15, and one (or two) significantly older layer(s) in chron C16 in DSDP Sites 216, 292 and 612. Based on calcareous nannofossil biochronologic and morphometric data, I suggest that the microspherules in the latter sites correlate with the North American microtektite-microkrystite couplet. My results as well as previously published data are all compatible with the model of one couplet of microtektites-microkrystites. The inference of three or four microspherule layers in the upper Eocene is shown to be an artifact of interpretation.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 15.822333 * Median Longitude: -173.029800 * South-bound Latitude: 1.462200 * West-bound Longitude: 90.208000 * North-bound Latitude: 38.820200 * East-bound Longitude: -72.773800
Date/Time Start: 1970-03-22T00:00:00 * Date/Time End: 1983-08-26T00:00:00
Minimum DEPTH, sediment/rock: 136.90 m * Maximum DEPTH, sediment/rock: 574.50 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
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
22-216 * Latitude: 1.462200 * Longitude: 90.208000 * Date/Time: 1972-02-18T00:00:00 * Elevation: -2237.0 m * Penetration: 477.5 m * Recovery: 169.2 m * Location: Indian Ocean//RIDGE * Campaign: Leg22 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 353 m cored; 0 m drilled; 47.9 % recovery
Comment:
Microspherule depths in Sites 17-167, 22-216, 31-292, and 61-462 are modified from Glass et al. (1985) to comform with DSDP depth format; microspherule depth in Site 95-612 is from Glass (1989). The last occurrence of Discoaster saipanensis is 34.0 +/- 0.2 Ma and that of Chiasmolithus grandis is 37.0 +/- 0.2 Ma in the geomagnetic polarity time scale of Cande and Kent (1992). The last occurrence of Reticulofensestra reticulata (34.8 +/- 0.2 Ma) is at 157 m in Site 95-612.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Depth, top/min | Depth top | m | Wei, Wuchang | ||
| 4 | Depth, bottom/max | Depth bot | m | Wei, Wuchang | ||
| 5 | Sample code/label | Sample label | Wei, Wuchang | DSDP/ODP/IODP sample designation | ||
| 6 | Sample code/label 2 | Sample label 2 | Wei, Wuchang | DSDP/ODP/IODP sample designation | ||
| 7 | Ageprofile Datum Description | Ageprof dat des | Wei, Wuchang | LO = last occurrence | ||
| 8 | Comment | Comment | Wei, Wuchang |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
60 data points