Nannofossil datums and occurrence of microspherules in Upper Eocene sediments of the lower latitudes (Table 1)

• Main Author: Wei, Wuchang
• Format: Dataset
• Language: English
• Published: PANGAEA 1995
• Subjects: 10-94; 17-167; 22-216; 31-292; 61-462; 95-612; Ageprofile Datum Description; Comment; Deep Sea Drilling Project; Depth; bottom/max; sediment/rock; top/min; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Gulf of Mexico/SCARP; Indian Ocean//RIDGE; Leg10; Leg17; Leg22; Leg31; Leg61; Leg95; North Atlantic/SLOPE; North Pacific/CONT RISE; North Pacific/Philippine Sea/CONT RISE; Sample code/label; Sample code/label 2; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.702680; https://doi.org/10.1594/PANGAEA.702680

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.