plete at all three holes. Nevertheless, a detailed biostrati-graphic study was undertaken in order to glean whatever useful information might be obtained about the mid-Cretaceous history of the North Atlantic. Checklists of cal-careous nannofossils for the three holes are given in Figures 1 to 3 wit...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.548.4789 http://www.deepseadrilling.org/51_52_53/volume/dsdp51_52_53pt2_15.pdf |
| Summary: | plete at all three holes. Nevertheless, a detailed biostrati-graphic study was undertaken in order to glean whatever useful information might be obtained about the mid-Cretaceous history of the North Atlantic. Checklists of cal-careous nannofossils for the three holes are given in Figures 1 to 3 with certain species illustrated on Plate 1. On the basis of the first appearance in the stratigraphic record of Lithastrinus floralis, a distinctive nannofossil species, the oldest sediment above basement in each hole is the same age. According to Thierstein (1973), this species first ap-pears near mid-Aptian and is common to abundant in upper Aptian and younger sediments. No similar predecessor species is known. In all three of the above holes Lithastrinus floralis appears a short distance above the sediment-basement contact. Following the time scale of van Hinte |
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