| Abstract: | Leg 94 of the Deep Sea Drilling Project has provided a unique set of paleomagnetically dated cores, taken along a N-S transect in the North Atlantic. High deposition rates in the sediments, combined with the palaeomagnetic ages, have enabled existing planktonic foraminiferal zonations to be tested and a new zonation for the mid- to high latitudes to be erected. The PL zonation of Berggren (1973, 1977) is shown to be adequate as far north as 41°N, although both the LAD's ofGlobigerina nepenthes andGloborotalia margaritae occur earlier than in tropical regions. North of 41°N these two species have very diachronous LAD's, even though they are common during their range in the northern sites. The new zonation for the mid to high latitude North Atlantic is based on the FAD ofG. margaritae, FAD ofG. puncticulata, LAD ofG. cf. crassula, LAD ofN. atlantica, FAD ofG. inflata and FAD of sinistrally coiled encrustedN. pachyderma. |
