The Late Neogene: Biostratigraphy, Geochronology and by William A. Berggren and John A. van Couvering (Eds.)

By William A. Berggren and John A. van Couvering (Eds.)

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1971, p. ), whereas it is shown t o occur below the base of the D. hamatus Zone in Hays et al. (1972a, p. 61, 81). y. for the base of the D. hamatus Zone. y. y. y. It is apparent that we are dealing here with a very short zone. y. y. 0 in Site 63). , 1971, p. , 1972a, p. 48, 87-88). Thus the D. alata Zone is equivalent to calcareous nannofossil zones older than N N 8 and planktonic foraminifera1 zones older than N14. If the G. nepenthes Datum (N13/14) is approximately equivalent t o the NN9/8 boundary, which in thrn occurs within the mid-part of Magnetic Epoch 11,then the record of Globorotalia mayeri in the lower part of Magnetic Epoch 11 (Burckle, 1972) may well refer t o the presence of Zone N13, not necessarily N14.

44‘ 42. 4 2‘ 40. MEDITERRANEAN SEA TYRRHENIAN SEA 40‘ 38. 38‘ 4- 6’ 10. 14. 16. Fig. 7 . Late Cenozoic type localities in Italy. different workers in attempts to delineate the local stratigraphical succession in the Late Cenozoic of the Mediterranean region. The location of the various Late Neogene stage stratotypes in the Mediterranean is shown in Fig. 7. The name Tortonian is accepted by nearly all stratigraphers as a useful stage in the Miocene, although it is doubtful whether many could delineate its exact chronostratigraphical limits in regards to paleontological criteria.

S . is primarily, if not entirely, of Miocene age and much older than Piacenzian. It is more than likely that most of the various terms which have been used to designate time-stratigraphical units represent little more than rock-stratigraphical entities in local areas. From the point of view of chronostratigraphy most of the terms suggested as stage names in the Late Miocene-Early Pliocene are unsatisfactory. They are represented by brackish- or fresh-water sequences with restricted faunas, which do not allow satisfactory correlations outside the immediate area of their development.

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