Magnetic stratigraphy and biostratigraphy of the Piacenzian (Upper Pliocene) at Monte San Nicola (Sicily)
During the Neogene, the Mediterranean was a rather unique biogeographic province. For this reason, first and last occurrences of Neogene species recorded in the Mediterranean region may not be synchronous with those recorded in the open oceans. This has important implications as most of the Neogene stage boundaries are defined on the basis of Mediterranean type sections. The most direct way to determine the relative timing of Mediterranean and open ocean datums is through correlation with the polarity time scale. Such correlations are not available for the Mediterranean Pliocene. The Trubi pelagic limestones and Monte narbone marls which characterize the SicilianPliocene are not ideal for magnetic stratigraphy due to weak remnant intensities and an ubiquitous normal polarity overprint. However, at Monte San Nicola, a magnetic stratigraphy has been resolved by stepwise demagnetization in small temperature increments. The upper and lower bounds of the Gauss Epoch, and the Mammoth and Kaena polarity events can be correlated to well defined planktonic foraminiferal and calcareous nannofossil datums. Hence the synchronism of these datums between the Mediterranean and the open ocean can be tested. The most notable discrepancy is in the last occurrence of G. margaritae which occurs at the base of the Gauss in most open marine sections, but is found at the top of the Gilbert at Monte San Nicola.
- Research Organization:
- Univ. of Florida, Gainesville (USA)
- OSTI ID:
- 6877471
- Report Number(s):
- CONF-8510489-
- Journal Information:
- Geol. Soc. Am., Abstr. Programs; (United States), Vol. 17; Conference: 98. annual meeting of the Geological Society of America, Orlando, FL, USA, 28 Oct 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LIMESTONE
PALEOMAGNETISM
PALEONTOLOGY
STRATIGRAPHY
MARLSTONE
SICILY
FORAMINIFERA
GEOLOGIC FORMATIONS
MEDITERRANEAN SEA
PLANKTON
PLIOCENE EPOCH
ANIMALS
AQUATIC ORGANISMS
CARBONATE ROCKS
CENOZOIC ERA
EUROPE
GEOLOGIC AGES
GEOLOGY
INVERTEBRATES
ITALY
MAGNETISM
MICROORGANISMS
PROTOZOA
ROCKS
SARCODINA
SEAS
SEDIMENTARY ROCKS
SURFACE WATERS
TERTIARY PERIOD
WESTERN EUROPE
580100* - Geology & Hydrology- (-1989)