Robert W. SCOTT

5869

Numerical Ages of Selected Rudist Bivalvia: Preliminary Results

The ranges of most biostratigraphically diagnostic fossils have been calibrated to the geologic time scale in mega-annums. Five methods for integrating fossil ranges with the numerical geologic time scale are currently used: (1) species in stratigraphic positions with radiometrically dated beds; (2) strontium isotopes of unaltered shell material; (3) cyclostratigraphic frequencies of enclosing strata; (4) integration with zones and sequence stratigraphy; and (5) graphic correlation. Preliminary studies show that rudist occurrences have been calibrated in numerical ages by Sr isotopes, zonal integration and graphic correlation. Where the same species are dated by two methods, a more complete range is the result. The different methods not only complement each other, but also test each other. This preliminary survey demonstrates the feasibility of compiling an extensive stratigraphic database of each species and calibrating the numerical ranges in each section in order to define the maximum ages and the region of origins of rudist species.
Anahtar Kelimeler:

Turkish J. Earth Sci., 19, (2010), 769-790. Full text: pdf Other articles published in the same issue: Turkish J. Earth Sci., vol.19, iss.6.

Numerical Ages of Selected Rudist Bivalvia: Preliminary Results

The ranges of most biostratigraphically diagnostic fossils have been calibrated to the geologic time scale in mega-annums. Five methods for integrating fossil ranges with the numerical geologic time scale are currently used: (1) species in stratigraphic positions with radiometrically dated beds; (2) strontium isotopes of unaltered shell material; (3) cyclostratigraphic frequencies of enclosing strata; (4) integration with zones and sequence stratigraphy; and (5) graphic correlation. Preliminary studies show that rudist occurrences have been calibrated in numerical ages by Sr isotopes, zonal integration and graphic correlation. Where the same species are dated by two methods, a more complete range is the result. The different methods not only complement each other, but also test each other. This preliminary survey demonstrates the feasibility of compiling an extensive stratigraphic database of each species and calibrating the numerical ranges in each section in order to define the maximum ages and the region of origins of rudist species.
Keywords:

Turkish J. Earth Sci., 19, (2010), 769-790. Full text: pdf Other articles published in the same issue: Turkish J. Earth Sci., vol.19, iss.6.,

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Turkish Journal of Earth Sciences-Cover
  • ISSN: 1300-0985
  • Yayın Aralığı: 6
  • Yayıncı: TÜBİTAK
Arşiv
Sayıdaki Diğer Makaleler

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Maastrichtian Rudist Fauna from Tarbur Formation (Zagros Region, SW Iran): Preliminary Observations

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Blending Rudists with Technology; Non-destructive Examination of the Internal and External Structures of Rudists Using High Quality Scanning and Digital Imagery

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Albian rudist fauna from the Karaburun Peninsula, İzmir region, western Turkey

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Jean-pierre MASSE, Mükerrem FENERCİ-MASSE

Campanian pseudosabinia from the pučišća formation on the island of Hvar (Adriatic sea, Croatia)

Peter W. SKELTON, Blanka Cvetko TESOVIC, IVO RADOVANOVIC, Katarina KRIZMANIC, Thomas STEUBER, Tvrtko KORBAR

Distribution and Abundance of Rudist Bivalves in the Cretaceous Platform Sequences in Egypt: Time and Space

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Sakawa Bölgesindeki (Güneybatı Japonya) Titoniyen−Berriasiyen Yaşlı Torinosu Tipi Kireçtaşlarında Saptanan Epidiceras (Bivalvia, Hippuritoidea)

Shin-ichi Sano & Peter W. SKELTON

Epidiceras (Bivalvia, hippuritoidea) from the Tithonian–Berriasian Torinosu-type limestones of the Sakawa area, Southwest Japan

Peter W. SKELTON, Shin Ichi SANO