New Zealand Journal of Geology and Geophysics abstracts

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The Cenomanian/Turonian boundary in Sakhalin, Far East Russia: ammonites, inoceramids, foraminifera, and radiolarians

E. A. Yazykova

Department of Ecosystem Stratigraphy
Faculty of Earth Sciences
University of Silesia
Bedzinska str. 60
PL 41-200 Sosnowiec, Poland
email: yazykova@wnoz.us.edu.pl

D. Peryt

Institute of Paleobiology
Polish Academy of Sciences
Twarda str. 51/55
PL 00-818 Warsaw, Poland
d.peryt@twarda.pan.pl

T. D. Zonova

VNIGRI [All Russian Science Research Geological Petroleum Institute]
Litejny pr. 39
191104 Sankt-Petersburg, Russia

L. I. Kasintzova

VSEGEI [All Russian Science Research Geological Institute]
Srednij pr. 78
199106 Sankt-Petersburg, Russia

Abstract  The Cenomanian–Turonian succession of faunal assemblages identified in Sakhalin has enabled the establishment of 10 ammonite, 7 inoceramid, 4 radiolarian, and 2 foraminiferal zones, which correlate relatively well with those recorded for the northeastern region of Russia (Kamchatka and Koryakia) and for Japan. The problems surrounding placement of the Cenomanian/Turonian boundary in Sakhalin and in adjacent areas are reviewed. Significant macrofaunal turnover and radiation have been identified across the (locally defined) Cenomanian/Turonian boundary, as well as in the middle Turonian for ammonites and in the upper Turonian for inoceramids. The first occurrences of the widely distributed Pacific ammonite Jimboiceras planulatiforme (Jimbo), the cosmopolitan ammonite Fagesia, and the inoceramid Mytiloides aff. labiatus (Schlötheim), define the base of the Turonian Stage. The succession of foraminiferal assemblages does not exhibit any major extinction at the Cenomanian/Turonian boundary; however, a temporary faunal restructuring occurred at that time. The radiolarian fauna appears to have survived this interval without marked taxonomic change; a diversity decrease took place later, near the middle/late Turonian boundary.

Keywords   Cenomanian; Turonian; biostratigraphy; bioevents; diversity; correlation; ammonites; inoceramids; foraminifera; radiolarians; Naiba Formation; Bykov Formation; Sakhalin; Russia

G03006; Received 23 May 2003; accepted 8 December 2003; Online publication date 20 May 2004
New Zealand Journal of Geology & Geophysics, 2004, Vol. 47: 291–320
0028–8306/04/4702–0291 © The Royal Society of New Zealand 2004

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