New Zealand Journal of Geology and Geophysics abstracts
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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