G. Klapper et al., UPPER DEVONIAN CONODONTS FROM THE TIMAN-PECHORA REGION, RUSSIA, AND CORRELATION WITH A FRASNIAN COMPOSITE STANDARD, Journal of paleontology, 70(1), 1996, pp. 129-150
A Frasnian composite standard provides a refined scaling for the thirt
een-fold conodont zonation first developed in the Montagne Noire, Fran
ce, but since replicated in North America, Australia, and now the Tima
n-Pechora region of Russia. Zones 4-13 are identifiable in seven cores
from the Ukhta area of southern Timan and a core from the Bagan Field
of the Khoreyver Basin. Scaling of the zones through graphic correlat
ion demonstrates the diachronism in different sections of the bases of
many conodont species, including those of zonally defining Palmatolep
is. This can be effectively shown in a correlation diagram scaled to a
composite standard based on graphic correlation, whereas it is obscur
ed by the assumption of synchronism inherent in conventional zonal cor
relation charts. Newly described species occurring in the Timan-Pechor
a region and elsewhere are Ozarkodina nonaginta, Ancyrognathus amplica
vus, Mesotaxis johnsoni, Palmatolepis amplificata, P. mucronata, P. or
mistoni, and P. timanensis. A number of other species described earlie
r from the region also occur outside Russia, mainly in Canada and Aust
ralia. Distribution patterns in the composite standard indicate close
faunal connections between the Timan-Pechora, western Canada, and West
ern Australia.