biostratigraphy and paleoecology of cretaceous/tertiary boundary in ...

Chapter Five
Conclusion
D - Qishlagh section 26 planktonic species were belonging to 13 Genus in
Tanjero Formation, while 42 benthonic species were belonging to 28 Genus in
Tanjero Formation.
E - Kato section 30 planktonic species were belonging to 14 Genus in Tanjero
Formation, while 38 benthonic species were belonging to 25 Genus in Tanjero
Formation.
10- Based on the geologic range and relative abundance of Planktonic
foraminiferal species, the studied sections along (K/T) boundary are precisely
divided into the numbers of biostratigraphic zones, depending on the new
zonal scheme as high resolution biostratigraphic studies, which are quietly
adequate and commonly used in low and middle latitudes. In addition to that,
these biostratigraphic zones were correlated to their equivalents in and outside
of the region and with world wide standard biostratigraphic zones with the aid
of datum events which show the age of planktonic foraminiferal zones. The
distinguished biostratigraphic zones in the studied sections are the following
from the base upward.
A - Gali section (Smaquli area)
a1 - upper part of Globotruncana aegyptiaca Interval Zone (CF8), (Upper part
of Shiranish Formation and Lower most part of Reddish to pale brown
succession) (Early Maastrichtian)
a2- Gansserina gansseri Interval Zone (CF7), (Reddish to pale brown
succession) (Early Maastrichtian)
a3 - Contusotruncana contusa Interval Zone (CF6), (Reddish to pale brown
succession), (Early Maastrichtian)
a4 - Pseudotextularia intermedia Interval Zone (CF5) (Reddish to pale brown
succession), (Early Maastrichtian)
a5 -Racemiguembelina fructicosa Interval Zone (CF4), (upper most part of
Reddish to pale brown succession and lower part of Tanjero Formation)
(Late Maastrichtian)
a6 - Pseudoguembelina hariaensis Interval Zone (CF3), (Tanjero Formation),
115