Abstract. The micropalaeontology of the mid-Cretaceous Derdere Formation (Mardin
Group) from outcrops close to the town of Derik in south-eastern Turkey is
described here. In thin sections from the carbonates that form the majority of
this formation, rich and diverse micropalaeontological assemblages are
present. These include larger benthonic foraminifera, planktonic
foraminifera, and other microfossils, including calcareous algae.
Alveolinid foraminifera are particularly common and include a new species – Simplalveolina mardinensis. In contrast to some previous studies, the majority of the section can be
demonstrated to be Cenomanian (notably middle Cenomanian) in age with no
confirmation of extension into the Albian or Turonian. Deposition took place
on a carbonate ramp within a range of discrete deposition settings ranging
from peritidal to outer ramp. A notable feature is the small-scale (a few
metres) shallowing-up cycles within the inner-ramp facies that may be
allocyclic or autocyclic in origin. Three major deepening events are
recognised within the succession, characterised by more open marine
microfauna and microfacies. These occur at the base of the formation,
within the mid-Cenomanian lower part, and towards the top of the formation.
These may correlate with three Cenomanian deepening phases seen in other
parts of the Arabian Plate.
scite is a Brooklyn-based startup that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.