The siliciclastic beds outcropping around the village of Kuhlan, northwest Yemen
were originally designated the Kohlan Series. Later the sandstone part of the sequence
was renamed the Kuhlan Formation by the Yemeni Stratigraphic Commission. The
lower part of the Kuhlan Formation (Unit A) yielded diverse and well preserved
palynological assemblages. Their quantitative character and the presence of
Anapiculatisporites concinnus, Brevitrietes cornutus, B. parmatus, Deusilities tentus,
Dibolisporites disfacies, Microbaculispora tentula, Spelaeotriletes triangulus and
Verrucosisporites andersonii, suggests a confident correlation to the 2165A to 2141A
biozones of southern Oman, and to Arabian OSPZ2, indicating a late Carboniferous to
earliest Permian age for the unit rather than the late Triassic to early Jurassic age
given on the geological map of western Yemen. The date for the lower Kuhlan
Formation indicates that the underlying Akbra Formation is probably not younger
than the 2165A Biozone and therefore likely to be equivalent to the lower parts of the
Al Khlata Formation of Oman
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