Arkell.1956.Jurassic..

l82 THE BALKAN PENINSULA
The lower or Tenuilobatus Zone is characterized by Holcophylloceras
polyolcum (Ben.), Phylloceras isotypum (Ben.), Taramelliceras trachynotum
(Op.), Aspidoceras uhlandi (Op.), A. zeuschneri Zit., A. deaki H., Pseudosimoceras
herbichi (Hauer), P. teres (N.), Ataxioceras fasciferum (N.) et
spp., Sutneria spp.
FIG. 19.—The Oriental Island (shaded; at the time of the Lias, after Pompeckj; the eastern
bulge and the south-west coast modified to exclude outcrops since discovered in the
Stranca Mountains and Argolis. The edge of the Russian mainland is also shaded.
Unfortunately the horizon of some of the most interesting forms is
still unknown: among them Hemihaploceras nobile (N.) (type of the genus),
Semiformiceras darwini (N.), Simocosmoceras nitidulum (N.), Katroliceras
acer (N.), Pseudowaagenia haynaldi (H.) (type of the genus), and most of
the remarkable Perisphinctids. Many species, including Aspidoceras
acanthicum, Lytoceras polycyclum and Phylloceratids, range through both
zones. Pygope janitor is confined to the Beckeri Zone.
In the region of the Iron Gates and also in the Transylvanian Alps
the Acanthicus Beds are absent, overlapped by the Tithonian.
OXFORDIAN
Apart from a small collection of Upper Oxfordian Perisphinctids and
Euaspidoceras from a locality in Banat (Neumayr, 1871, p. 356) no
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