Arkell.1956.Jurassic..

366 RANGES OF SOUTH-WEST ASIA
mediterraneum, Parkinsonia parkinsoni, Perisphinctes martinsi. [Evidence
(or nomenclature) equivocal.]
4. A level with Oppelia fusca, Oppelia aspidoides, Lissoceras psilodiscus,
Strigoceras truellei, Cadomites linguiferus, Parkinsonia parkinsoni, P.
neuffensis, Perisphinctes martinsi, Phylloceras disputabile, Lytoceras adeloides,
L. tripartitum. [Apparently spans Upper Bajocian (Parkinsoni Zone)
and Lower Bathonian (Zigzag Zone).]
3. A level characterized by Oppelia subradiata (Sow.); with Strigoceras
truellei, Lissoceras cf. oolithicum, Cadomites linguiferus, Stephanoceras
humphriesianum, Parkinsonia parkinsoni, P. ferruginea, P. schloenbachi,
Perisphinctes martinsi, Morphoceras cf. dimorphum, Phylloceras viator,
P. deslongchampsi, P. mediterraneum, P. disputabile, P. velaini, Lytoceras
pygmaeum. [Upper Bajocian, assuming Stephanoceras humphriesianum
to be a misidentification.]
2. Grey shaly marls, 40-50 m., with some well-preserved ferruginous
Phylloceras and other ammonites generally crushed. Phylloceras disputabile,
P. circe, P. mediterraneum, P. velaini, with Posidonia alpina Gras var.
striatula Gemm. [Evidence insufficient for dating.]
ib. Sandy limestone, about 15 m., containing Sonninia sowerbyi,
belemnites and pelecypods. [Middle Bajocian, probably Sowerbyi Zone.]
la. Coarse sandstone, 2-3 m., with Pectenpumilus. [Lower Bajocian?]
This rests on the basalt flows and incorporates fragments derived from
them.
Lake Urmia
Fifty miles south of the Araxes at Julfa lies the great Lake Urmia
(Urmi, Urumiya, Ourmiah) (for a general account and good topographical
map see Gunther, 1899). The Sahend Mountains east of the lake produced
Jurassic ammonites which were long ago figured by Weithofer (1890),
who interpreted them as Lower Kimeridgian and Neocomian genera
(Ataxioceras and Olcostephanus) with some Toarcian (Harpoceras). Von
dem Borne (1891) on the basis of more material was able to confirm
the presence of Toarcian but showed that the remaining fauna is neither
Kimeridgian nor Neocomian but Middle Callovian (Anceps Zone). This
conclusion was reconfirmed by R. Douville on the strength of new
collections made (all from 5 m. of shales) by Mecquenem in 1905
(Mecquenem & R. Douville, 1908).
The ammonites so far known are as follows:—
MIDDLE CALLOVIAN (Anceps Zone)
From nodules embedded in black, bituminous, micaceous or sandy
shales, also crushed in calcareous shales:—
Parapatoceras calloviense (Morris) ]
Oppelia aff. subcostaria (Oppel) ,Tdent. R. Douville
Oppelia aff. aspidoides (Oppel) J
perhaps O. tsytovitchi Petitclerc ?
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