Arkell.1956.Jurassic..

35° RANGES OF SOUTH-WEST ASIA
(Jamesoni and Margaritatus Zones), Toarcian (Bifrons and Jurense
Zones), and Lower Bajocian (Opalinum Zone).
The Jurassic succession around Bayburt is about 2300 m. thick and is
as follows (Ketin, 1951, pp. 118-19):—
[Berriasian Metres
White limestones with Berriasella boisseri (Pictet), B. pontica Ret., etc. 1600]
Upper Jurassic
Sandy and conglomeratic beds with Aptychi . . . . . 300
Rose-red massive limestones with Aptychi 80 to 100
White, thin-bedded fossiliferous limestone with Soitxrbyceras
tortisulcatum (d'Orb.), Perisphinctids and brachiopods . . 4 to 5
Middle Jurassic missing ?
Lower Jurassic
Sandstones and shales with interbedded volcanic rocks . . . . 300 to 350
Lower Bajocian-Toarcian. Red fossiliferous limestones and marls with
the ammonite fauna of the 'Lias of Bayburt' . . .
Pliensbachian. Shales with thin volcanics, with Harpoceras and
. .
Amaltheus
to 10
cf. margaritatus
Bedded andesitic lavas and tuffs, with sandstones, sandy shales and marls .'
500 to 550
300 to 3\°
Sinemurian.
—-
Red fossiliferous
-
limestones and marls with
^.^01^11,0 anu minis wiui
Phylloceras
rnvuoceras
frondosum Reynes, P. alontinum Gem., P. bonarellii Bet., Vermiceras etc
50
Red sandy limestone, marl, and tuff; brachiopods
Lavas and tuffs
Sandstones, conglomerates, and sandy shales with Arietitids and brachiopods
100
250 to 300
[Metamorphic Series below.]
The Yakacik Lias also contains interbedded polygenetic conglomerates
(Bailey & McCallien, 1953, p. 427).
Omitting the great numbers of Phylloceratina and Lytoceratina, which
are useless for accurate dating, the following are some notable ammonite
genera and species.
Lower Bajocian, Opalinum Zone (Bayburt, Kayabashi)
Leioceras sp.
Walkericeras sp.
Erycites sp.
Toarcian, Jurense Zone (Bayburt)
Pleydellia aalensis (Ziet.)
Pseudolioceras
Pseudogramrnoceras
Dumortieria, 6 spp.
Phymatoceras tirolense (Hauer)
Toarcian, Bifrons Zone (Bayburt; ? Kesiktash)
Hildoceras spp.
Hildaites sp.
Catacoeloceras spp.
Pliensbachian, Margaritatus Zone (Merzifun, Kesiktash)
Arieticeras
Coeloceras limatum Pompeckj
Coeloceras spp.
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