Arkell.1956.Jurassic..

274 NORTH AFRICA
is thickly developed in the Jebel Nador area, judging by records of late-
Oxfordian Perisphinctids such as P. cf. microplicatilis (Quenst.), P. cf.
divisus (Quenst.) and P. cf. grandiplex (Quenst.) in beds overlying the
Transversarium fauna (Deleau, 1948, p. 39). Peltoceras bimammatum
is also recorded from the Hodna Mountains (Bou-Thaleb: Savornin,
1920, p. 158) and Ochetoceras marantianum from Jebel Zaghouan (Solignac,
FIG. 36.—Jurassic outcrops of north-eastern Tunisia. After Solignac (1947)
and others.
1947, facing p. 16). Spath's lists of ammonites from Jebel Zaghouan
(1913, p. 544) suggest a passage from the Transversarium Zone up into
the Lower Kimeridgian, with the Bimammatum Zone well represented
though not separated in the field.
The Transversarium Zone is developed in ammonitico rosso facies
like the Toarcian (Dalloni, 1936, p. 12) and is extremely rich in ammonites.
The assemblage is typical of southern France and the Jura. In the Jebel
Nador area the same fauna occurs in black marls with bands of marly
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