Arkell.1956.Jurassic..

34° EAST AFRICA
Ankazoabo in the south-west, associated with forms of the early Plicatilis
Zone (Collignon, 1949), as in Tanganyika.
Mariae Zone. At Kilambia in the south-west an ironshot oolite has
yielded an assemblage of European Peltoceratids which might be early
Cordatum Zone but seem as a whole more likely of about Mariae Zone
age: P. annulare (Quenst.), P.praespissum Spath, P. cf. semirugosumWaagen,
P. interscissus Uhlig, P. torosum (Oppel), P. arduennense (d'Orb.). With
these is Paryphoceras cf. rugosum Spath, a species of the Dhosa Oolite
of Cutch. Another Cutch species common to Europe is found near by,
Cantpylites secula Spath (Collignon, 1949; Nicolai, 1950). In most places
the oolite and its ammonites do not occur; instead large areas are covered
by sandstones with Gryphaea dilatata (Basse, 1934, p. 71).
UPPER CALLOVIAN
A zone of Peltoceras athleta has been distinguished by a number of
authors (see Besairie, 1932, p. 180) but it is not clear that the Peltoceratids
are athleta or even necessarily Callovian species. The most unequivocal
Upper Callovian fauna is recorded by Basse (1934, p. 69) from 8 km.
SSE. of Ankazoabo in the south-west: she recognized Putealiceras
(3 spp.), Sublunuloceras and Distichoceras (Sindeites) associated with
Peltoceras athleta, in oolitic argillaceous sandstone overlying the yellow
Callovian oolite.
MIDDLE CALLOVIAN
If not Upper Callovian, the pyritic ammonites with Hecticoceratids
found in grey marls in the Pays Sakalave belong here as believed by
Barrabe (1929, p. 119; 1928, p. 1222); also beds on the banks of the Betsiboka
with 'numerous Hecticoceras and Pleurocephalites and Belemnites
tanganensis Futterer' (Besairie, 1932, p. 180). Spath (1925a, p. 25) also
saw a small assemblage with Pleurocephalites and Hecticoceras which he
tentatively assigned to the Anceps Zone. Reineckeia cf. anceps was recorded
by Lemoine (1907, p. 33 and 1910, pi. v, fig. 4) and also by Basse, (1934,
p. 63), associated with Sublunuloceras, Choffatia and Holcophylloceras
mediterraneum. Middle Callovian ammonites have also been obtained
east of Andranomantsy in the north (Collignon, 1953), and in the Mangoky
area in the south the earliest marine assemblage comprises Cutch forms of
Obtusicostites, Hubertoceras and Kinkeliniceras, with Phylloceratids, as in
the Mandawa area of Tanganyika (Hirtz, 1949, p. 6).
LOWER CALLOVIAN
In both the north and the south the Lower Callovian is conspicuously
represented by yellow or golden oolite with numerous fossils (H. Douville,
1904, p. 213). It is perfectly conformable with the Bathonian pelecypod
limestones and the passage is often gradual. Besairie (1932, p. 179)
recognizes two ammonite zones, a lower with Macrocephalites (Kamptokephalites)
aff. dimerus Waagen, an upper with M. madagascariensis
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