Arkell.1956.Jurassic..

39° THE INDIAN PENINSULA
UPPER CALLOVIAN (Athleta Beds) (up to 21 m.).
The upper part of the Chari group below the Dhosa Oolite or its shales
consists of gypseous shales and marls known as the Athleta Beds, with an
extremely rich ammonite fauna. Spath (1933, pp. 775-9), mainly on
grounds of preservation, recognizes an upper and lower athleta fauna,
which he equates with the Lamberti and Athleta Zones respectively.
Both contain Oppeliids, Perisphinctids, Peltoceratids, Aspidoceratids and
Phylloceratids, making lists too lengthy even to summarize. The lower
fauna differs from the upper by including several late Reineckeids (Collotia
spp.), late Proplanulitids (Obtusicostites, Kinkeliniceras, Hubertoceras),
more Peltoceras s.s., and an Erymnoceras. The upper fauna is characterized
by several forms typical of the Lamberti Zone of England, such
as Distichoceras bicostatum (Stahl), Horioceras baugieri (d'Orb.), with some
even later elements more often associated with the Lower Oxfordian;
e.g. Euaspidoceras douvillei (Collot) and Properisphinctes bernensis (de
Loriol).
MIDDLE AND LOWER CALLOVIAN (Anceps, Rehmanni and Macrocephalus
Zones)
Next below follow limestones and shales with two slightly different
faunas, both characterized by numerous Reineckeia spp. and assigned to
the Anceps Zone. 'Species of Hubertoceras occur in both . . . but in the
lower beds they are associated with Reineckeia of the anceps group and
Kinkeliniceras angygaster and allies, and in the higher beds the first
Peltoceratids are accompanied by Reineckeites of the crispus-multicostatus
group' (Spath, 1933, p. 769). The long lists again contain some familiar
European forms, such as Oecoptychius refractus (Reinecke) as well as the
Phylloceratids, amidst a swarm of peculiar Indian elements. Here too
occurs Kinkeliniceras kinkelini (Dacque), a link with Tanganyika, where,
however, its associates suggest rather an Upper Callovian date (p. 329).
Perisphinctids—Grossouvria, Subgrossouvria, Choffatia and Orionoides—
are abundant. It is one of the ironies of world correlations that the only
Indian Erymnoceras known occurs in the Athleta Beds.
The lower part of the Callovian is probably more fully developed in
Cutch than anywhere else in the world. The combined Lower and Middle
Callovian are estimated to be 300 m. thick. The junction of Lower and
Middle Callovian cannot be drawn confidently at any precise horizon,
for exact correlation of the expanded succession of largely local oriental
elements with the usually more or less condensed sequence in Europe is
impossible. Spath regarded the Rehmanni Beds as equivalent to the
Calloviense and Koenigi Zones, but Callomon has shown that they are
more likely of the age of the Jason Zone, therefore early Middle Callovian.
I have myself found a fragment indistinguishable from R. rehmanni in
the Jason Zone at Peterborough. In the Rehmanni Zone of some localities
occur bands of Golden Oolite, but these are not developed at Jumara.
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