Arkell.1956.Jurassic..

EAST OF THE PARIS BASIN 61
that in some places at least the upper part of the Macrocephalus Zone is
represented in the ironshot and condensed 'Callovian inferieur' (especially
in the Vosges department). Elsewhere, however, probably the Koenigi
Zone alone is represented in this, resting on the crinoidal Dalle nacree,
which represents the kamptus beds of the Macrocephalus Zone (see above,
p. 26). Finally, the lower division, or Macrocephalus Subzone s.s., is
developed, at least about Chaumont, as white oolite, previously regarded
as Bathonian, but yielding rarely enormous specimens of Macrocephalites
s.s. and an occasional Reineckeia (Maubeuge, 1952c). Between Chaumont
and Neufchateau this basal Macrocephalus Zone rests disconformably
on the Lower Bathonian. Elsewhere other zones of the Callovian also
overlap each other and on to Middle Jurassic; in the Ardennes the
Anceps Zone contains derived specimens of Proplanulites and Gowericeras,
and elsewhere the Athleta Zone overlaps the Anceps Zone (Bonte, 1939,
J
945)-
UPPER BATHONIAN (up to about 50 m.)
In the north, in the Ardennes, the Upper Bathonian is developed as
in the Boulonnais and in England. At the top is Lower Cornbrash, with
subzones of Ornithella obovata and Cererithyris intermedia, underlain by
oolitic marls and limestone with Rhynchonella elegantula like the Forest
Marble of the Boulonnais (le Wast), and brachiopod beds. Beneath this
again is typical White Limestone with Nerinea eudesii, overlying chalky
limestones with Rhynchonella concinna comparable to the Hampen Marly
Beds (Bonte, 1941, pp. 144-5).
Towards the south-east this well-differentiated series is replaced by
monotonous limestones, the Dalle d'Etain (20 m.), which may yet prove
to be (at least in part) Lower Callovian, but from which Dr Maubeuge
(1950, table) has sent me a Chqffatia belonging to an English Lower
Cornbrash species (unpublished) and a ? Procerites. In central Lorraine
a more varied succession of marls, limestones, and oyster lumachelles
comes in again, as follows (see Maubeuge, 1950, for correlation; and for
details Kliipfel, 1916; Frebold & Miilleried, 1923; Gardet, 1947):
Calcaires de Rouvres, with Clydoniceras, and beds with Gresslya
peregrina and Anisocardia nitida, 15 m.
Upper Ostrea knorri marls, 10 m.
Marls with Rhynchonelloidea alemanica Rollier sp. (=Rh. varians auct.;
see Gardet, 1947, pi. iv, figs. 1-12) upper part, =Marnes de Conflans,
upper part. From these beds I have seen Bullatimorphites bullatus
(d'Orb.) (typical), Choffatia cf. recuperoi (Gem.) and Oxycerites sp.
indet. (see Maubeuge, 1950); 20 m.
Farther south, at least between Neufchateau and Chaumont, the
Upper and Middle Bathonian are cut out by overlap of the Macrocephalus
Zone (Oolithe de Chaumont). Records show that Upper
Bathonian comes in again on the south side of the Paris Basin (de
Grossouvre, 1885, p. 368).
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