Arkell.1956.Jurassic..

EAST OF THE PARIS BASIN
Since most are misidentified, they may be listed here with revised
names :
Cardioceras cf. excavatum (Sow.) (Panthier, pi. iv)
Ochetoceras canaliculatum var. hispidum (Oppel) and an intermediate
variety ('montapinense' Panthier) (pi. v)
Perisphinctes cuneicostatus Arkell (type, P. martelli Klebelsberg, 1912,
pi. xviii, fig. 2) (pi. vi)
P. chloroolithicus (Giimbel) (pi. vii)
P. aff. cotovui Simionescu (pi. viii)
Euaspidoceras perarmatum (Sow.) (pi. ix)
E. (Paraspidoceras) chqffati (de Loriol) (pi. x)
E. nivernum Panthier (pi. xi) (indet. from figure)
It is to be hoped that the admirable remarks by Maubeuge (195 ib, p. 21)
will be taken to heart by future workers.
LOWER OXFORDIAN (up to 60 m.)
Zone of Cardioceras cordatum. The zone is widely represented, mainly
by two facies: Terrain a Chailles, and ironshot oolite. The 'chailles'
are chert nodules. The usual thickness is about 8-15 m. Locally,
however, these facies pass laterally into normal oolites (as in the Jura:
see p. 96) and then there is liable to be confusion with the overlying
zone. The fauna of the Cordatum Zone sensu stricto is best represented
by the Neuvizy Ironstone in the Ardennes, celebrated for its wealth of
ammonites in wonderful preservation (Arkell, 1948, p. 390). An Aspidoceratid
fauna mainly of this age has been figured from the ironstone of
the Cote d'Or by Collot (1917), and the Cardioceratidae and some
Perisphinctidae have been figured from there also (especially from Talent)
in several works by Maire (1938, 1940, and see references under Mariae
Zone). The typical ammonite assemblage is also recorded from the
Terrain a Chailles of the Toul district (Maubeuge, 1950c, p. 82) and the
Etain district (Maubeuge, 1952^, tableau), and a number of figures are
given by Petitclerc (1916-17).
Zone of Quenstedtoceras mariae. The typical facies is marls with
pyritized ammonites in great variety, dominated by Scarburgiceras,
Pavloviceras and Proscaphites, with Creniceras renggeri, Properisphinctes,
Prososphinctes, etc., but the zone also occurs as ironshot oolite as at
Talent, and as 'gaize', a siliceous marly sandstone (up to 50 m.). The
ammonites have been well illustrated in a number of works by Maire
(1908, 1928, 1932, 1932a, 1938, 1938a, 19386, 1940; lists for the Dijon
district also by Poinsot, 1939, under 'Praecordatum Zone'). The
assemblage is closely comparable with that in the Renggeri Marls of the
Jura and equivalent Upper Oxford Clay in the Boulonnais and England.
CALLOVIAN (up to 170 m.)
In the Woevre the whole Callovian is represented in clay facies which
passes up into the Lower Oxfordian, Mariae Zone. The full thickness
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