Arkell.1956.Jurassic..

MIDDLE KIMERIDGIAN (60-70 m.)
EAST OF THE PARIS BASIN 57
The lower part of the Calcaires du Barrois (Salin, 1935) consists largely
of lithographic limestone, but contains a marl with Hemicidaris purbeckensis
and at top shelly limestones. Both above and below the marl occur
rather commonly Gravesia irius (d'Orb.), G. portlandica (de Loriol) and
G. gravesiana (d'Orb.). Other ammonites are Aulacostephanus autissiodorensis
(Cotteau) and Aspidoceras catalaunicum (de Loriol). (Figures in
de Loriol & Cotteau, 1868; de Loriol, Royer & Tombeck, 1872.)
LOWER KIMERIDGIAN (up to c. 150 m.)
The Lower Kimeridgian is difficult to correlate, owing to a high
proportion of oolites and other facies unfavourable to ammonites. Under
the Gigas Zone in the Haute Marne are 90-100 m. of limestones and
marls divided by de Loriol, Royer & Tombeck (1872) between their
zones of Aspicoderas caletanum (Oppel) above and Orthaspidoceras orthocerum
(d'Orb.) below. The upper zone (45 m.) contains A. caletanum,
Aulacostephanus cf. pseudomutabilis (de Loriol), Involuticeras erinum
(d'Orb.) and Enosphinctes eumelus (d'Orb.). The lower zone contains
O. orthocerum (d'Orb.), Physodoceras lallierianum (d'Orb.), Rasenia
decipiens (d'Orb. non Sow.), Aulacostephanus quenstedti Durand and
Ataxioceras lorioli Durand. It appears to have been from a conglomerate
at the base of this series that Rasenia cf. evoluta Salfeld was collected by
Maubeuge (1953). In that case these two Aspidoceratid zones represent
the three zones of Pseudomutabilis, Mutabilis, and Cymodoce.
Underneath come the following beds :—
Calcaire a Astartes, 25-30 m., the type formation of Marcou's Sequanien
stage; from this level 'Pictonia cymodoce' has repeatedly been recorded
(Abrard, 1929).
Oolithe de la Mothe, 7 m.
Lithographic limestones, 30-40 m., with the Oolithe de Saucourt in
the middle ('Corallien compacte', upper part).
From all these beds de Loriol, Royer & Tombeck recorded no ammonites
except the doubtful 'Perisphinctes achilles', but that at least the Calcaire
a Astartes is Lower Kimeridgian in Haute-Saone is confirmed by its
yielding Katroliceras aff. crussoliense (Font.) and Rasenia aff. trifurcata
(Rein.) (Petitclerc, 1916-17, pi. vii, 1, 2, pi. viii, 1-5). For the underlying
beds evidence is still needed. According to Corroy (1927, p. no),
Ataxioceras lothari (Oppel) is 'characteristic' of this group of beds, without
distinction of level, and if it is true that they are on the same horizon as
clays at Dompcevrin, Meuse, with A. lothari, Katroliceras crussoliense
(Font.), Progeronia ernesti (de Lor.), and P. lictor (Font.), they must be
still Kimeridgian, equivalent to the Lothari and Platynota subzones of
the Tenuilobatus Zone in SW. Germany. In NW. Europe it appears
that these Ataxioceras and Progeronia beds are missing; the extremely
thin Baylei Zone is no adequate equivalent.
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