Arkell.1956.Jurassic..

SWABIAN AND FRANCONIAN ALB 113
Subzone of Virgataxioceras setatum (Schneid), with V. comatum (Schn.),
Hybonoticeras beckeri (Neum.), Enosphinctes rebholzi (Berck.), Ochetoceras
spp., etc.
Subzone of Enosphinctes subeumelus (Schneid), with ? E. minutus
(Berck.), 'Oppelia' fischeri Berck., 'O.' pseudopolitula Berck., ? Aspidoceras
hermanni Berck. and (?) Hybonoticeras cf. verestoicum (Herbich).
Only one of these genera is known in the English Kimeridge Clay, but
from the position of the zone above the Pseudomutabilis Zone and below
the Gravesia Zones, it must fall within the Middle Kimeridgian, of
which it is presumably a basal part, completely missing in England, as
suggested by Roll (1932). A stage-name, 'Suebium', has been suggested
for it (Hennig, 1943; P. Dorn, 1951, pi. 8).
FIG. 14.—Diagrammatic sections through Swabian sponge reefs before and after
faulting and subaerial erosion. After Roll.
LOWER KIMERIDGIAN
Zone of Aulacostephanus pseudomutabilis. As remarked above, the zone
is often lithologically inseparable from the Beckeri Zone, and even
palaeontologically Roll admits 15-30 m. of passage beds to the Subeumelus
Subzone. The Pseudomutabilis Zone is the Quaderkalk of Quenstedt.
From it have been figured Aulacostephanus pseudomutabilis (de Lor.),
A. eudoxus (d'Orb.), A. phorcus (Fontannes), Orthaspidoceras orthocerum
(d'Orb.), Nebrodites risgoviensis (Schneid) (all Schneid, 1914, pis. i, ii).
The commonest ammonites are various large Perisphinctids, most of
them belonging to the genus Progeronia (Schneid, 1914, pi. i, pi. ii, fig. 1;
Quenstedt, 1888, pi. 123); also ? Subdichotomoceras atavum (Schneid sp.,
1914, pi. ix, 1).
http://jurassic.ru/
H