Arkell.1956.Jurassic..

THE ALPS AND NORTHERN CARPATHIANS
Phylloceras calypso (d'Orb.), P. semisulcatum (d'Orb.), Hemilytoceras
sutile (Oppel), Berriasella calisto (d'Orb.), which notoriously occur in
both Berriasian and Tithonian (Gerber, 1930). Calpionella alpina is
most abundant in the Berriasian but also occurs in the Upper Tithonian.]
UPPER TITHONIAN
In the same region (Gerber, 1930) in some places Berriasian ammonites
begin below the Cementstone beds, in the uppermost layers of the underlying
'Tithonian' limestone. Immediately below, in typical nodular
limestone and false breccia is an Upper Tithonian assemblage including
Berriasella privasensis (Pict.), B. calisto (d'Orb.), B. delphinensis (Kil.),
B. chaperi (Pict.), Dalmasiceras dalmasi (Pict.), Proniceras pronutn (Oppel),
Spiticeras groteanum (Oppel) [? pseudogroteanum Djan.]. A little lower,
in lithographic limestones, is the typical Stramberg fauna, including most
of the species above—B. privasensis, B. calisto, B. delphinensis, B. chaperi,
D. dalmasi, P. pronum—plus Berriasella oppeli (Kil.), B. richteri (Oppel),
B. lorioli (Zit.), Virgatosphinctes transitorius (Zit.), and Micracanthoceras
microcanthum (Oppel). A number of ammonites of this age are figured
from the Prealps of the Fribourg area by Favre (1880).
In the Au-Canisfluh area east of the Rhine, south of Lake Constance
(Boden See), the top o-6-i m. of the Tithonian limestones is a condensed
ammonite bed crowded with both Upper Tithonian and Berriasian
species (Heim & Baumberger, 1933, p. 161). This occurrence is valuable
as additional proof that there is no room for a disconformity and the
insertion of other faunas between the central European Upper Tithonian
and Berriasian. In the Churfirsten-AIvier group the lower part of the
Cementstone beds contains abundant Berriasella richteri (Oppel) and
B. lorioli (Zittel), and even at Canisfluh in places B. richteri and B.
carpathica (Zit.) are found with B. calisto in the cementstones immediately
above the ammonite bed (Schaad, 1926; Heim & Baumberger, 1933,
p. 165); the change from predominantly Tithonian to predominantly
Berriasian faunas therefore does not always coincide with the
lithological change from Tithonian limestones to Neocomian marls and
cementstones.
A Purbeckian phase with Chara has been traced in the Morcles, Aiguilles
Rouges and Valais regions (Murat, 1952).
MIDDLE TITHONIAN
Far away to the south-west, at Col du Lauzon, between Briancon and
Chateau Queyras (Hautes Alpes), another ammonite bed, 10-15 m
- thick,
occurs near the top of the limestones, here thick false breccias full of
Calpionella alpina and formerly worked under the name of Guillestre
Marble. The ammonites are extremely abundant and not rolled, but are
all small and difficult to identify. It is, however, a decidedly different
assemblage and shows marked affinity with the Rogoznik Beds of
the Carpathians (Blanchet, 1929). Besides numerous Phylloceratids,
http://jurassic.ru/