Arkell.1956.Jurassic..

158 THE ALPS AND NORTHERN CARPATHIANS
The occurrence of Pygope janitor Pictet in the Hohmatt ammonite
bed (Rod, 1946, p. 189, pi. xiv) confirms observations of Favre (1877,
p. 107) in the Alps and Fontannes at Crussol that this striking brachiopod
occurs in the Middle Kimeridgian at least as early as the Beckeri Zone
and cannot be used as an index fossil for the Upper Tithonian Stramberg
Beds.
OXFORDIAN
As remarked above, both the Quintnerkalk in the north-east and the
Guillestre Marble in the south-west are believed to embrace at least part
of the Upper Oxfordian. Under the Quintnerkalk lies shaly Lower
Oxfordian (Heim & Baumberger, 1933, p. 160). The best Upper
Oxfordian ammonite faunas figured come from the Prealps. From Mont
des Voirons, 9 miles east of Geneva, Favre (1875) monographed an
assemblage of the Bimammatum Zone (with a number of ammonites from
the Lower Kimeridgian also figured, distinguished in the text only). In
the Fribourg Prealps he recognized two assemblages, one in grey nodular
limestone which seems to combine the Bimammatum and Transversarium
Zones, the other in red nodular limestones and cementstones underneath,
which appears to represent the Lower Oxfordian and contains Creniceras
dionysii (Mayer) (Favre, 1876). A noteworthy fossil from the upper level
is a Spiroceratid, Parapatoceras ischeri (Favre), the only known Oxfordian
uncoiled ammonoid. The Bruns group, south and SE. of Fribourg, has
been the subject of an elaborate stratigraphical revision by Horwitz (1940),
but the ammonites have not been figured, and from the palaeontological notes
it is certain (as he admits, p. 1) that the determinations require revision.
The Transversarium Zone is represented, and possibly some early Lower
Oxfordian (pp. 62-7). In the Morcles nappe and again in the Jungfrau-
Monch-Eiger range the Cordatum Zone is missing, and in the latter
the whole Lower Oxfordian, and the Transversarium Zone rests on an
eroded surface and incorporates derived fragments of earlier beds (Collet,
1943, p. 19; Collet & Parejas, 1931, p. n). A long list of ammonites,
mainly Hecticoceras and other Oppeliids, and Phylloceratids, from clays
below the Upper Oxfordian of the Morcles nappe, does not distinguish
species that belong to the Athleta and Mariae Zones, which here as often
are developed as a single series of clays.
CALLOVIAN
Considerable faunas of Lower, Middle and Upper Callovian dates
are listed from numerous places, by the authors just cited and others,
but figures are lacking. In the Jungfrau range the Lower and Middle
Callovian and Bathonian are condensed as ironshot oolite.
BATHONIAN
Scattered records of Upper Bathonian ammonites from various places
suggest that the Bathonian in the Alps may be more complete than
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