Arkell.1956.Jurassic..

SARDINIA 20I
indistinguishable from the Hauptrogenstein (now known to be Upper
Bajocian, not Bathonian).
The Upper Jurassic limestones, up to 200 m. thick, contain some badly
preserved small ammonites, but no attempt at even generic identification
has been published. The facies is that with Nerinea beds and corals,
reminiscent of Nattheim and many other places, and contrasting strongly
NEOCOMIAN
TABLE 15.—THE JURASSIC OF SARDINIA
NW. Coast South Centre East Coast
Limestones with Diceras, etc.
UPPER JURASSIC (up to 200 m.)
Light-coloured limestones
Sandy limestones
MIDDLE JURASSIC (up to 250 m.)
Grey limestones, Pholadomya murchis onae, etc.
Grey marly limestones, Pteroperna co statula, etc.
Limestones with Nerineidae and Rhynchonellids
('concinna')
Limestones and oolites, Pec ten
pumilus, etc.
Limestones with Pentacrinus
Cherty limestones, Ostrea acuminata
TRIASSIC
Gypsum and marls
Muschelkalk and dolomites
Bunter Sandstone
Dolomite
?
Sandstones with
plants
Crystalline
basement
Limestones with Exogyra
couloni and Leopoldia
White limestones,
Tithonian Nerineidae
Dolomite and lithographic
slates
Sandstone (local)
Crystalline basement
with the cephalopod-bearing Upper Jurassic and Tithonian of the
'Mediterranean' or 'Andalusian' facies. Most of the outcrops near the
east coast, marked as Cretaceous on the International Geological Map
and even in the most recent Italian atlas, were found by Deninger to
be Upper Jurassic and are so shown in fig. 22.
Table 15 summarizes the Sardinian Jurassic (Deninger, 1907).
SICILY
Across the length of Sicily, parallel to the north coast, are dotted
numerous small Jurassic outcrops which form part of more or less isolated
mountains of Mesozoic limestones surrounded by Tertiaries. The
Jurassic limestones are often hard to separate from thick marine Triassic
and Cretaceous rocks in similar facies. The outcrops are most numerous
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