Arkell.1956.Jurassic..

i94 THE BALKAN PENINSULA
flysch, which in the Ionian region is Burdigalian (Miogypsina limestone),
but not the transgressive Upper Miocene, of which the earliest known
fossiliferous part is Tortonian. (Renz, 1940, p. 149; 1947.)
The facies belts * and tectonic units deciphered by Renz are shown
in fig. 20. Pre-Carboniferous metamorphic rocks (unconformably
overlain by Upper Palaeozoic and Lower Triassic formations) occur as
three massifs. The ruins of the central massif (1) form the Cyclades
Islands, Attica, and southern Euboea. Flanking this are two elongate
massifs forming respectively (2) central Peloponnese and northern Crete,
and (3) Pelagonia, probably continuous with Lydia and Caria in Anatolia.
FIG. 20.—Sketch-map of Greece, Crete and the Aegean, showing the crystalline massifs
(shaded) and the facies-belts. After Renz, 1940. (The Tripolitza belt coincides
with the massif of central Peloponnese and northern Crete.)
Surrounding and overlapping tectonically the edges of the Attica-Cyclades
massif are nappes of Mesozoic and Eogene rocks which Renz (1940, p. 146)
postulates were squeezed from a now narrow strip pinched between the
Attica-Cyclades massif and the Pelagonic massif. These nappes form
most of Greece east of the Pindus Mountains. In north and central Greece
they override the border of the Olonos-Pindus series, and that series in
turn overrides the flysch border of the Adriatic-Ionic series, with the
development of imbricate structures which indicate westward movement.
It is the Adriatic-Ionic facies belt which mainly concerns us, representing
as it does a part of the autochthonous foreland. The Jurassic sequence '
in this area closely resembles that in the Apennines and is a direct
* Renz terms these facies and structure belts or tracts 'zones', but it seems preferable
to avoid using the word 'zone' in both vertical and horizontal senses in the same context.
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