THE MEDITERRANEAN LOWER CRETACEOUS

8.2. The Hungarian Central Mountains
The section of the series is most complete at Bakony. The Berriasian sediments are
connected by lithological transition with the Tithonian deposits (Sumeg, Lokut
and Somhet). They are represented by light micritic limestones, clayey limestones
C'Biancone" facies) containing Berriasella privasensis (P i с t.), В. picteti (J a c),
Malbosiceras malbosi (P i с t.), Fauriella boissieri (P i с t.), Spiticeras spp., many
calpionellids and radiolaria. In the Alsomajor-Zirc valley and in the eastern part
of Somhet the Berriasian is represented by reddish limestones with ammonites or
by limestones with rare crinoids (fstenesmal-Zirc), while to the north of Zirc and
at Bakonycsernye it is represented by light limestones with calpionellids.
The Valanginian and the Hauterivian are not clearly differentiated. They are
represented by marls. In the Kôzôskut graben there are: Kilianella roubaudiana
(d'O r b.), Thurmanniceras thurmanni (P i с t., Cam p.), T. pertransiens (S a y n) and
Neocomites neocomiensis (d'O r b.), at Sumeg, Harskut and Lokut — Olcostephanus
astierianus (d'O г b.), above which at Lokut there are beds with Crioceratites.
Nannoconuses are also discovered.
The Barremian in the Marvanybanya region is represented by yellow-reddish
limestones among which there are Barremites, Hamulina and Valdedorsella. F ii-
1 ô p (1964) unjustifiably refers to this stage the glauconitic sandstones, marls and
sandy limestones with Deshayesites, Silesites and Mesohibolites, discovered in the
Kôzôskut graben. These are beds formed under condensation conditions and the
existence of Deshayesites indicates that they include the Lower Aptian as well. At
Sumeg the Barremian comprises a packet of marls with radiolaria and ammonites,
Hamulina paxilosa (U h 1.), Macroscaphites yvani (P u z.), Barremites spp., "Leptoceras"
parvulum (U h 1.), Nicklesia sp., etc.
The Aptian is represented by grey crinoid limestones which are traced from
Sumeg to the south through Varoslog, Harskut, Lokut, Zirc, Bakonycsernye to
Tata. There also occur limestones with gastropods, brachiopods and ammonites:
Cheloniceras martini occidentale (J а с), С. cf. cornuelianum (d'Orb.), С. cf. seminodosum
(S i n z.), Parahoplites cf. melchioris A n t h., Diadochoceras nodosocostatum
(d'O г b.), etc.
The Aptian usually starts with algal limestones, above which there are claystones
and marls with Orbitolinidae, covered by Urgonian limestones with rudists.
The Albian is represented by marls which are glauconitic in their upper part
and contain typically Upper Albian ammonites (N a g y, 1971).
• In the Tata horst (northwest of Tatabanya) near Kalvaria hill, the Berriasian
s represented by limestones with calpionellids, ammonites, belemnites, etc. F iiô
p (1976) reports a long list of characteristic Berriasian ammonites, which date
n a condensed section the entire volume of the stage from the P. grandis Zone to
the F. boissieri Zone. The descovery of Kilianella spp. and Neocomites is also evidence
about the existence of the Valanginian in the northern part of the horst.
Glauconitic sandy limestones, sandstones, marls and crinoid limestones, containing
rich Clansayesian fauna, overlie the deeply denuded surface of the Tithonian-Berriasian
(and in some places of Valanginian) limestones. Most of the fossils
are concentrated in the basal glauconitic layer, where they are also phosphatized.
F u 1 ô p (1976) has carried out a perfect investigation of this unique section which
is recognized as geological reserve.
To the northeast of Tata the Lower Cretaceous section ends with Albian marls
with glauconites, discovered at Vertes.
The Lower Cretaceous is also developed in the northern part of Gerecse (F u-
1 ô p, 1958), where it is connected with an uninterrupted complex from the upper
parts of the Berriasian to the Barremian included. Below there is a basal packet of
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