Arkell.1956.Jurassic..

POLAND 479
fauna of the Tenuilobatus Zone of the Swabian and Franconian Jura,
characterized above all by a wealth of Ataxioceratids and Aspidoceratids,
with Prorasenia, Nebrodites ? and other genera (Premik, 1926).
UPPER OXFORDIAN
Bimammatum Zone, c. 200 m. To this zone apparently belong the
200 m. of bedded (Plattenkalk) limestones with large and small lenticles
of unbedded sponge-reef (Felsenkalk) limestones which Polish geologists
classify as 'Rauracien'. Epipeltoceras bimammatum and Perisphinctids
have been recorded (Siemiradzki, 1889, p. 53) but as a rule ammonites
are wanting. Instead the abundant brachiopods are used for correlation;
5 subzones are recognized (Rozycki, 1948).
Transversarium Zone, c. 110-150 m. Zawodzie Beds. A further
series of thick, white, bedded and in part chalky limestones, quarried for
lime especially about Czestochowa and rightly correlated with the Argovian,
yield many large Perisphinctids and other ammonites (monographed by
Bukowski, 1887 ; Siemiradzki, 1891, 1892 ; Klebelsberg, 1912). Peltoceras
(Gregoryceras) transversarium occurs in the higher part (Upper
Zawodzie Beds) (Rozycki, 1948, p. 18). The thickness of 110-150 m.
is developed in the hills SW. of the Lysa Gora (Swidzinski, 1931).
In the Czestochowa quarries it seems to be much less, and according to
Bukowski (1887, p. 92) all the other ammonites occur in the lowest 30 m.;
nevertheless he twice states (pp. 93, 94) that Perisphinctes wartae is found
only at a higher level than the others. The fauna comprises P. promiscuus
Buk., P. chloroolithicus Giimbel, P. biblex de Lor. non Sow., P. cotovui
Simionescu (= P. cristatus Klebelsberg, 1912, pi. xviii, fig. 3) and a great
variety of other Perisphinctids figured chiefly by Siemiradzki (1891),
with Euaspidoceras cf. perarmatum (Sow.), Goliathiceras, Vertebriceras,
etc. (Bukowski, 1887, p. 93). Specimens of large Perisphinctes cotovui
and P. maximus (Y. & B.) seen by me in Berlin came from Weilun and
also from far in the south-east, at Busk.
LOWER OXFORDIAN
Jasna Gora Beds. Below some undated limestones which form passagebeds
to the Zawodzie Beds and are of unstated thickness, is a 2 m. band
of white marl with interbedded thin marly limestones in layers and nodules,
often containing sponge-remains. From this bed Bukowski (1887, p. 87)
listed nearly 50 species of ammonites. They include Holcophylloceras
mediterraneum, but consist for the most part of Oppeliids (Ochetoceras,
Campylites, Trimarginites, Proscaphites, Creniceras, etc.), Cardioceratids,
Perisphinctids, Euaspidoceratids, and Peltoceratids. From Cardioceratids
such as C. (Scarburgiceras) bukowskii Maire (Bukowski, pi. ii, figs.
21, 22) and C. (Subvertebriceras) aff. sowerbyi Arkell (pi. ii, fig. 23), and
Perisphinctids such as P. (Prososphinctes) mazuricus Buk., P. (P.) consociatus
Buk., P. (P.) claromontanus Buk., P. (Mirosphinctes) mirus Buk. and
P. (M.) marsyus Buk., a late Lower Oxfordian age is evident (Cordatum
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