GEOLOGIJA 34, 77-79 (1991), Ljubljana
UDK 56:551.761(497.16)=20
Calcareous Nannofossils in Middle Triassic (Anisian)
- A preliminary note -
Paola De Capoa
Dipartamento di Sc. della Terra, Università di Napoli Largo St. Marcellino 10, 80138 Napoli,
Italia
Rajka Radoičić
c/o Geozavod, P. O. Box 275, 11001 Beograd, Yugoslavia
Abstract
In this note nannofossils of Anisian age are reported in a Middle Triassic flysch
sequence in southern Montenegro (Dinarides). The rich and various nannofossils
are largely different from those described either in Paleozoic-Upper Triassic or in
younger rocks.
Anisian »flysch« discontinuously outcrops in a belt extending from some km
north of Budva dov^^n to the SW slope of the Rumija Mountain (Dimitrijevic,
1967), at a length of about 50 km and width of about 16 km. The complete Lower to
Middle Triassic sequence includes terrains spanning in age from Werfenian to
Anisian (»flysch« and Han Bulog limestones) and Ladinian (Porphyrite-Chert For-
mation). After the Carnian tectonic events, the southern sector of the »flysch« area
evolved into the Cukali-Budva Basin, and the northern sector evolved into the
Dinaric Carbonate Platform (Radoičić, 1987).
The Lower-Middle Anisian age of the »flysch« is proved by a rich macro- and
microfauna that includes, crinoids, brachiopods, bivalves, ammonites, algae (dasyc-
lads) and benthic foraminifers, and that was described by many authors (Bešić,
1959; Pantić-Prodanović, 1975).
The studied sequence (above 30 m thick) outcrops in the village Tudjemili, NNE of
Bar (southern Montenegro), and is made up of pelitic clayey-marly and calcareous-
marly deposits, which actually represent the distal deposits of the Anisian »flysch«.
Nine samples were collected, and they all contained calcareous nannofossils, gene-
rally in associations rich both in abundance of specimens and in morphologic variety.
All the forms we individuated represent new species (PI. 1, Figs. 1-5), except a form
showing affinities with Tetralithus pseudotrifidus Jafar, described in Upper Triassic
(Carnian-Rethian) of Austria and Southern Germany (Jafar, 1983). This species is
present with some specimens in the Tudjemili sequence.
The individuated species are being studied by optical microscopy and SEM.
78	Paola De Capoa & Rajka Radoičić
References
Bešić, Z . M. 1959, Geološki vodič kroz Narodnu republiku Crnu Goru. Geol. društvo NR
Crne Gore, 559 p., Titograd.
Dimitrijevič, M. N. 1967, Sedimentološko-stratigrafskiproblemi srednjotriaskog fliša
u terenima između Skadarskog jezera i Jadranskog mora. Geol. glasnik 5, 223-310. Titograd.
Ja far, S. A. 1983, Significance of Late Triassic calcareous Nannoplankton from Austria
and Southern Germany. N. Jb. Geol. Paläont. Abh. 166, 2, 218-259, Stuttgart.
Pantić-Prodanović, S. 1975, Trijaske mikrofacije Dinarida. Društvo za nauku i um-
jetnost Cme Gore, 4, 257 p., Titograd.
Radoičić, R. 1989, The Dinaric carbonate platform: adjacent basins depressions. Mem.
Soc. Geol. It. 40 (1987), 309-311, Roma.
Plate 1
1-5 Some of the recognized species
1	sp. 40, SEM, X 4000
2	sp. 38, SEM, X 4500
3	sp. 5, LM, X 1500
4	sp. 7, LM, X 1500
5	sp. 8, LM, X 1500
Calcareous Nannofossils in Middle Triassic	79