PALEONTOLOGICAL UPDATE OF DEALUL MELCILOR (BRASOV)

D. UNGUREANU
Dactylioceras commune is a biomarker for
Middle Toarcian, Bifrons zone, Sublevisoni subzone,
Commune horizon (the horizon no. VIII in
Toarcian biozonation), that is in the beginning
of Middle Toarcian.
Phylum Arthropoda Latreille, 1829 in Carus &
Gerstaecker, 1863
Subphylum Crustacea (Aristotelis, 1545)
Class Malacostraca Latreille, 1802 in Latreille,
1806
Order Decapoda Latreille, 1802 in Latreille,
1806
Genus Prosopon v. Meyer, 1835
Prosopon? sp.
Pl. III, fig. 5, 6
Genus mentioned by Jekelius in the
Tithonian of Dealul Melcilor (1925).
One well preserved specimen, in the
Tithonian limestone. It does not belong to any
of the Prosopon species mentioned here. The
width is larger than the length. The dimensions
are:
length: 6 mm
width: 8 mm
posterior width: 3 – 4 mm
The specimen presents an uro-genital
groove of V shape, or, rather in a shape of a
bracket opened frontwards. There are, also two
branchiocardiac grooves, that do not link
together.
The carapace has very fine nodules evenly
distributed on its surface (Pl. III, fig. 6).
Aknowledgements
I would like to thank to my colleague and
friend Eugen Barbu, as well to my son Catalin
Ungureanu, for their help in collecting the
fossils. Mrs. Anca Luca, teacher within the
Faculty of Geology in Bucharest, helped me
with making and analysing the thin sections. I
am grateful, also, to Prof. Eugen Gradinaru for
his information related to the previous research
in the studied area.
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