PALEONTOLOGICAL UPDATE OF DEALUL MELCILOR (BRASOV)

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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. References Baltres A., 1973 – Inventarul Hydrozoarelor si Chaetetidelor din Romania – Dari de seama ale sedintelor, vol LIX, Bucharest. Benda L., 1964 – Die Jura-Flora aus der Saighan- Serie Nord-Afghanistans – Geihefte Geologisches Jahrbuch, 70: 99-152, 11 Abb., 8 Tab., Hannover. Dragastan O., 1977 – Microfacies de la Serie Calcaire, Cretacee Inferieure d'Aliman (Dobrogea de Sud) – Dari de seama ale sedintelor, vol. LXIV, Bucharest, pp. 107-136. Dragastan O., Gradinaru E., 1975 – Asupra unor Alge, Foraminifere, Sphinctozoare si Microproblematice din Triasicul din Carpatii Orientali si Dobrogea de Nord – Studii si Cercetari Geologice, Geofizice, Geografice, Geologie series, T. 20, no., 2, Bucharest, pp. 247-254. Dragastan O., Neagu T., Barbulescu A., Pana I., 1998 – Jurasicul si Cretacicul din Dobrogea Centrala si de Sud (Paleontologie si Stratigrafie), Bucharest, pp.249, pl. I-LIV. Imlay R.W., 1955 – Characteristic Jurassic Mollusks from Northern Alaska – A Shorter Contribution to General Geology, Washington, pp. 69-93, pl. 1- 13. Jekelius E., 1925 - Die Mesozoischen Faunen der Berge von Brasso – III-VII. Die Dogger- und Malmfauna von Brasso – Mittheilungen aus dem Jahrbuche der Koniglich Ungarischen Geologischen Anstalt, Bd. XXIV, heft 2, Budapest, pp. 58-107, pl. I-III. Jekelius E., 1930 – Vorlaufige Mitteilung uber das Vorkommen eines weissen Triaskalkes bei Brasov (Kronstadt) – Bulletin de la Societe Roumaine de Geologie, Tome I, Bucharest, pp. 196-198, pl. I. Jekelius E., 1936 – Der Weisse Triaskalk von Brasov und Seine Fauna – Anuarul Institutului Geologic al 380 Romaniei, vol. XVII, 1932, Bucharest, pp. 1-106, pl. I-IX. Jekelius E., 1938 – Das Gebirge von Brasov – Anuarul Institutului Geologic al Romaniei, vol. XIX, Bucharest, pp. 379-408. Kühn O., 1936 – Die Anthozoen, Hydrozoen, Tabulaten und Bryozoen der Trias von Brasov (Kronstadt) – Anuarul Institutului Geologic al Romaniei, vol. XVII, Bucharest, pp. 109-132, pl. I. Macarovici N., Turculet I., 1972 – Paleontologia Stratigrafica a Romaniei, Bucharest, pp.263, pl. I- LXXXIV. Patrulius D., Bleahu M., Popescu I., Bordea S., 1971 – Guidebook to Excursion of the II-nd Triassic Colloquium Carpatho-Balkan Association – The Triassic Formations of the Apuseni Mountains and of the East Carpathian Bend – Guidebooks to Excursions, no. 8, Bucharest. Popa, M., 1997 – Corystospermal Pteridosperms in the Liassic Continental Deposits of Romania – Acta Paleontologica Romaniae, 1, Bucharest, pp. 81-86, pl. 8.I-8.II. Popa M.E., 2001 – Aspects of Romanian Early Jurassic Paleobotany and Palynology. Part IV.A New Species of Weltrichia from Anina – Studia Universitatis Babes-Bolyai, Geologia, XLVI, 2, 69- 76, Cluj-Napoca. Schweitzer H.-J., Kirchner M., van Konijnenburg-van Cittert J.H.A., 2000 – The Rhaeto-Jurassic Flora of Iran and Afghanistan. 12.Cycadophyta II.Nilssoniales – Palaeontographica, B 254 (1/3): 1-63, 24 pl., 23 fig., 3 tab., Stuttgart. Siblik M., 1998 – A Contribution to the Brachiopod Fauna of the “Oberrhatkalk” (Northern Calcareous Alps, Tyrol-Salzburg) – Jahrbuch der Geologischen Bundesanstalt, bd. 141, heft 1, Wien, pp. 73-95, pl. 1-3. Simionescu I., Barbu V.I., 1943 – Paleontologia Romaniei, Bucharest, pp. 120, pl. XIX.
PALEONTOLOGICAL UPDATE OF DEALUL MELCILOR (BRASOV) Volinet E.B., 2005 - Apt-Senomanskaia Flora Primoria. Statia 1.Floriceskie Komplexi – Stratigrafia. Gheologhiceskaia Korreliatia, t. 13, no. 5, pp. 60-79. van Waveren I.M., van Konijnenburg-van Cittert J.H.A., van der Burgh J., Dilcher D.L., 2002 – Macrofloral Remains from the Lower Cretaceous of the Leivaregion (Colombia) – Scripta Geologica, 123. Wietzke H., 1988 – Die Begleitfauna der Riffkorallen des Malm zeta 2 – Fundstellen Nattheim und Gerstetten in Suddeutschland – Arbeitskreis Palaontologie Hannover, 16 jahrgang, heft 4, Hannover, pp. 77-83, pl. I-II. von Zittel K. A., 1900 – Text-Book of Paleontology, vol. I, London, 706 pp., 1476 fig. Captions of Plates Plate I Fig. 1. Nilssonia orientalis (Heer) – Lias Fig. 2. Colospongia catenulata Ott – Ladinian (x7) Fig. 3. Colospongia catenulata Ott – longitudinal natural section (x7) Fig. 4. Colospongia catenulata Ott – internal structure in natural section (x7) Fig. 5. Colospongia catenulata Ott – osculum detail (x40) Fig. 6. Colospongia catenulata Ott – oscula detail (x40) Plate II Fig. 1. Colospongia catenulata Ott – osculum internal view (x40) Fig. 2. Colospongia catenulata Ott – pore pattern (x40) Fig. 3. Colospongia catenulata Ott – pore pattern (x40) Fig. 4. Chaetetopsis sp. n. - holotype – Tithonian Fig. 5. Chaetetopsis sp. n. - tabula detail on weathered side (x40) Fig. 6. Chaetetopsis sp. n. - polygonal individuals with very thin separation walls – thin section in polarized light (x40) Plate III Fig. 1. Chaetetopsis sp. n. - individuals sectioned longitudinally – thin section in polarized light (x40) Fig. 2. Chaetetopsis sp. n. - organic coloured levels – thin section in plain light (x40) Fig. 3. Rhaetina ex. gr. gregaria Suess – juvenile specimen - Triassic Fig. 4. Trochus sp. - juvenile specimen – Tithonian Fig. 5. Prosopon? sp. - Tithonian Fig. 6. Prosopon? sp. - carapace detail (x40) 381
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PALEONTOLOGICAL UPDATE OF DEALUL MELCILOR (BRASOV)

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