| mhorn | Дата: Saturday, 09.02.2013, 22:22 | Сообщение # 1 |
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| Metodiev L.S., Rabrenović D., MojsićI., Ivanova D.K., Koleva-Rekalova E.K., Radulović V. (2013) The ammonites of the Bifrons Zone (Toarcian, Lower Jurassic) from Mihailovići (Northern Montenegro) // Comptes rendus de l’Académie bulgare des Sciences.
Tome 66, No 1. P.67-76.
pdf available from here: http://www.proceedings.bas.bg/
The base of the red pelagic nodular limestones exposed near the Mihailovici Pass (Northern Montenegro) yielded condensed Toarcian fossil assemblage con-sisting uniquely of ammonites. The ammonites were collected from marker horizon associated with prominent hardground surface. This assemblage is composed both of species of worldwide distribution and proper Tethyan dis-persal. It includes frequent Lytoceratina and common Phylloceratina and Ammonitina. The latter allowed the biostratigraphic definition of the fossil-iferous horizon as mid-Bifrons Subzone of the Lower Toarcian Bifrons Zone. Thirteen ammonite taxa were studied: Phylloceras heterophyllum (Sowerby), P. prinzi Geczy, Calliphylloceras nilssoni (Hebert), Lytoceras toarcense Rulleau, Nodicoeloceras angelonii (Ramaccioni), Hildoceras lusitanicum Meister, H. bifrons (Bruguiere), Cingolites aff. picenus Sassaroli & Venturi, Osperleioceras subexaratum (Bonarelli), Harpoceras mediterraneum Pinna, Phymatoceras anomalum Merla, Ph. gr. narbonense Buckman and Ph. cf. formosum Rulleau & Elmi. One specimen
was defined as Harpoceras sp. n. since it did not match any species from the literature, but might be erected as a new specific name if further materials appear.
Middle Jurassic - Lower Cretaceous ammonites & aptychi
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