In the area of the Aggtelek-Rudabánya Mts, limestone and dolomite of reefal and lagoonal facies were formed on a platform, which was continuously deepening from the beginning of the Middle Triassic. The bulk of the limestone is represented by lagoonal formations, extremely rich in dasycladaceans. The reefal formations are of patch reef origin. The almost continuous development and the remarkable abundance of fossils permitted the elaboration of an Anisian-Carnian dasycladacean biostratigraphy. On the basis of investigations 4 assemblage zones could be separated in the Anisian, and 6 in the Ladinian-Carnian. In establishing this biostratigraphy dasycladacean investigations of similar facies areas of the Silica Plateau and the Northern Calcareous Alps were also taken into account.
In the Gerecse Mts,
Jurassic successions built of sedimentary rocks characteristic of the
peri-Mediterranean region are found. The lower part of the Toarcian stage,
largely representing the "Ammonitico Rosso marl" facies, contains
very diverse and abundant ammonite faunas. Bed-by-bed sampling of four sections
carried out during the late seventies and early eighties of the last century
has resulted in the collection of more than 15 000 specimens, the bulk of them
belonging to the orders Phylloceratina and Lytoceratina. Due to the presence of
very rare index forms of the suborder Ammonitina, the successions could be
fitted into the zonal scheme established for the NW European Toarcian. The aim
of the present paper is to provide information on the stratigraphic distribution
of Ammonitina in the Bifrons and Gradata Zones as well as to present a subzonal
subdivision of these beds.
Authors:Tamás Budai, János Haas, Harald Lobitzer, Olga Piros and Attila Vörös
The Middle Triassic
Wetterstein Limestone was investigated on the Feuerkogel, in the eastern
Höllengebirge area, Austria. Cephalopod-bearing coquina interbeds consisting
predominantly of orthocone cephalopods were found within the dasycladacean
inner platform lagoon facies. Based on sedimentological studies the coquina
beds are interpreted as storm accumulations. Dasycladacean biostratigraphic
data permit assigning the studied succession to the Late Anisian-Early Ladinian
interval. Ammonites of age-diagnostic value found in the coquina horizon
suggest the Avisianum Subzone of the Reitzi Zone that corresponds to the upper
part of the Anisian.
Afitsky , A.I.
1970 : Biostratigraphy of the Triassic and Jurassic deposits of the basin of the Bol'shoy Anyuy River Basin (Western Chukotka) . — Transactions of Scientific Research Institute, North East Complex, 26 , 148 p. (In Russian
Authors:István Vető, Katalin Báldi, Stjepan Ćorić, Magdolna Hetényi, Attila Demény and István Futó
) sediments cored between 400 and 700 m depth by the Ng 1 well. The biostratigraphy and the trophic status of the sea are based on the calcareous nannoplankton record, while recognizing water depth and the oxygenation of the bottom water is based on
A single tooth from the locality of Üröm-hegy (Hungary) was designated as the holotype specimen of “Archidiskodon meridionalis ürömensis” by Vörös (1979). The observed morphology of the tooth, with a minimum of 15 molar plates (most likely 17) led to the conclusion that this specimen belongs to Mammuthus trogontherii rather than a subspecies of M. meridionalis. On the basis of rodent biostratigraphy a date in the region of MIS 19-17 seems likely (i.e. c. 0.8 Ma — c. 0.7 Ma). Taking into account the meridionalis-like enamel thickness (3.1 to 3.4 mm, mean 3.2 mm) as well as the intermediate or slightly advanced relative crown height (1.65) and lamellar frequency (6), the specimen shows mosaic morphology, which fits well in the framework of the contemporaneous European mammoth-bearing localities (e.g. Voigtstedt). Taking all the evidence together it seems that this molar is not only a misinterpreted specimen, but a representative of a very important period of mammoth evolution in Eurasia, when M. meridionalis and M. trogontherii occurred together in Europe and when the genetic mixing between the adjacent populations resulted in a hybrid zone, which was responsible for mosaic or intermediate individuals, such as the holotype of “Archidiskodon meridionalis ürömensis”.
1997: Foraminiferal biostratigraphy of the uppermost Campanian--Maastrichtian in SW Crimea (Bakhchisaray and Chakhmakhly sections). -- Bulletin van het Koninklijk Belgisch Instituut Voor Naturwetenschappen. Sci. De la Terre Aarswetenschappen, 67, pp