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Budapest, Hungary

Ozsvart P.,Hungarian Academy of Sciences | Dosztaly L.,Hungarian Geological Institute | Migiros G.,Agricultural University of Athens | Tselepidis V.,Institute of Geology and Mineral Exploration | Kovacs S.,Eotvos Lorand University
International Journal of Earth Sciences

The Avdella Mélange in the northern Pindos Mountains and its equivalent formation, the Loggitsion Unit in the Othris Mountains expose early Mesozoic (Mid-Late Triassic) oceanic fragments beneath the Western Greek Ophiolite Belt of the Inner Hellenides, Northern Greece. The mélange consists of locally interfingering blocks and slices of ribbon radiolarite, radiolarian chert and pillow basalt and is usually overthrust by Jurassic ophiolites. New Middle and Upper Triassic radiolarian biostratigraphic data are presented from radiolarites and basalt-radiolarite sequences within mélange blocks. Pillow basalts associated with the radiolarites provide clues to the opening of the Neotethyan ocean basin. The radiolarians indicate a Middle Triassic age (latest Anisian, probably early Illyrian), which is documented for the first time in the northern Pindos Mountains. The new radiolarian biostratigraphic data suggest that rift-type basalt volcanism already began in pre-Ladinian time (late Scythian?-Anisian). These basalts were then overlain by Upper Anisian to Carnian (?Norian) radiolarites. © 2011 Springer-Verlag. Source

The present paper gives a systematic study of rodent and lagomorph remains together with the list of terrestrial molluscs recovered in the localities FT 3/8and FT 3/10. Miocene nonmarine deposits and fossils had been known from the beginning of the 20th century in the surroundings of the village Felso{double acute}tárkány,close to the town of Eger. An intensive sampling campaign was initiated by the first author in 2000. The collection was taken by screen-washing. Up to the present seven localities were studied. Among them, Felso{double acute}tárkány 3/8 and 3/10 occur in the highest lithostratigraphic position. The faunas of FT 3/8 and 3/10 are unusual due to the association of Vallesian rodents (e.g., Myoxus vallesiensis, Microtocricetus molassicus, Megacricetodon minutus) and Sarmatian molluscs (e.g., Perforatella punctigera, Pirenella picta nympha). The coexistence of Collimys and Microtocricetus is rare among the European Early Vallesian faunas. Another special character of the fauna FT 3/10 is the high frequency (53%) of Collimys. Th e biostratigraphic comparisons suggest that the age of the studied faunas cannot be younger than the A-B mollusc zones of the Vienna Basin (Fig. 11; Papp 1951) and fi ts with the lower part of MN 9 or perhaps the uppermost MN 7/8. Th is late Sarmatian-Early Pannonian period is imperfectly documented in the Central European Neogene. © Publications Scientifi ques du Muséum national d'Histoire naturelle, Paris. Source

Bitner M.A.,Polish Academy of Sciences | Dulai A.,Hungarian Natural History Museum | Kocsis L.,University of Lausanne | Muller P.M.,Hungarian Geological Institute
Annales Societatis Geologorum Poloniae

Lingulide brachiopods, assigned to Lingula dregeri Andreae, 1893, have been identified from the Middle Miocene (Upper Badenian) of the Hungarian part of the Pannonian Basin. Although widely distributed in the Miocene of the Central Paratethys (Austria, Poland, Ukraine, Romania), the genus Lingula was not described previously from Hungary. Outside of the Central Paratethys, L. dregeri also has been recognized in the Atlantic and Mediterranean provinces and most probably in the Eastern Paratethys. Source

Fejfar O.,Charles University | Heinrich W.-D.,Humboldt University of Berlin | Kordos L.,Hungarian Geological Institute | Maul L.C.,Senckenberg Institute
Palaeontologia Electronica

In response to environmental changes in the Northern hemisphere, several lines of brachyodont-bunodont cricetid rodents evolved during the Late Miocene as "microtoid cricetids." Major evolutionary trends include increase in the height of cheek tooth crowns and development of prismatic molars. Derived from a possible Megacricetodon or Democricetodon ancestry, highly specialised microtoid cricetids first appeared with Microtocricetus in the Early Vallesian (MN 9) of Eurasia. Because of the morphological diversity and degree of parallelism, phylogenetic relationships are difficult to detect. The Trilophomyinae, a more aberrant cricetid side branch, apparently became extinct without descendants. Two branches of microtoid cricetids can be recognized that evolved into "true" arvicolids: (1) Pannonicola (= Ischymomys) from the Late Vallesian (MN 10) to Middle Turolian (MN 12) of Eurasia most probably gave rise to the ondatrine lineage (Dolomys and Propliomys) and possibly to Dicrostonyx, whereas (2) Microtodon known from the Late Turolian (MN 13) and Early Ruscinian (MN 14) of Eurasia and possibly parts of North America evolved through Promimomys and Mimomys eventually to Microtus, Arvicola and other genera. The Ruscinian genus Tobienia is presumably the root of Lemmini. Under this hypothesis, in contrast to earlier views, two evolutionary sources of arvicolids would be taken into consideration. The ancestors of Pannonicola and Microtodon remain unknown, but the forerunner of Microtodon must have had a brachyodont-lophodont tooth crown pattern similar to that of Rotundomys bressanus from the Late Vallesian (MN 10) of Western Europe. Possibly, Pannonicola and Microtodon share a common ancestor. The fossil record suggests that an important center of origin for arvicolids was located in northeast Asia. From this region arvicolids could have dispersed to Europe and North America and vice versa during the late Cenozoic at various times. © Society of Vertebrate Paleontology November 2011. Source

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