Magyarországi harmadidőszaki cephalopodák szisztematikai feldolgozása és paleobiogeográfiai - paleoökológiai kiértékelése = Systematics and paleobiogeographical-paleoecological evaluation of Tertiary cephalopods from Hungary

A magyarországi harmadidőszaki Cephalopodák vizsgálata hasznos és eredményes volt. Számos olyan helyről sikerült fejlábú maradványokat megismerni, ahonnan korábban ezek nem voltak ismertek. Jó néhány olyan fajt sikerül azonosítani, amelyet korábban Magyarországról nem ismertettek. A magyarországi Nautiloideákról legjobban ismert munkát a jelenleg elvárt szakmai szinten revideálni lehetett. A dudari Bayanoteuthisok alapján egy nemzetközi téren hangsúlyosan tárgyalt kérdéshez lehetett döntő módon hozzászólni. A líbiai anyag vizsgálatával fontos ősföldrajzi megállapításokat lehetett újabb adatokkal alátámasztani. Az eredmények megfelelő publikálása javarészt még hátra van. A kéziratok készültségi szintje és a további közlemények világosan látható körvonalai alapján az elvégzett munkák eredményei 2 éven belűl teljes mértékben közzétehetők. | The study of the Hungarian Tertiary Cephalopods proved useful and brought interesting results. Cephalopods were recognised and reported from several localities where previous reports did not note the presence of these fossils. Numerous forms which were recognised are genera and species previously unreported from the country. The work of V.Vogl of 1908 was revised. This is the best-known source about Hungarian Nautiloids, thus an up-to-date revision was necessary to give the informations on a scientific level of the day. The Bayanoteuthis records from Dudar are very important to argue in a question widely debated in the recent literature: these fossils prove that Belemnoid-type Cephalopods survived the mass extinction at the Cretaceous/Tertiary boundary. The study of the Nautiloids from Lybia proved that the 'Trans-Sahara Seaway' was an important faunal exchange route not only in the Cretaeceous, but also in the Paleocene. The publication of the results will continue in the future. On the basis of the state of the prepared manuscripts of papers the main results will be published within the next two years

Nautiloid cephalopods from the Middle Eocene of Iszkaszentgyörgy, Transdanubian Hungary

Two nautiloid specimens are described from the Transdanubian (West Hungarian) Middle Eocene. The specimens belong to the species Euciphoceras regale (J. SOW.) and Cimomia elliptica (SCHAFHÄUTL). While these Nautiloids represent a subordinate part of the otherwise very rich molluscan fauna of the localities, their appearance may suggest connections with areas in the wider paleogeographic surroundings

JURASSIC PALAEOGEOGRAPHY OF THE TRANSDANUBIAN CENTRAL RANGE (HUNGARY)

The Transdanubian Central Range (TCR) is a flattened range of hills in northern Transdanubia (Hungary), formed mainly by Mesozoic carbonate rocks showing strong facies similarities with the Southern Alps and the Austroalpine domain. The Jurassic system is divided into several formations of predominantly pelagic limestones. Ammonoids are frequent and were collected bed-by-bed in numerous sections, providing an excellent biostratigraphic resolution. The thickness of the Jurassic system is usually small but changes along the strike of the TCR. It reaches a maximum thickness of 500 m in the western part; is very variable (10-400 m) in the central segment (Bakony Mts.) and rather low (less than 100 m) in the east (Gerecse). In the Bakony segment, the thickness variation reflects the strongly dissected topography of the Jurassic sea-floor. Synsedimentary tectonics is dominated by normal faults; tilted blocks and listric faults may be inferred only in the east.Five main steps were identified in the palaeogeographic evolution: 1) Late Hettangian: carbonate oolitic shoals prevail, except for a few sites where non-deposition or neritic sediments occur. 2) Sinemurian and Pliensbachian: tectonic disintegration resulted in an intricate pattern of submarine horsts and intervening basins, with condensed sedimentation or non-deposition on the horsts and thicker, continuous sedimentary sequences in the basins. The submarine topographic highs are surrounded by aprons of redeposited material (scarp breccias, brachiopod coquinas, crinoidal calcarenites, spiculitic cherty limestones), while pure or argillaceous limestones (Rosso Ammonitico) prevail in the distal areas. 3) Early Toarcian: the Tethys-wide anoxic event is superimposed on the previous submarine bottom topography; the resulting black shales and sedimentary Mn-ores are concentrated on the western sides of some horsts. 4) Dogger to Early Malm: radiolarites with heterochronous lower and upper boundaries (Aalenian to Kimmeridgian) prevail, except for the top of some submarine topographic highs. The absence of uppermost Bathonian to Lower Oxfordian carbonates suggests that the whole TCR sunk below the CCD in those times. 5) Latest Jurassic: the uniform deposition of Rosso Ammonitico and Biancone in the Late Kimmeridgian and Tithonian is interrupted only in the Early Tithonian by local intercalations of scarp breccias and coarse biodetrital limestones. This is interpreted as the last manifestation of synsedimentary tectonic movements along the faults bordering the submarine horsts. Based on palaeogeographic similarities and analogies in Jurassic times, the TCR is visualized as the northern foreground of the Trento platform/plateau (lying north of the later Insubric lineament), where the block-tectonic disintegration and differential subsidence started earlier and resulted in a bottom morphology more dissected than in the South Alpine part of this west Tethyan passive margin.&nbsp

Macrocephalitid-bearing Lower Callovian (Middle Jurassic) beds in the Mecsek Mts (South Hungary)

In the former literature on the Jurassic of the Mecsek Mts it is traditionally taken as granted that the Middle Jurassic red, nodular, clayey limestone yields ’mixed’ Bathonian and Callovian (i.e. macrocephalitid) ammonites, thus stratigraphically was dated as ’Bathonian–Callovian’. A revision of the localities where macrocephalitids were previously recorded or recently found, resulted in a limited collection of well-localized ammonites. Evaluation of these ammonites led to the conclusion that Bathonian and Callovian faunal elements could be well-distinguished as coming from either the red nodular limestone or from the overlying yellowish, massive limestone. This latter can be firmly dated as earliest Callovian, on the basis of the co-occurrence of Bullatimorphites bullatus and Macrocephalites at least one locality, in the Mátépart ravine at the Hidas Valley. As for palaeogeography, the assemblages fit in well with the tendency of the Jurassic in southern Hungary, when lithological facies, and the faunal associations as well, show more and more Tethyan affinities as advancing in the Jurassic. The paper gives short descriptions of the localities and the most important ammonites of the Lower Callovian

Revision of the Middle Jurassic ammonite fauna from Csóka-hegy, Vértes Hills (Transdanubian Hungary)

In the Vertes Hills, a part of the Transdanubian Central Range, exposures of Middle Jurassic rocks are limited to some spots. The best-known occurrence is that on the Csoka-hegy, of which fauna was briefly described in 1960. The depositional and faunal features indicated a revision, what was made on the basis of the original materiai. The sediments are re-interpreted as fissure-filling materials of Middle Jurassic neptunian dykes, where a Bajocian and a Bathonian ammonite assemblage was recognized. The Bathonian fauna indicating the Oxycerites orbis Zone is richer and more interesting, because it contains forms which are interpreted here as cryptogenetic homoeomorphs. These previously less-known or unrecognized forms (e.g. “Morphoceras"gignouxi, ?“Dimorphinites" nodifer, special Epistrenoceras sp., etc.) were preserved here in this locality because the fissure-filling materia! escaped the normal sedimentologic and diagenetic processes which were general in the area of overwhelming radiolaritic deposition. In addition to these general conclusions, the paper gives short descriptions and figures of the characteristic Bajocian and Bathonian ammonites

A revision of VOGL's Eocene Nautilids from Hungary

Searching the collections of the Eötvös L. University of Budapest for Nautilids studied by V. VOGL in 1910, has yielded only a few surviving specimens. However, this limited material comprised several examples which were described and figured by VOGL. The revision resulted in identifying and properly describing six species of four genera (Euciphoceras regale, Eutrephoceras urbanus, E. centrale, Cimomia parallela, C. sp. and Angulithes sowerbyi). These forms all came from classic Upper Eocene localities in or near Budapest, and one from the Middle Eocene of Transylvania (Romania)

Ammonites from the Lower Bajocian (Middle Jurassic) beds of the classic locality of Bakonycsernye (Transdanubian Hungary), with special regard to the early otoitids and stephanoceratids

New collecting from the Middle Jurassic beds of the classic Bakonycsernye locality yielded very rich ammonite assemblages from the topmost Aalenian and the Lower Bajocian. A single bed, called here the Ovale Bed gave a high diversity Fissilobiceras ovale Zone fauna, with several stratigraphically diagnostic species and rich representation of early otoitids and stephanoceratids. These latters include topotypes of species described in classic monographs from this place. Here the earliest otoitids and stephanoceratids, Docidoceras wysogorskii and Westermannites chocsinskyi, respectively, appear first in beds belonging into the Graphoceras concavum Zone. The type horizon of W. telegdirothi, the best-known stephanoceratid from Csernye, most probably is within the Hyperlioceras discites Zone. Two new species are described, the otoitid Trilobiticeras (Emileites) kecskemetii n.sp. and the stephanoceratid Mollistephanus ottiliae n.sp., both form the Ovale Bed. Faunal affinities and the early development of the Otoitidae and Stephanoceratidae are discussed.Neubesammlungen der mitteljurassischen Schichten der klassischen Bakonycsernye Lokalität haben reiche Ammonitenvergesellschaftungen aus dem obersten Aalenium und unteren Bajocium erbracht. Aus einer Schicht, welche hier als Ovale Schicht bezeichnet wird, stammt eine diverse Fissilobiceras ovale Zone Fauna, die gleich mehrere stratigraphisch wichtige Taxa sowie frühe Otoitiden und Stephanoceratiden enthält. Letztere beinhalten Topotypen von Arten, die bereits in den klassischen Monoraphien über die Lokalität beschrieben wurden. Die frühesten Vertreter der Otoitiden und Stephanoceratiden, Docidoceras wysogorskii bzw. Westermannites chocsinskyi, erscheinen erstmalig in Schichten, die zur Graphoceras concavum Zone gehören. Der Typushorizont von W. telegdirothi, die am besten bekannte Stephanoceratidenart von Csernye, liegt sehr wahrscheinlich innerhalb der Hyperlioceras discites Zone. Zwei neue Taxa werden beschrieben, zum einen der Otoitide Trilobiticeras (Emileites) kecskemetii n. sp., zum anderen der Stephanoceratide Mollistephanus ottiliae n. sp. Beide stammen aus der Ovale Schicht. Die faunistischen Beziehungen sowie die frühe Entwicklung der Otoitidae und Stephanoceratidae werden diskutiert

Júra faunák visszatérése a toarci anoxikus sokk után (magyarországi vizsgálatok) = Return of the Jurassic fauna after the Toarcian anoxic shock, studied in the sections of Hungary

Magyarországon pliensbachi és toarci képződmények a Bakony, Gerecse és Mecsek hegységek rétegsoraiban tanulmányozhatók. A Bakonyban legrészletesebben a Bakonycsernyei Tűzköves árok ostracoda faunája került vizsgálatra. A pliensbachi és toarci fauna karakterisztikusan eltérő, legfeltűnőbb a Healdidae család képviselőinek hiánya a toarci emeletben. E változás - Nyugat-Európától eltérően - már a tenuicostatum zónában is észlelhető, ez az erősen kimélyült medence következménye. Ezért hiányoznak a Cytheridae-k is. A Gerecse hegység ostracoda faunája nagyon hasonló a Bakony hegységéhez. A Healdidae-k és Cytheridae-k eltűnnek a toarciban a medence mélyülése következtében. Cytheridae-k alárendelten még előfordulnak. A Mecsek hegységben a mélyszublitorális Healdidae együttest a tenuicostatum zóna felett sekély szublitorális Cytheridae-k dominanciájával jellemezhető együttes váltja fel. Ez a vízmedence mélységének csökkenésére utal. | The Pliensbachian and Toarcian sections in the Bakony, Gerecse and Mecsek Mountains were investigated. In the Bakony Mountains the Pliensbachian and Toarcian ostracod faunas show significant differences which are usually interpreted as related to the Lower Toarcian anoxic event. Main change is the disappearance of the Healdidae in the Lower Toarcian. The ostracod fauna of the Gerecse is very similar to that in the Bakony, here Healdidae and Cytheridae disappear in the Toarcian also, do to the deepening of the basin. In the Mecsek the deep sublittoral Healdidae assemblage is replaced by an assemblage dominated by shallow sublittoral Cytheridae above Tenuicostatum Zone, indicating the waterdepth changing to shallower