Table of Contents for the Bulletin of Geosciences. List of articles from the latest print issue.http://www.geology.cz/bulletinen-US http://www.geology.cz/bulletin Zágoršek K, Radwańska U, Radwański A; Vol. 87, issue 2, pages 201 - 218
New cyclostome and cheilostome bryozoan material from the Korytnica Basin (Middle Miocene; Holy Cross Mountains, Central Poland) has yielded 51 taxa (with some remaining in open nomenclature), among which Stephanollona korytnicensis sp. nov. is established as new to science. The occurrence of the previously known free-living cheilostomes (Cupuladria, Reussirella, Lunulites) and boring ctenostomes is reviewed with regard to the phenomenon of the Bryozoan Event which spread over the Paratethys basins in Europe. The extreme shallowness of this basin and its apparently peculiar environmental conditions are inferred to have prevented the contemporaneous Bryozoan Event from developing here within the world-famous organic communities of the Korytnica Basin ]]> http://www.geology.cz/bulletin/contents/art1249_Zagorsek.pdf http://www.geology.cz/bulletin/contents/art1249_Zagorsek.pdf McKellar RC, Chatterton BDE, Meinhold G, Ben Rahuma MM; Vol. 87, issue 2, pages 219 - 225
A new phacopid trilobite is described from the Givetian sequence of the Awaynat Wanin Group in the southern Ghadamis Basin, Libya. The specimen displays most of the eye and sculpture features necessary for a determination and can be restricted to Pedinopariops (Hypsipariops) Struve, 1982. The new specimen does not belong to any taxon known so far and hence is considered to be a new species. The specimen remains in open nomenclature and is assigned to Pedinopariops (Hypsipariops) sp. nov. A. This is the first Devonian trilobite described from Libya, and represents an unusual occurrence of Phacopidae in a relatively coarse siliciclastic facies. ]]> http://www.geology.cz/bulletin/contents/art1286_McKellar.pdf http://www.geology.cz/bulletin/contents/art1286_McKellar.pdf Prieto J, Hoek Ostende LW van den, Hír J; Vol. 87, issue 2, pages 227 - 240
Large and well preserved micro-mammal faunas are available from the Middle Miocene from Hungary, but very little attention was paid on insectivores, although this group provides good palaeoenvironmental and palaeogeographical indication. As a first step we review the material from Sámsonháza 3 (Hungary, Nógrád County), based on both published and new fossils. We report the dimylid Plesiodimylus sp., the soricid cf. Paenelimnoecus sp. and an indeterminate shrew. The erinaceids Parasorex sp. and Lantanotherium sp., and the talpid Desmanodon sp. are described for the first time from Hungarian deposits. The fauna indicates a relatively wet environment and is in agreement with the Middle Badenian correlation proposed on the basis of the rich molluscan fauna of the locality. ]]> http://www.geology.cz/bulletin/contents/art1296_Prieto.pdf http://www.geology.cz/bulletin/contents/art1296_Prieto.pdf Valent M, Fatka O, Szabad M, Micka V, Marek L; Vol. 87, issue 2, pages 241 - 248
Two orthothecid hyoliths Probactrotheca briketa new genus and new species and Circotheca smetanai new species are described from the Middle Cambrian Buchava Formation of the Skryje-Týřovice Basin in the Czech Republic. The new forms are based on about twenty well-preserved external and internal moulds of opercula and conchs. The stratigraphic range and geographic distributions for both taxa are well known. ]]> http://www.geology.cz/bulletin/contents/art1142_Valent.pdf http://www.geology.cz/bulletin/contents/art1142_Valent.pdf Gelfo JN, Lorente M ; Vol. 87, issue 2, pages 249 - 259
Postcranial characters of South American native ungulates are important in order to analyze their relationships in the actual therian taxonomy, particularly to test their alleged afrotherian affinities. In this sense, the most primitive and oldest South American eutherians are represented by two endemic groups of “condylarths”, the Kollpaniinae and Didolodontidae. These forms, characterized by lower crowned bunodont dentition, have never been found in direct association with their postcranial remains. Even though, several skeletal elements have been assigned to some of forms, following different assumptions and criteria. Two distinct astragalar remains (MACN-CA 10737 and AMNH 117457) have been referred to the genus Didolodus, one of the most common didolodontids from early and middle Eocene Patagonian outcrops. Here we describe in detail and illustrate these materials. A critical analysis is made of several regression equation models which have been used in other cases to associate by size isolated postcranial elements to taxa defined by teeth. A new model was formulated based on 19 modern bunodont mammals with directly associated skeletons in order to test the accuracy of the regression equations. Although the results of the equation models failed to accuratly assigned the isolated astragali to any of the Didolodus species, they can be used as a good tool to disprove the association hypothesis. A broad comparison with astragalar remains of South American native ungulates indicates that MACN-CA 10737 has notoungulate affinities, in contrast AMNH 117457 resembles the astragali assigned to didolodontids from São José de Itaboraí, Brazil, according to the models criticized here. The similitude is particularly due to the broad development of the cotylar fossa, a character proposed as an afrotherian synapomorphy, but probably developed independently in different groups. Improvement in knowledge regarding postcranial characters of the earliest South American native ungulates is necessary not only due to its importance in improving accuracy of phylogenetic relationships, but also for the inferences made on paleobiological features. ]]> http://www.geology.cz/bulletin/contents/art1301_Gelfo.pdf http://www.geology.cz/bulletin/contents/art1301_Gelfo.pdf Boucot AJ, Blodgett RB, Rohr DM ; Vol. 87, issue 2, pages 261 - 267
The atrypid brachiopod Strophatrypa skaflestadi gen. et sp. nov. occurs in unnamed upper Silurian strata exposed near the town of Hoonah on northeast Chichagof Island, Southeast Alaska. The new genus represents the first strophic atrypoid with many characters otherwise similar to those of the Atrypidae. Although this genus is known from only a single bed at one Alaskan locality, its unique morphology is worth noting in anticipation that similar forms may be discovered elsewhere in the Alexander terrane, or especially somewhere in Siberia where other taxa restricted to the Silurian of the Alexander terrane are shared. This paper represents a further contribution to our limited knowledge of the Silurian brachiopods of the Alexander terrane of Southeast Alaska. ]]> http://www.geology.cz/bulletin/contents/art1285_Boucot.pdf http://www.geology.cz/bulletin/contents/art1285_Boucot.pdf Racheboeuf PR, Casier J-G, Plusquellec Y, Toro M, Mendoza D, Pires de Carvalho M, Le Herisse A, Paris F, Fernandez-Martinez E, Tourneur F, Broutin J, Crasquin S, Janvier P; Vol. 87, issue 2, pages 269 - 314
In order to precisely establish the bio- and chronostratigraphic position of several levels of the Silurian–Devonian succession of Bolivia, with respect to the International Time Scale, additional Silurian and Devonian localities belonging to the Eastern Cordillera and the Interandean Zone areas have been recently revised and sampled, both for macrofossils and palynomorphs. Specifically, the localities are Ñuñumayani, and Muruhuta from the late Silurian–early Devonian time interval. Correlations with other fossiliferous localities are discussed, namely Huacallani and Rumicorral. A new outcrop yielding Middle Devonian tabulate corals at Pisacaviña is described; its faunal content is described, and compared with the historical coral collection. As a result, it appears clearly that the Silurian–Devonian Bolivian fauna needs a thorough revision, as well as the selection of stratigraphically significant macrofossils. Besides macrofossils, the analysis of palynomorph assemblages is significant in establishment of both intra-Bolivian and international correlations before any reliable biogeographic reconstruction is done. This paper records the first discovery of a plant of the genus Protolepidodendron from the Devonian of Bolivia. An ostracod assemblage from Pisacaviña is described, illustrated, and discussed for the first time; it suggests an Early Devonian or an Eifelian age. Newly described taxa include the coral Parastriatopora boliviana sp. nov., and the chonetoidean brachiopods Sanjuanetes glemareci sp. nov., and Kentronetes giae sp. nov. ]]> http://www.geology.cz/bulletin/contents/art1248_Racheboeuf.pdf http://www.geology.cz/bulletin/contents/art1248_Racheboeuf.pdf Mergl M, Vodražkova S; Vol. 87, issue 2, pages 315 - 332
Taxonomic composition and stratigraphic distribution of lingulate brachiopod taxa around the Emsian/Eifelian boundary of the Prague Basin were examined. Twelve species have been determined and the presence of others is suggested. The prevalence of micromorphic biernatids, Havlicekion and Opsiconidion, in all the studied samples is significant. A mode of life for biernatids, especially from the genus Opsiconidion, is discussed. A new Devonian occurrence of the siphonotretid Orbaspina is recorded. Lingulate brachiopods do not display any significant change around the Emsian/Eifelian boundary or at the Basal Choteč Event (Middle Devonian, Eifelian, costatus Zone) and thus confirm the general uniformity of lingulate faunas in the Lower and early Middle Devonian. ]]> http://www.geology.cz/bulletin/contents/art1298_Mergl.pdf http://www.geology.cz/bulletin/contents/art1298_Mergl.pdf Steinová M; Vol. 87, issue 2, pages 333 - 346
The type species of Pseudocyrtodonta, P. ala and other two species P. incola, P. obtusa are known from the Middle and Upper Ordovician of the Prague Basin, Bohemia. Because of the actinodont type of the hinge, Pseudocyrtodonta is excluded from the subclass Protobranchia and is transferred to the Autobranchia, family Cycloconchidae. The family Pseudocyrtodontidae is considered invalid. Early and Middle Ordovician Cycloconchidae were highly diversified, containing 24 genera. Their diversity suddenly decreased during the Upper Ordovician to three genera only. The hinge of Pseudocyrtodonta could be considered morphologically close to the ancestral type of the hinge of the actinodonts. A complete species list of Ordovician actinodonts, including schematic figures of their hinge for the most important genera is presented. Pseudocyrtodonta was most probably an active burrower. ]]> http://www.geology.cz/bulletin/contents/art1330_Steinova.pdf http://www.geology.cz/bulletin/contents/art1330_Steinova.pdf Gourvennec R, Hoṣgör I; Vol. 87, issue 2, pages 347 - 358
Brachiopods recently collected from the Zap River Valley area (SE Turkey) allow to establish a Middle Devonian (upper Givetian) age for the upper middle part of the Yığınlı Formation which was until now considered as Famennian on the basis of its micropaleontological contents and of its relative position in the series. ]]> http://www.geology.cz/bulletin/contents/art1323_Gourvennec.pdf http://www.geology.cz/bulletin/contents/art1323_Gourvennec.pdf Hroch T, Rajchl M, Kraft P, Rapprich V ; Vol. 87, issue 2, pages 359 - 372
The basal Ordovician Třenice Formation represents an initial member of the preserved infill of the Prague Basin. Volcanic admixture in sediments preserved in the south-western part of the basin suggests subaerial volcanic activity during the deposition of the Třenice Formation. Three principal lithofacies associations were defined within sedimentary record of the Třenice Formation based on petrography and observed sedimentary structures: i) graded conglomerates, ii) lithic sandstones and iii) volcanigenic deposits. The studied sediments were mostly deposited as subtidal sand dunes, locally interbedded with volcaniclastic rocks. They are considered deposits of a marine lower shoreface influenced by ebb-tide currents. Volcaniclastic intercalations are interpreted as deposits of debris flows and turbidity currents that redeposited volcaniclastic material derived from subaerial Křivoklát-Rokycany and Strašice volcanic complexes. ]]> http://www.geology.cz/bulletin/contents/art1303_Hroch.pdf http://www.geology.cz/bulletin/contents/art1303_Hroch.pdf Silva RL, Mendonca Filho JG, da Silva FS, Duarte LV, Silva TF, Ferreira R, Azerêdo AC; Vol. 87, issue 2, pages 373 - 382
Data on lipids, carbohydrates and proteins of the most expressive black shale (s.l.) intervals of the Early-Late Pliensbachian (Early Jurassic, ˜187 Ma) organic-rich hemipelagic series of the Lusitanian Basin (Portugal) were determined using a method that has been successfully applied over the last two decades in the characterization of biomass and very immature sediments. The goal of this paper is to test the applicability of these techniques to the ancient geological record. To our knowledge, this is the first time that this type of biogeochemical data from sedimentary series older than Oligocene is reported and tentatively used for palaeoenvironmental/diagenetic inferences. Carbohydrates and proteins are present in low concentrations, reaching up to 385.13 and 451.13 μg/g rock, respectively. The main variations are observed in the lipid contents, ranging from 197.67 to 8446.36 μg/g rock. The samples with the highest amounts of lipids seem to correlate with low [O₂] time intervals determined by independent data, such as organic petrography, micropalaeontology and sedimentology. This was probably related with selective lipid preservation under oxygen and hydrogen sulfide-rich depleted environments. The good overall match between the determined lipid contents and specific depositional/early diagenetical conditions seem to favor the idea that the easy to perform and inexpensive method applied here has the potential to add useful information to the study of ancient organic-rich carbonate sedimentary series. ]]> http://www.geology.cz/bulletin/contents/art1315_Silva.pdf http://www.geology.cz/bulletin/contents/art1315_Silva.pdf Halásová E, Vašiček Z, Jansa L, Rehakova D, Skupien P; Vol. 87, issue 2, pages 383 - 406
Contact between the Upper Cretaceous rocks of the Subsilesian Nappe and the overthrust Lower Cretaceous rocks of the Silesian Nappe is uniquely exposed at locality Ostravice River Chanell. The deposits of the Silesian Nappe in the zone of overthrust plane that belong to the Hradiště Formation are tectonically affected. The more exact age of the mentioned rocks has never been documented earlier. The most significant stratigraphic data were obtained by the analysis of calcareous nannofossils. The sediments of the Hradiště Formation in the zone of overthrust of the Silesian Nappe belong to two partial tectonic slices. Sediments of slice on the contact between both the Nappes is, according to calcareous nannoplankton, of latest Hauterivian to Early Barremian age. In the area of the rapids, the other slice lying on it is of Late Hauterivian age. Micritic limestones occurring in the Late Hauterivian slice indicate basinal sedimentation above the carbonate dissolution level. Character of intercalated sandstones indicates of its turbiditic origin. Limestone interclasts in layers of gravelly sandstones document the erosion of the Upper Jurassic to early Lower Cretaceous carbonate platform by turbiditic currents. Further up the river, deposits belonging to higher, partial tectonic slices and stratal members of the Silesian Nappe were identified. At the beginning, a small part of the Veřovice Formation of Late Aptian age is exposed. After interruption, a huge outcrop of the Lhoty Formation of Middle and Late Albian age follows and then again the higher part of Hradiště Formation of Early Aptian age. ]]> http://www.geology.cz/bulletin/contents/art1326_Halasova.pdf http://www.geology.cz/bulletin/contents/art1326_Halasova.pdf