The new shallow-water Bivalvia Janicula potens Community from the lower Gorstian carbonate platform influenced by the Svatý Jan Volcano activity in the Prague Basin, Bohemia is composed of 32 species [Slava sathon Køíž, 1985 (Slavidae); Cardiola donigala Køíž in Køíž & Serpagli, 1993, Cardiola signata Barrande, 1881, Cardiola aff. geminans Barrande, 1881 (Cardiolidae); Dualina amina sp. nov. (Antipleuridae); Mila parvula Køíž in Køíž & Serpagli, 1993 (Stolidotidae); Algerina aff. algena Køíž, 2008, Tetinka costulifera sp. nov. (Spanilidae); Macrodesma enigma sp. nov. (Cyrtodontidae); Phthonia regularis (Barrande, 1881) (Mytilidae); Ambonychia volitans (Barrande, 1881), Amphicoelia pojetana sp. nov., Mytilarca parens (Barrande, 1881), Mytilarca sp. (Ambonychiidae); Molinicola bohemica sp. nov. (Pterineidae); Palaeopecten radvani sp. nov., Palaeopecten sp. (Leiopectinidae); Rhombopteria perunicola sp. nov. (Rhombopteriidae); Praeostrea bohemica Barrande, 1881 (Praeostreidae); Butovicella migrans (Barrande, 1881) (Butovicellidae); Mimerodonta phaseolus sp. nov., Janicula potens (Barrande, 1881), Goniophora tyri Liljedahl, 1984, Goniophora ascia sp. nov., Goniophora compta sp. nov., Goniophora solci sp. nov., Goniophora sp. (Modiomorphidae); Goniophorina nitidula sp. nov. (Goniophorinidae); Cymatonota prolata sp. nov., Cimitaria liscina sp. nov., Cimitaria cf. liscina sp. nov., Sanguinolites? drupa sp. nov. (Grammysiidae)]. In the paper one new genus (Janicula gen. nov.), and 15 new species are described. The Janicula potens Community occupied the environment of protected well-ventilated shallow-water flats, locally overgrown by algae, with carbonate sedimentation influenced by direct ash falls and the subsequent sedimentation of volcaniclastics by currents around the volcanic archipelago. It is accompanied by a rich benthos, especially crinoids, corals, gastropods, and brachiopods together with abundant trilobites, rostroconchids, common cephalopods, stromatoporids, relatively rare ostracods, tergomyans, polyplacophorids, worms, bryozoans, sponges, and algae. It is classified as a part of the Coral-Crinoid Community Group which in the Prague Basin, Bohemia includes the homologous and analogous late Homerian, Wenlock Coral-Leptaenid Community, Hircinisca-Ancillotoechia Community, and Septatrypa lissodermis-Cyrtia maior Community, the early Gorstian, Ludlow Atrypa fumosa Community, and the Coniproetus-Protocymostrophia Community. The Janicula potens Community from the Lišèí Quarry locality near the Amerika gamekeeper’s lodge north of Karlštejn, Bohemia is the most diversified Bivalvia community in the Silurian of the Prague Basin. The lower Gorstian tuffaceous limestones, with more than 202 benthic and nektobenthic known species, represent the most fossiliferous Silurian level in the Prague Basin. The Janicula potens Community shows close palaeogeographic relationships with the upper Wenlock, Racine Formation reefs of Wisconsin and Illinois (North America), Silurian of Gotland and Dalarna (Sweden), Maine (North America), and Nova Scotia (Canada). • Key words: Bivalvia, Silurian, lower Ludlow, new taxa, palaeoecology, shallow water, volcaniclastics, Perunica, Prague Basin, Bohemia.

KØÍŽ, J. 2008. A new bivalve community from the lower Ludlow of the Prague Basin (Perunica, Bohemia). Bulletin of Geosciences 83(3), 237–280 (12 figures, 2 tables). Czech Geological Survey, Prague. ISSN 1214-1119. Manuscript received June 30, 2008; accepted in revised form August 12, 2008; issued September 30, 2008.

Jiøí Køíž, Czech Geological Survey, Klárov 3, P.O. Box 85, 118 21 Praha 1, Czech Republic; jiri.kriz@geology.cz

The lingulate brachiopod fauna of the mid-Devonian Acanthopyge Limestone, Choteè Formation of the Prague Basin, Czech Republic comprises seven species, of which Kosagitella pulsatilla sp. nov., Microbolus minimus gen. et sp. nov., Chynithele amoena sp. nov., and Opatrilkiella kobyla sp. nov. are described as new. Shell microornaments of all taxa are examined. The pitting on the mature shell of Kosagitella, and diverse types of pitting on discinid shells have been observed, including the imprints of suggested siliceous tablets on the first-formed shells of Acrosaccus and Opatrilkiella. • Key words: Barrandian, Silurian, Devonian, lingulid, glosseline, brachiopod, taxonomy, Czech Prague Basin.

MERGL, M. 2009. Lingulate brachiopods from the Acanthopyge Limestone (Eifelian) of the Barrandian, Czech Republic. Bulletin of Geosciences 83(3), 281–298 (10 figures). Czech Geological Survey, Prague. ISSN 1214-1119. Manuscript received August 4, 2008; accepted in revised form September 5, 2008, issued September 30, 2008.

Michal Mergl, Department of Biology, Faculty of Education, University of West Bohemia in Plzeò, Klatovská 51, 30619 Plzeò, Czech Republic; mmergl@kbi.zcu.cz

The modest faunule of silicified fossil demosponges, documented here, was recovered from the Upper Ordovician Montgomery Limestone in the Taylorsville area, in the northern Sierra Nevada of northern California. Included are specimens of the ceractinomorph angullongiid Amblysiphonelloidea tubulara Rigby & Potter, 1986, the girtyocoelliid Girtyocoeliana epiporata (Rigby & Potter, 1986), the sebargasiid Amblysiphonella sp., and the cliefdenellids Cliefdenella alaskaensis Stock, 1981, and Rigbyetia obconica (Rigby & Potter, 1986). In addition, specimens of the vaceletiid Corymbospongia adnata Rigby & Potter, 1986, are described and figured. The assemblage is closely related to faunules of sphinctozoan sponges earlier reported by Rigby & Potter (1986) from the eastern Klamath Mountains, to the west in northern California. • Key words: Ordovician, Montgomery Limestone, Sierra Nevada, California, Girtyocoeliana, Amblysiphonella, Cliefdenella, Rigbyetia, Corymbospongia.

RIGBY, J.K., POTTER, A.W. & ANDERSON, N.C. 2008. Ordovician sponges from the Montgomery Limestone, Taylorsville area, northern Sierra Nevada, California. Bulletin of Geosciences 83(3), 299-310 (5 figures). Czech Geological Survey, Prague. ISSN 1214-1119. Manuscript received June 27, 2008; accepted in revised form August 26, 2008; issued September 30, 2008.

J. Keith Rigby & Nicolle K. Anderson, Earth Sciences Museum, Department of Geological Sciences, Brigham Young University, Provo, Utah 84602-4606; rigbyjkeith@gmail.com, nikki.anderson2@gmail.com • Alfred W. Potter, Daniel B. Stephens & Associates, Inc., 4611 50th Street, Lubbock, Texas 79414; apotter@dbstephens.com

Crinoid faunas from scour and burrow fills in the basal portions of the Upper Turonian Teplice Formation at the locality Úpohlavy, Bohemian Cretaceous Basin (BCB) comprise the bourgueticrinid Bourgueticrinus ex gr. fischeri (Geinitz, 1872) represented by cups, proximalia and columnals and, in contrast, the comatulid Placometra ex gr. laticirra (Carpenter, 1880), new to the BCB, preserved as complete cups. Analysis of articulated portions of arms and dissociated brachials in the assemblages allows specimens to be identified and assigned to Bourgueticrinus ex gr. fischeri?, Placometra ex gr. laticirra?, Placometra? sp. and "Isocrinus" sp. The original echinoderm community also included an indeterminate bourgueticrinid with "rhizocrinid" columnals. Life habits and taphonomy of these crinoids are discussed. The type specimen of Bourgueticrinus fischeri from similar crinoid associations in Saxony is in need of revision. • Key words: Echinodermata, Crinoidea, taxonomy, taphonomy, Late Turonian, Bohemian Cretaceous Basin.

ŽÍTT, J. & VODRÁŽKA, R. 2008. New data on Late Turonian crinoids from the Bohemian Cretaceous Basin, Czech Republic. Bulletin of Geosciences 83(3), 311–326 (8 figures, 2 tables). Czech Geological Survey, Prague. ISSN 1214-1119. Manuscript received July 31, 2008; accepted in revised form September 1, 2008, issued September 30, 2008.

Jiøí Žítt, Academy of Sciences of the Czech Republic, Institute of Geology, Rozvojová 269, 165 02 Praha 6, Czech Republic; zitt@gli.cas.cz • Radek Vodrážka, Czech Geological Survey, Klárov 3/131, 118 21 Praha 1, Czech Republic; radek.vodrazka@geology.cz

Nautiloids of the order Tarphycerida are a characteristic component of warm-water Ordovician faunas of Baltica and Laurentia but are usually absent from the cooler high latitude marine environments. The presence of the tarphycerid Trocholites, reported from the Middle Ordovician, Dobrotivian (late Darriwilian) strata of the Iberian Chain and Armorican Massif (peri-Gondwanan Europe), provide an exception. Lituites primulus Barrande, 1865, represented by a single poorly-preserved individual was reported from coeval strata in the Prague Basin (Perunica) and doubtfully assigned to Curtoceras or Trocholites. New biostratigraphicaly well-constrained specimens of Trocholites described and discussed from the early Dobrotivian of the Prague Basin, are conspecific with Trocholites fugax previously described from the Iberian Chain and Armorican Massif. The contemporaneous presence of Trocholites fugax in Perunica and peri-Gondwanan terranes is additional evidence for faunal connections between these microcontinents during the Dobrotivian. By comparison with the preceding Llanvirnian (early Darriwilian) fauna, the low diversity Dobrotivian cephalopod fauna of the Prague Basin suggests an increasing faunal separation between Perunica and Baltica. The occurrence of Trocholites in early Dobrotivian strata of Perunica, the Iberian Chain and Armorican Massif reflects an unusual dispersion event of tarphycerids into lower latitude seas coinciding with a distinct climate perturbation during the Ordovician. • Key words: Middle Ordovician, Dobrotivian, Darriwilian, Cephalopoda, Tarphycerida, taxonomy, Prague Basin.

MANDA, Š. 2008. Trocholites Conrad, 1838 (Nautiloidea, Tarphycerida) in the Middle Ordovician of the Prague Basin and its palaeobiogeographical significance. Bulletin of Geosciences 83(3), 327–334 (4 figures, 1 table). Czech Geological Survey, Prague. ISSN 1214-1119. Manuscript received August 11, 2008; accepted in revised form September 1, 2008, issued September 30, 2008.

Štìpán Manda, Czech Geological Survey, Klárov 3, P.O.B. 85, 118 21 Praha 011, Czech Republic; manda@cgu.cz

Preliminary macro-petrographical analyses of samples taken from late Miocene (Pontian) to early Pliocene/Pleistocene lignite deposits at Achlada, northwestern Greece, show that there are two units in the lower 10 m of the lignite-bearing sequence. From 0 to 3.20 m a mixed xylite-rich /matrix lithotype is dominant and from 3.20 to 10 m a matrix-dominated lithotype is prevalent. The layers consist of organic and inorganic cyclical alternations with intercalated typical xylite horizons. The first results of coal petrographic analyses indicate a predominant huminite maceral group (60–81%) with a high content in liptinite (4–10%), and low in inertinite (0.2–2%). Plant association types revealed from palynological and seed and fruit analyses are open water, reedmoor, Taxodiaceae forest and mixed forest environments. Mineralogical research using X-ray diffraction (XRD), thermo-gravimetric (TG/DTG), differential thermal analysis (DTA), and Fourier Transform Infra Red (FT-IR) spectroscopy, shows that clay minerals prevail in all samples, with illite-muscovite being the dominant phase, followed by kaolinite and chlorite but with no smectite. The general area was a floodplain environment which included a large meandering river system. • Key words: Neogene, Pliocene, lignite, xylite, palaeoclimatology, palaeoenvironment, Greece.

OIKONOMOPOULOS, I., KAOURAS, G., ANTONIADIS, P., PERRAKI, T. & GREGOR, H.-J. 2008. Neogene Achlada lignite deposits in NW Greece. Bulletin of Geosciences 83(3), 335–338 (9 figures, 2 tables). Czech Geological Survey, Prague. ISSN 1214-1119. Manuscript received May 23, 2007; accepted in revised form January 16, 2008; issued September 30, 2008.

Ioannis Oikonomopoulos, Georgios Kaouras, Prodromos Antoniadis & Theodora Perraki, National Technical University of Athens, Department of Mining Engineering, 9 Iroon Polytechniou Street, 157 73 Athens, Greece; giannis@metal.ntua.gr, antoniad@metal.ntua.gr, peraki@metal.ntua.gr • Hans-Joachim Gregor, Palaeo-Bavarian Geological Survey, Daxer str. 21, D-82140 Olching, Germany; H.-J.Gregor@t-online.de

A theropod (Carcharodontosauridae) tooth exhibiting a split carina is the first recorded from upper Maastrichtian Marília Formation (Serra da Galga Member), Minas Gerais State, Brazil. The distal split carina has a distinct Y-shape. Split carinae have been reported elsewhere in Laurasian theropods (tyrannosaurids and allosaurids). • Key words: Cretaceous, Maastrichtian, Carcharodontosauridae, split carinae, tooth, pathology, Peirópolis, Brazil.

CANDEIRO, C.R.A. & TANKE, D.H. 2008. A pathological Late Cretaceous carcharodontosaurid tooth from Minas Gerais, Brazil. Bulletin of Geosciences 83(3), 351–354 (2 figures). Czech Geological Survey, Prague. ISSN 1214-1119. Manuscript received January 30, 2008; accepted in revised form July 18, 2008; issued September 30, 2008.

Carlos Roberto A. Candeiro, Laboratório de Paleobiologia, Curso de Ciências Biológicas, Campus de Porto Nacional, Universidade Federal do Tocantins, Rua 03, Qd. 17, s/nº - Jd. dos Ipês, Zip Code 77500-000, Porto Nacional, Tocantins State, Brazil; candeiro@yahoo.com.br • Darren H. Tanke, Royal Tyrrell Museum of Palaeontology, Box 7500, Drumheller, Alberta, T0J 0Y0, Canada; darren.tanke@gov.ab.ca