<abstract><title style='display:none'>Abstract</title>Thirty-two fossiliferous localities of the Olešná Member, a distinct unit of the Klabava Formation, are described. As we are able to find they represent all fossil sites of this unit ever been mentioned in publications. Fossil taxa from relevant papers are summarized and the historical names used for the localities are listed. Updated lists of fauna are compiled for each locality; based on them an overall list for the member is completed.</abstract>

Index of Fossiliferous Localities of the Olešná Member, Klabava Formation (Lower Ordovician of the Prague Basin, Czech Republic)

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<title style='display:none'>Abstract</title>
The extant plant genus Isoetes (Isoetaceae; lycophyte, quillwort) is important from an evolutionary point of view. Species of this heterosporous genus are small herbs (up to 50 centimeters) and exhibit some morphological, anatomical and embryological features of their Paleozoic arborescent lycopsid ancestors. The species Isoetes pantii produces three kinds of microspores (monolete, alete and trilete) and two types of trilete megaspores in one and the same heterosporangium. We attempt to associate these unusual functional megaspores with various Paleozoic spores described mainly from Devonian barinophytaleans such as Omniastrobus dawsonii, Barinophyton richardsonii, B. citrulliforme and Protobarinophyton pennsylvanicum. These have two kinds of spores in a sporangium and provide the first palynological evidence of heterospory at 405 Ma. The germination of microspores and megaspores and production of gametophytes within the heterosporangia of I. pantii corresponds with that of some of its Paleozoic ancestors. Retention of megaspores within heterosporangia and their germination in situ offers evidence that I. pantii exhibits the probable route of evolution of the seed habit. These observations support the hypothesis that a typical heterosporangium was the cradle for the evolution of heterospory.
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Heterosporangia in <italic>Isoetes Pantii</italic> (Isoetaceae, Pteridophyta): Revealing the Beginnings of Heterospory and Recalling Paleozoic Ancestors?

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<title style='display:none'>Abstract</title>
The deep-water Aulacopleura koninckii Assemblage in the lower Homerian (T. testis Sub-Biozone) “Aulacopleura shales“ strata at the classical ‘Barrande’s pits’ locality on the Černidla hillside at Loděnice in the Prague Basin is supplemented by the addition of two new trilobite taxa, viz. Exallaspis? perunicana sp. n. and Kosovoproetus? aff. praecursor (Přibyl &amp; Vaněk 1987). The palaeogeographic distribution of Exallapis Ramsköld &amp; Chatterton, 1991 is extended by the occurrence of Exallaspis? perunicana sp. n. and the younger Exallaspis sp. in the upper Homerian (the P. parvus – G. nassa Biozone) of the Prague Basin, reflecting the faunal migration between the southern shelf of the Baltica palaeocontinent and the Perunica microcontinent accross the Rheic Ocean. The small dimensions of the K.? aff. praecursor exoskeletons compared to those of K.? praecursor in the bordering shallow-water Liolalax–Sphaerexochus– Cheirurus Assemblage represent another example of adaptive nanism in trilobites of the Aulacopleura-Raphiophorus Biofacies.
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The Rare Trilobites <italic>Exallaspis</italic> (Odontopleuridae) and <italic>Kosovoproetus</italic>? (Tropidocoryphidae) in the Homerian (Silurian) Of The Prague Basin, Bohemian Massif

<abstract><title style='display:none'>Abstract</title>Litavkaspis rejkovicensis Fatka, Kordule et Šnajdr from the Příbram-Jince Basin has been known to occur in a roughly 30 m thick eponymous Taxon-range Zone situated in the lower parts of the Jince Formation (Cambrian, Drumian), within the Eccaparadoxides pusillus Interval Zone. A unique finding of a cranidium of Litavkaspis sp. at the locality Jince-Vystrkov, described in this report, comes from the middle parts of the Paradoxides gracilis Taxon-range Zone, lying roughly 250 m higher than the hitherto known biostratigraphically youngest occurrence of the index taxon. Specimens of Dawsonia bohemica (Šnajdr) from the Jince Formation have been collected exclusively in about 1 m thick deposits of the eponymous Taxon-range Zone situated stratigraphically at the base of the Onymagnostus hybridus Interval Zone. The findings of Dawsonia cf. bohemica presented herein come from the localities Rejkovice – Potůček in the Litavkaspis rejkovicensis Taxon-range Zone, and Rejkovice – Ve žlutých in the Acadolenus snajdri Interval Zone. Their stratigraphic positions are therefore 30–50 m lower than the typical occurrence of Dawsonia bohemica (Šnajdr) in the eponymous Taxon-range Zone.</abstract>

Biostratigraphically Important Findings of Two Index Trilobites from the Jince Formation (Cambrian, Drumian) of the Příbram-Jince Basin (Barrandian Area, Czech Republic)

<abstract><title style='display:none'>Abstract</title> This paper provides documentation of the Late Carboniferous flora of the Southern Karavanke Mountains in Slovenia that is housed in the Gornjesavski Muzej (Upper Sava Museum) in Jesenice, Slovenia. The paleoflora from this area has not been systematically documented until today. 21 fossil-species, which probably represent 17 biological species, were identified. Common species include Sigillaria brardii Brongniart, Lepidodendron dissitum Sauver, Annularia carinata Gutbier, Calamites undulatus Sternberg, Sphenophyllum oblongifolium (Germar and Kaulfuss) Unger, Acitheca polymorpha (Brongniart) Schimper and Nemejcopteris feminaeformis (Schlotheim) Barthel. Stratigraphically important are Sphenophyllum oblongifolium and Nemejcopteris feminaeformis, and based on their occurrence we can assume the studied paleoflora to be Gzhelian D (Jigulites jigulensis zone on the Russian Platform), i.e. Stephanian C</abstract>

Palaeontological Department, West Bohemian Museum in Pilsen, Kopeckého sady 2, 30100 Pilsen, Czech Republic

Geological Survey of Slovenia, Dimičeva ul. 14, 1000 Ljubljana, Slovenia

Department of Geology and Paleontology, Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic

Stephanian Fossil Flora from Paralic Carboniferous Deposits of the Jesenice Area (Slovenia) and Its Comparison with Czech Localities

<abstract><title style='display:none'>Abstract</title>Pennsylvanian fossil-fern cuticles are notoriously difficult to extract, little can be found in the palaeobotanical literature, yet they can supply significant taxonomic/systematic, phytostratigragphic, and palaeoenvironment information. This is demonstrated for cuticles from “Pecopteris” polypodioides of the coal basins in the Czech Republic and Canada. “Pecopteris” polypodioides is a marattialean tree fern which was part of the peat-forming flora, growing in a wet environment. Due to this fact, cuticles are generally very thin, and we assume that their major function was to reduce the ability of fungal spores to germinate and bacterial to grow, thereby reducing the possibility of these agents to cause disease. The secondary function was to be a major barrier to water loss and reducing the wettability of pinnules.</abstract>

Cuticles from Pennsylvanan Marattialean Fern <italic>“Pecopteris” Polypodioides</italic> (C. Presl in Sternberg) Němejc from Pilsen Basin (Czech Republic) and Sydney Coalfield (Canada)

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<title style='display:none'>Abstract</title>
Diminutive crinoid holdfasts and cemented tests of the foraminifers Psammosphaera and Tolypammina were observed on coarse bioclasts in weathered limestones of the Daleje-Třebotov Formation. Specimens were obtained in 1984 by washing so called “white beds” at a temporary locality in Praha- Barrandov. A few millimeter sized bioclasts with epibionts were freed from hard limestone beds of the Třebotov Limestone near the Lower/Middle Devonian boundary by long-term weathering. Many of the crinoid holdfasts attached to pluricolumnals provoked a stereomic response of the host crinoid. Also the growth orientation of the crinoid epibiont is not random and indicates some crinoid-epibiont to crinoidhost interaction. Reaction of host stereome and non-random stem orientation offer direct evidence of epibiont larval settlement and subsequent growth on the stem of a living crinoid host. The extensive growth of the host stereome ended by partial to total engulfing of the epibiont holdfast. This indicates advancing and finally successful defence of the host crinoid against the epibiont. The holdfast gives evidence that the small host crinoids offered a somewhat higher tier for even smaller epibiont crinoids. However, other observed holdfasts indicate fixation of larva and growth over loose bioclasts lying on a sea bed. Location of foraminifer test on bioclasts confims that foraminifers cemented and grew on loose echinodermal and brachiopod remains and preferred crevices and similar protected sites with concave profiles. This is clear evidence that diverse bioclasts (brachiopod shells, pelmatozoan ossicles) provided the hard substrate suitable for epibiont life on a sea bed.
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Diminutive Epibionts on Crinoid Stems from the Lower/Middle Devonian Boundary in the Barrandian, Czech Republic

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<title style='display:none'>Abstract</title>
Reported are descriptions of twelve samples representing a variety of sideritic structures, including nodules mostly from roof shale of the Middle Pennsylvanian Sydney Coalfield, Canada. The co-occurrence of fossiliferous nodules and compression fossils in the shaley roof rocks at Point Aconi enhance greatly palaeontological information. Newly discovered in a coal seam, and part of the sample, is a 40 mm thick continuous sheet-like layer of siderite with abundant permineralized-like-compressed small to micron-sized structures in a rather evenly-sized sideritic matrix, probably indicating a genetic origin different from that of the nodules. Methods include some thin-section, and two X-Ray analysis. However, large systematic sampling is a prerequisite to explore that situation, which additionally could provide faunal information for Euromerican correlation.
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Seminal Insights Concerning the Variety of Sidertic Structures and Variable Genesis and of Sideritic Occurrences: An Unexplored Source of Palaeontological Information (Sydney Coalfield, Middle Pennsylvanian, Canada)

<abstract>
<title style='display:none'>Abstract</title>
The earliest known Cyrtina in the Prague Basin has been discovered in the Kotýs Limestone of the Lochkov Formation (Lochkovian) among a rich brachiopod-coral fauna at Branžovy ridge near Bubovice (Beroun District, Czechia). Rare and imperfectly preserved silicified shells are assigned to Cyrtina praecedens Kozłovski, 1929, a species originally described from Podolia, Ukraine. The species is known also in north-eastern Russia (Tajmyr and Sette-Daban Mts) and likely also in New South Wales, Australia. Its distribution provides evidence of the rapid spread of Cyrtina across the shallow shelves of Laurussia, Siberia and Gondwana in the Early Devonian. The Devonian and Carboniferous distribution of Cyrtina is restricted to the agitated, shallow-water carbonate environment in tropical and temperate climatic belts.
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The Earliest <italic>Cyrtina</italic> (Brachiopoda, Cyrtinidina) in the Devonian of the Barrandian (Czech Republic)

<abstract>
<title style='display:none'>Abstract</title>
The construction of the new metro line D in Praha-Pankrác provides a unique opportunity to study different aspects such as lithology, stratigraphy and fossil assemblages from the Upper Ordovician and Silurian of the Prague Basin. Results from the sections in tunnels mined so far allowed detailed information about the succession of fossil assemblages, facies variability and actual thicknesses of the upper part of the Bohdalec Formation, the Králův Dvůr and Kosov formations in this part of Prague Basin. The stratigraphic position of Michle Facies in the Bohdalec Formation was also indicated.
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Construction of the Metro Line D in Praha-Pankrác: An Introductory Report About a Unique Opportunity for Study of the Upper Ordovician Fossil Assemblages and Sediments in the Prague Basin (Czech Republic)

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