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Tytuł:
Crinoids from the Silurian of Western Estonia
Autorzy:
Ausich, W.I.
Wilson, M.A.
Vinn, O.
Powiązania:
https://bibliotekanauki.pl/articles/21031.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
crinoid
Silurian
Western Estonia
Estonia
Echinodermata
Crinoidea
Pridoli
paleontology
new species
Calceocrinus balticensis
Desmidocrinus laevigatus Eucalyptocrinites tumidus
Saaremaacrinus estoniensis
Opis:
The Silurian crinoids of Estonia are re−evaluated based on new collections and museum holdings. Nineteen species−level crinoid taxa are now recognized. All crinoid names applied to Estonian Silurian crinoids during the middle 19th century are disregarded. Especially significant is the fauna reported herein from the Pridoli because coeval crinoids are very poorly known from the Baltic region and elsewhere. One new genus and four new species are described from Estonia, namely Calceocrinus balticensis sp. nov., Desmidocrinus laevigatus sp. nov., Eucalyptocrinites tumidus sp. nov., and Saaremaacrinus estoniensis gen. et sp. nov.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The brachiopod succession through the Silurian–Devonian boundary beds at Dnistrove, Podolia, Ukraine
Autorzy:
Balinski, A.
Powiązania:
https://bibliotekanauki.pl/articles/23447.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
brachiopod
succession
Silurian
Devonian
boundary bed
Podolia
Ukraine
Brachiopoda
paleontology
paleoenvironment
Opis:
In the classic section across the Silurian–Devonian boundary at Dnistrove (Podolia, Ukraine) the brachiopod fauna has never been studied in detail. This paper presents results of research on brachiopods from this important locality and time interval. Bed−by−bed collecting has enabled the detailed distribution of brachiopod taxa through the boundary beds to be revealed. Generally, the reference section at Dnistrove yields rather scarce but often well preserved brachiopods. Dayia bohemica and Dnestrina gutta can be regarded as characteristic species for the uppermost Silurian. A relatively high−diversity but low−abundance brachiopod fauna occurs in the lowest 1.8 m of the earliest Devonian. Only three forms have been found to cross the Silurian–Devonian boundary: the strophomenide Plectodonta (Plectodonta) mariae pantherae subsp. nov., the atrypide Gracianella (Sublepida) paulula sp. nov., and the spiriferide Howellella (Howellella) latisinuata. A relatively narrow brachiopod−rich interval at 5.5 m above the Silurian–Devonian boundary yields 16 brachiopod species which probably indicate a setting near the lower limit of the photic zone equivalent to the Benthic Assemblage 3–4 boundary. Two new species and one new subspecies are described: Skenidioides tatyanae, Plectodonta (Plectodonta) mariae pantherae, and Gracianella (Sublepida) paulula.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Silurian retiolitid graptolite Plectograptus: New observations and new species
Autorzy:
Bates, D.E.B.
Kozlowska, A.
Maletz, J.
Kirk, N.H.
Lenz, A.
Powiązania:
https://bibliotekanauki.pl/articles/20525.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Graptoloidea
Plectograptus
Retiolitidae
rhabdosome
Silurian
graptolite
new species
paleontology
retiolitid graptolite
Ludlow
morphology
terminology
systematics
Opis:
The Ludlow genus Plectograptus, with the type species Retiolites macilentus Törnquist, 1887, collected from Thuringia (Germany), has been a widely−identified, monospecific, but poorly understood taxon for almost one hundred years. This was due to poor and incomplete preservation of the type material, and misidentification by subsequent authors up to 1995. The original, and only, type specimen of P. macilentus collected by Törnquist being lost, a neotype is herein selected from a small collection of Thuringian material. The genus has now been redefined and based on this, and SEM studies of isolated material, the defining characteristics of the genus are (i) the possession of a simple ancora umbrella with five radial lists with an incompletely developed rim; (ii) an ancora umbrella separated from lateral ancora sleeve walls by exceptionally large lateral orifices; (iii) the possession of mid−ventral lists; (iv) simple, orderly zigzag lateral wall ancora sleeve lists. Recently, two additional species, P. robustus and P. wimani, previously placed in different genera, were assigned to Plectograptus. This study recognizes three new species: P. mobergi, P. toernquisti, and P. trijunctus, bringing the total number of species to six. Species are distinguished by the presence or absence of genicular processes, inclination of the thecal ventral walls and mid−ventral lists, presence or absence of reticular lists, and three−way or four−way sleeve/lateral rod/apertural lip junctions.
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A giant boring in a Silurian stromatoporoid analysed by computer tomography
Autorzy:
Beuck, L
Wisshak, M.
Munnecke, A.
Freiwald, A.
Powiązania:
https://bibliotekanauki.pl/articles/20045.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Upper Visby Formation
computer tomography
Sweden
Densastroma pexisum
paleontology
Gotland Island
Silurian
stromatoporoid
trace fossil
Osprioneides kampto
analysis
Opis:
This study describes the largest known Palaeozoic boring trace, Osprioneides kampto igen. et isp. nov., found within a stromatoporoid Densastroma pexisum from the Upper Visby Formation (lower Wenlock, Silurian) on the island of Gotland, Sweden. Differences between the physical properties of the stromatoporoid and the dense micritic infilling of the borings allowed the application of the CT−scan technology for the 2D and 3D−visualisation of this rare trace. The additional application of a stereoscopic technique on these CT images and movies enhances its value for unravelling spatial orientations. This non−destructive method has a great potential for future macroas well as microboring analyses. The trace maker, most likely a worm, infested the hosting colony post−mortem with up to 120 mm long borings measuring 5–17 mm in diameter. Smaller forms of Trypanites and Palaeosabella within the same stromatoporoid preferentially occur in the outer coenosteum and occasionally in abandoned borings of O. kampto. The stratigraphic position of O. kampto follows the “Great Ordovician Biodiversification Event” in time, and reflects the increase in diversity of boring species. Borings with penetration depths of 120 mm are, however, unique findings for the Palaeozoic and were not exceeded until some 260 million years later (Bajocian, Middle Jurassic) when the “Mesozoic Marine Revolution” led to convergent reinventions as a result of enhanced predation, grazing pressure, and ecospace competition.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Cooksonia-type flora from the Upper Silurian of the Holy Cross Mountains, Poland
Autorzy:
Bodzioch, A
Kozlowski, W.
Poplawska, A.
Powiązania:
https://bibliotekanauki.pl/articles/20471.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
land plant
stratigraphy
Upper Silurian
Cooksonia
Polska
flora
vascular plant
Holy Cross Mountains
paleogeography
paleoenvironment
Opis:
Silurian land plants from the Holy Cross Mts. are described for the first time. The fossil assemblage occurs in a nearshore, marine, terrigenous deposit of Ludlowian/Pridolian age. It contains Cooksonia sp., Cooksonia−related species, and some problematical forms. The flora, which needs further study, is of importance to our understanding of early vascular plants and Late Silurian palaeogeography.
Źródło:
Acta Palaeontologica Polonica; 2003, 48, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concentrations of Silurian nautiloid cephalopods from Russia and Kazakhstan
Autorzy:
Bogolepova, O K
Holland, C H
Powiązania:
https://bibliotekanauki.pl/articles/22316.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Cephalopoda
cephalopod
Silurian
concentration
Russia
living population
Kazakhstan
paleontology
nautiloid cephalopod
Opis:
Silurian cephalopod limestones known from northern Asia are usually singular beds or horizons of nodules. They range in their taphonomic character from the Mojero river type, with postmortem concentration from rich living populations by relatively gentle bottom currents into a submarine low, to that of the Karabutak Formation of the South Urals, where there has been concentration by strong wave or current action.
Źródło:
Acta Palaeontologica Polonica; 1995, 40, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Facies transition and biostratigraphic correlation of the Upper Silurian and Lower Devonian in West Bulgaria
Autorzy:
Boncheva, I.
Sachanski, V.
Lakova, I.
Yaneva, M.
Powiązania:
https://bibliotekanauki.pl/articles/2059515.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Bulgaria
Upper Silurian-Lower Devonian
conodonts
graptolites
facies transition
Opis:
Upper Silurian and Lower Devonian shelf deposits in West Bulgaria are exposed in three main Alpine tectonic units: the West Balkan Unit, the Lyubash Monocline and the Morava Unit. The West Balkan and Lyubash units consist of siliciclastic deposits: black graptolitic shales, banded pale shales and black siltstones. The Ludlow, Pridoli, Lochkovian, Pragian and Emsian were recognized on the basis of graptolite and tentaculite faunas. In the Morava Unit, the Ludlow black shales are progressively replaced by clayey limestones and nodular and micritic limestones in the Pridoli and Early Devonian. Newly obtained conodonts show the presence of the siluricus, eosteinhornensis, woschmidti, postwoschmidti, delta-pesavis, sulcatus, dehiscens and gronbergi zones. Petrographic study of the Morava Unit shows an increasing carbonate content and shallowing conditions upwards. The biostratigraphical correlation and facies interpretation reveal the coeval existence of two different depositional environments within the same shelf basin as well as a gradual shift in proximal direction.
Źródło:
Geological Quarterly; 2007, 51, 4; 407-418
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Autorzy:
Buttler, C.J.
Cherns, L.
McCobb, L.M.E.
Powiązania:
https://bibliotekanauki.pl/articles/31341406.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
trepostome bryozoan
bryozoan
Silurian
gastropod
biodiversity
Gastropoda
Bryozoa
symbiosis
overgrowth
aragonite
taphonomy
Shropshire county
United Kingdom
Źródło:
Acta Palaeontologica Polonica; 2022, 67, 3; 569-577
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rola geofizyki wiertniczej w określeniu zasobów gazu ziemnego w łupkach
Application of wire log analysis for petrophysical evaluation and determination of shale gas reserves
Autorzy:
Drop, K.
Kozłowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2074763.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
gaz łupkowy
interpretacja geofizyki wiertniczej
łupki
shale gas
petrophysical interpretation
Silurian Shale
Opis:
The paper presents differences between conventional and shale gas plays (Tab. 1). Shale gas concept comprises a wide range of reservoirs, from the coalbed to tight gas plays. In Europe, where the shale gas rush has just started, shaly rocks were treated so far as unproductive and high quality data sets necessary for evaluating properties of those rocks are usually missing. Therefore, US shale gas plays like Barnett and Haynesville are widely used as valuable reference tools (Jacobi, 2008; Parker, 2009). Coal, where gas is essentially stored entirely by sorption, represents one end of the unconventional gas spectrum and tight gas sands, where gas is essentially stored by compression only - the other end of that spectrum. In turn, shale reservoirs with gas entrapped by sorption and compression, fill the space between the two endpoints. Differentiation of those two components is one of the primary goals of an analysis program. Shale gas reservoirs are formed by a wide variety of rock types which makes it necessary to use most appropriate technologies to characterize both coalbed and tight gas reservoirs. The current paper concentrates on tools for evaluating petrophysical parameters, most suitable for shale gas plays. In the case of old wells with old fashion Soviet logs, the uncompensated neutron gamma tool was commonly used tool. This was the only porosity reading curve in log suite, "neutron porosity curve" which could be overlaid with natural gamma ray (GR) (Fig. 1). Natural gamma ray curve is a good indicator of organic matter, which adsorbed uranium. Other hydrocarbon signatures can be traced on the basis of SP vs GR, GR vs resistivity. Some of hydrocarbon signatures can be related to TOC from core lab measurements. For contemporary good quality wire line log curves the Passey et al. (1990) method has been applied. This method is based on computation of separation between acoustic transit time and resistivity (R) (Fig. 2). The resulting difference is used to calculate TOC taking into consideration maturity of organic matter which is parameter for a bunch of relationships (TOC vs R). Local calibration R to TOC from cores are required. In order to determine reliable relationships between R, gas contents to TOC, the high technology coring service and sensitive laboratory measurements are necessary. The results of petrophysical analyses are important for estimations of gas resources in shales. The formulas for computation of conventional and unconventional gas reserves are generally similar. However, in the case of the unconventional gas reserves, instead of porosity reservoir storage the rock density is applied, and for determinations of hydrocarbon volume-the gas content is applied in place of hydrocarbon saturation. If European unconventional reservoirs turn to be profitable then continent landscape will also change. The big gas fields would require dense networks of rigs that will have some negative environmental impact. This would require a change in industry structure, as well as in public opinion and legal regulations.
Źródło:
Przegląd Geologiczny; 2010, 58, 3; 263-265
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Litofacje formacji perspektywicznych dla gazu i ropy w łupkach w utworach ordowiku i syluru na obszarze bałtyckim i podlasko-lubelskim
Lithofacies of the Ordovician and Silurian formations prospective for shale gas/oilin the Baltic and Podlasie-Lublin areas
Autorzy:
Feldman-Olszewska, A.
Roszkowska-Remin, J.
Powiązania:
https://bibliotekanauki.pl/articles/2075505.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
litofacje
ordowik
silurian
łupki
lithofacies
Ordovician
Silurian
shales
Opis:
The paper presents a sedimentological analysis of Ordovician (Sandbian–Hirnantian = Caradoc–Ashgill) and Silurian (Landovery–Wenlock, lower Ludlow) claystones and mudstones from the north-eastern (Baltic Basin) and south-eastern (Podlasie-Lublin Basin) parts of the East European Craton. In both basins, formations prospective for shale gas/oil were analyzed: the Sasino Fm., Pasłęk Fm. (including the Jantar Mb.), Pelplin Fm., Udal Fm., Wrotnów Fm. and Terespol Fm. Based on lithological and sedimentological criteria, 34 lithofacies and 11 lithofacies associations have been distinguished. The most promising lithofacies arerepresentedbytheL-1,L-3andL-4associationswhicharecharacterizedbydarkgreycolour, a very low degree or lack of bioturbation, rare sedimentary structures, and common content of small pyrite concretions. They dominate in the Sasino Fm., Pas³êk Fm. (in the Jantar Mb. only) and Pelplin Fm., but are much less common in the Udal Fm., Terespol Fm. and Pas³êk Fm. (excluding the Jantar Mb.).
Źródło:
Przegląd Geologiczny; 2016, 64, 12; 968--975
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Waloryzacja geostanowisk na obszarze projektowanego Geoparku Łysogórskiego w Górach Świętokrzyskich
Valorization of geosites in the projected Łysogóry Geopark in the Holy Cross Mountains
Autorzy:
Fijałkowska-Mader, A.
Malec, J.
Powiązania:
https://bibliotekanauki.pl/articles/2075050.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Cambrian
Silurian
Devonian
Cenozoic
geosite
geodiversity
geotourism
kambr
sylur
devon
kenozoik
geostanowisko
georóżnorodność
geoturystyka
Opis:
The paper presents results of valorization of geosites in the Łysogóry Region of the Holy Cross Mountains, which warrant creation of the Łysogóry Geopark. Numerous geosites of different Paleozoic rocks offer a great educational potential, combining many fields of knowledge, such as geology, geomorphology, paleontology, paleoecology, ancient metallurgy industry and historical monuments. Geodiveristy makes this area very attractive for geotourism.
Źródło:
Przegląd Geologiczny; 2013, 61, 3; 165--171
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka petrograficzna paleozoicznych skał łupkowych basenu bałtyckiego : konsekwencje dla rozpoznawania i wydobycia gazu łupkowego
Petrography of palaeozoic shale from Baltic basin : implications for recognition and exploitation of shale gas
Autorzy:
Gąsiński, A.
Poszytek, A.
Powiązania:
https://bibliotekanauki.pl/articles/394923.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
łupki sylursko-ordowickie
gaz łupkowy
porowatość
mineralogia
Silurian-Ordovician shale
shale gas
porosity
mineralogy
Opis:
W pracy zaprezentowano wyniki szczegółowych badań mineralogicznych, które wraz z obserwacjami w wysokorozdzielczym mikroskopie skaningowym dostarczyły informacji na temat składu mineralnego, tekstur i charakteru wykształcenia porowatości w ordowicko-sylurskich skałach łupkowych basenu bałtyckiego. Głównymi składnikami tych skał są minerały ilaste oraz kwarc, kalcyt, dolomit, piryt i skalenie. Znaczna część kwarcu ma charakter diagenetyczny, co korzystnie wpływa na możliwości szczelinowania skał. Na podstawie uzyskanych wyników opisano także procesy, które w zasadniczy sposób wpłynęły na formowanie obecnie występującej porowatości. Stwierdzono, że najważniejszym procesem mającym wpływ na powstanie wtórnej porowatości było przeobrażanie minerałów ilastych (smektyt-illit), a współwystępująca wraz z tym procesem cementacja krzemionką spowodowała prawie całkowite wypełnienie powstałej przestrzeni porowej. Prawdopodobnie pory były wypełniane również przez autogeniczne ziarna chlorytów. Pory zachowane w badanych skałach łupkowych podzielono na cztery typy, biorąc pod uwagę morfologię i charakter ich występowania. Stwierdzono potencjalną możliwość występowania drobnych połączeń pomiędzy porami, co może pozwalać na powolną migrację mediów w skale.
The paper presents the results of detailed mineralogical studies of shales in Ordovician-Silurian Baltic basin. Main constituents of these rocks are clay minerals (illite and smectite), quartz, calcite, dolomite, pyrite and feldspars. Significant part of quarz grains is of authigenic origin, which positively influences the process of hydraulic fracturing. Observations in the high-resolution scanning electron microscope gave information about the nature of porosity in the shale and the processes which significantly contributed to the formation of porosity. It was found that the most important process affecting the secondary porosity of shale was the transformation of clay minerals (smectite-illite). Created pore space was almost completely filled by silica cement. Preserved pores were divided into four types according to their morphology and nature of occurrence. There was also found the potential for occurrence of interconnections between fine pores that allow fluid migration.
Źródło:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2013, 85; 79-88
2080-0819
Pojawia się w:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phanerozoic paleoenvironment and paleolithofacies maps : Early Paleozoic
Mapy paleośrodowiska i paleolitofacji fanerozoiku : wczesny paleozoik
Autorzy:
Golonka, J.
Powiązania:
https://bibliotekanauki.pl/articles/183797.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
paleogeografia
kambr
ordowik
sylur
tektonika płyt litosfery
Cambrian
Ordovician
Silurian
plate tectonics
paleogeography
Opis:
The paper presents the detailed plate tectonic, paleogeographic, paleoenvironment and plaeolithofacies maps for eight Early Paleozoic time intervals. Forty maps, generated using PLATES and PALEOMAP programs, contain information about plate tectonics, paleoenvironment, and plaeolithofacies during Cambrian, Ordovician and Silurian. Disintegration of supercontinent Pannotia and origin of Gondwana, Laurentia and Baltica occur during Early Cambrian. Oceans spreading continued during Late Cambrian and Early Ordovician; vast platform flooded by shallow seas existed on the continents. The plate tectonic reorganization happened during Middle Ordovician. Silurian was a time of Caledonian orogeny, closing of Early Paleozoic oceans and origin of supercontinent Laurussia as a result of Laurentia and Baltica collision. Information contained within global and regional papers were posted on the maps and the detailed paleoenvironment and plaeolithofacies zones were distinguished within the platforms, basins and ridges.
Artykuł przedstawia szczegółowe mapy paleogeograficzne dla ośmiu przedziałów czasowych w obrębie wczesnego paleozoiku. Czterdzieści map, skonstruowanych przy użyciu programów PLATES i PALEOMAP, zawiera informacje dotyczące tektoniki płyt, paleośrodowiska i paleolitofacji w czasie kambru, ordowiku i syluru. We wczesnym kambrze nastąpił rozpad superkontynentu Pannotia i utworzyły się kontynenty: Gondwana, Laurencja, Bałtyka i Syberia. W późnym kambrze i wczesnym ordowiku w dalszym ciągu ma miejsce spreding oceanów, istnieją też w tym czasie rozległe platformy zalane przez płytkie morza na kontynentach. Reorganizacja płyt litosfery nastąpiła w środkowym ordowiku. Sylur był okresem orogenezy kaledońskiej, zamknięciem wczesno- paleozoicznych oceanów i powstania superkontynentu Laurosji z połączenia Laurencji i Bałtyki. Informacje zawarte w szeregu globalnych i regionalnych prac zostały naniesione na mapy, a w obrębie platform, basenów i grzbietów wydzielono poszczególne strefy paleośrodowiskowe i paleolitofacjalne
Źródło:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2009, 35, 4; 589-654
0138-0974
Pojawia się w:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silurian stratigraphy of Central Iran - an update
Autorzy:
Hairapetian, V.
Ghobadi Pour, M.
Popov, L. E.
Männik, P.
Miller, C. G.
Powiązania:
https://bibliotekanauki.pl/articles/139183.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Iran
Silurian
biostratigraphy
lithostratigraphy
sedimentology
correlation
sylur
biostratygrafia
litostratygrafia
sedymentologia
korelacja
Opis:
The Silurian biostratigraphy, lithostratigraphy, and facies of Central Iran including the Kashmar (Boghu Mountains), Tabas (Derenjal Mountains, Ozbak-Kuh), Anarak (Pol-e Khavand) and Kerman regions is reviewed and updated. The current state of knowledge of the Silurian in the Zagros Basin, Alborz, Kopet-Dagh and Talysh regions, as well as in a few areas scattered across the Sabzevar Zone, and the Sanandaj-Sirjan terranes is also reviewed. Silurian volcanism in various parts of Iran is briefly discussed. The end of the Ordovician coincided with a widespread regression across Iran synchronous with the Hirnantian glaciation, and only in the Zagros Basin is there a continuous Ordovician–Silurian transition represented by graptolitic black shales of the Sarchahan Formation. In the Central-East Iranian Platform marine sedimentation re-commenced in the early to mid Aeronian. By the Sheinwoodian, carbonate platform depositional environments were established along its north-eastern margin. In other parts of Iran (e.g., Kopet-Dagh and the Sabzevar Zone), siliciclastic sedimentation continued probably into the late Silurian. The Silurian conodont and brachiopod biostratigraphy of Central Iran is significantly updated facilitating a precise correlation with the Standard Global Chronostratigraphic Scale, as well as with key Silurian sections in other parts of Iran. The Silurian lithostratigraphy is considerably revised and two new lithostratigraphical units, namely the Boghu and Dahaneh-Kalut formations, are introduced.
Źródło:
Acta Geologica Polonica; 2017, 67, 2; 201-233
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silurian thelodonts from the Niur Formation, central Iran
Autorzy:
Hairapetian, V
Blom, H.
Miller, C.G.
Powiązania:
https://bibliotekanauki.pl/articles/20388.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
thelodont
Loganelliiformes
paleontology
Silurian
Phlebolepidiformes
paleobiogeography
Thelodonti
Niur Formation
Iran
Opis:
Thelodont scales are described from the Silurian Niur Formation in the Derenjal Mountains, east central Iran. The material studied herein comes from four stratigraphic levels, composed of rocks formed in a shallow water, carbonate ramp environment. The fauna includes a new phlebolepidiform, Niurolepis susanae gen. et sp. nov. of late Wenlock/?early Ludlow age and a late Ludlow loganelliiform, Loganellia sp. cf. L. grossi, which constitute the first record of these thelodont groups from Gondwana. The phlebolepidiform Niurolepis susanae gen. et sp. nov. is diagnosed by having trident trunk scales with a raised medial crown area separated by two narrow spiny wings from the lateral crown areas; a katoporodidtype histological structure distinguished by a network of branched wide dentine canals. Other scales with a notch on a smooth rhomboidal crown and postero−laterally down−stepped lateral rims have many characters in common with Loganellia grossi. Associated with the thelodonts are indeterminable acanthodian scales and a possible dentigerous jaw bone fragment. This finding also provides evidence of a hitherto unknown southward dispersal of Loganellia to the shelves of peri−Gondwana.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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