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Tytuł:
Możliwości występowania gazu zamkniętego w piaskowcach środkowego kambru zachodniej części obniżenia bałtyckiego (wyniesienie Łeby) : wstępna analiza na podstawie danych petrofizycznych i geofizyki otworowej
Prospects of tight gas occurrence in the Middle Cambrian sandstones in the western part of the Baltic Depression (Łeba Elevation) : introductory analysis based on petrophysical and well logging data
Autorzy:
Adamczak-Biały, Teresa
Pacześna, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/2076067.pdf
Data publikacji:
2020
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
zamknięty gaz
piaskowce kambru środkowego
formacja Dębki
formacja białogórska
wyniesienie Łeby
parametry petrofizyczne
tight gas
Middle Cambrian sandstones
Dębki Formation
Białogóra Formation
Łeba Elevation
petrophysical parameters
Opis:
The main purpose of this article is an approximation of petrophysical parameters in selected borehole sections in the Łeba Elevation. The parameters are among the most important factors affecting the possibility of unconventional gas accumulation. The other factors explaining the possibility of tight gas accumulations in the Middle Cambrian sandstones of the Łeba Elevation are hydrocarbon shows in cores and drilling mud and the presence of conventional hydrocarbon fields. The potential hydrocarbon resources are related to the Dębki and Białogóra Formations. They are composed of fine-grained sandstones. The thickness of the Dębki Formation ranges up to 100 m. The tickness of the Białogóra Formation does not exceed 10 m. The analysis of petrophysical parameters of these formations indicates that their tight gas saturation has a layered character. The Dębki Formation shows a better potential for tight gas accumulation.
Źródło:
Przegląd Geologiczny; 2020, 68, 9; 701--709
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phosphatised olenid trilobites and associated fauna from the Upper Cambrian of Vastergotland, Sweden
Autorzy:
Ahlberg, P
Szaniawski, H.
Clarkson, E.N.K.
Bengtson, S.
Powiązania:
https://bibliotekanauki.pl/articles/19975.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
trilobite
Trilobita
Vastergotland
Olenidae
Sweden
Upper Cambrian
Cambrian
phosphatization
paleontology
Opis:
Secondarily phosphatised olenid trilobites from organic−rich limestones (orsten) in the Furongian (Upper Cambrian) of Västergötland, south−central Sweden, are described and illustrated. All trilobites originate from the Peltura scarabaeoides Zone and were collected on the western slope of Kinnekulle. Only the dorsal exoskeletons have become secondarily phosphatised, and the ventral appendages are not preserved. Yet the material is otherwise remarkably well preserved and reveals the morphology of the olenid trilobites in greater detail than hitherto known. Species belonging to the genera Ctenopyge, Sphaerophthalmus, Parabolina, and Peltura are identified, and several juvenile specimens are present in the material. The material is disarticulated and fragmentary, and it has only been possible to identify a few specimens to species level. In addition to chaetognaths and conodonts, the trilobites are associated with pelmatozoan columnals, a possible camaroid, and fossils of uncertain affinities. These fossils, along with a probable conulariid fragment from the Peltura minor Zone, are also described and discussed. The presence of a benthic fauna of pelmatozoans, and possible conulariids and camaroids, indicates that at least parts of the Peltura zones were deposited during dysoxic rather than anoxic periods. Moreover, the sea floor must have been firm enough to allow colonisation by sessile organisms.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Cambrian acritarch Lusatia: Taxonomy, palaeogeography, and biostratigraphic implications
Autorzy:
Albani, R.
Bagnoli, G.
Ribecai, C.
Raevskaya, E.
Powiązania:
https://bibliotekanauki.pl/articles/21158.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Acritarcha
Cambrian
Furongian
Late Cambrian
Lusatia
acritarch
biostratigraphy
marine phytoplankton
paleogeography
paleontology
taxonomy
phytoplankton
systematics
distribution
Opis:
Intraspecific variability of the herein emended diacrodian acritarch Lusatia dendroidea is described based on late Cambrian (Furongian) well preserved material from Spain, the High Arctic of Russia, and the East−European Platform. L. dendroidea, displays bipolar asymmetric morphology and, as originally defined, consists of three long major processes originating from the “corners” of its vesicle. Specimens with one, two and four major processes are considered to represent morphological variations of the most common three process form. Based on its narrow stratigraphic range, widespread palaeogeographic distribution, and distinctive morphology, L. dendroidea is an excellent guide fossil for the Furongian.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A middle Cambrian (Series 3, Stage 5) microfaunal assemblage from the Torgau-Doberlug Syncline (Central Germany) and its palaeogeographic implications for the configuration of West Gondwana
Autorzy:
Atnisha, Abubaker
Powiązania:
https://bibliotekanauki.pl/articles/138818.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
small shelly fossils
Cambrian
Torgau-Doberlug Syncline
Germany
West Gondwana
drobna fauna skorupkowa
małe skamieniałości skorupkowe
kambr
Niemcy
Gondwana
Opis:
A microfauna of small shelly fossils (SSF) is reported here for the first time from middle Cambrian (Series 3, Stage 5) subsurface strata of the Torgau-Doberlug Syncline (TDS), Central Germany. Considering that this microfauna is strongly limited and poorly preserved the material is quite abundant and diverse. The assemblage consists of molluscs (pelagiellids, bivalves), coeloscleritophorans (chancelloriids, halkieriids), poriferids, protoconodonts, cambroclaves, hyoliths, brachiopods, and disarticulated echinoderm remains. Additionally, a probable pterobranch hemichordate is noted. The assemblage is dominated by epifaunal suspension feeders from mid- to outer shelf depositional settings. Stratigraphically it represents (together with rare trilobites) the oldest middle Cambrian (Series 3, Stage 5) fauna known from Central Germany and the entire Saxothuringian Zone. Regardless the taphonomic problems related to the SSF occurrence, close palaeobiogeographic relations are indicated with the Mediterranean shelf of West Gondwana (especially with the areas of southwestern Europe and Morocco). The reported microfauna coupled with recent trilobite and palynomorph research supports assumptions that the Cambrian succession in the TDS is by far more complete than hitherto suggested, emphasizing its importance as a region yielding Cambrian rocks in Central Europe.
Źródło:
Acta Geologica Polonica; 2019, 69, 1; 1-25
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early Cambrian 'soft-shelled' brachiopods as possible stem-group phoronids
Autorzy:
Balthasar, U
Butterfield, N.J.
Powiązania:
https://bibliotekanauki.pl/articles/21500.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
Early Cambrian
brachiopod
soft-shelled brachiopod
phoronid
Brachiopoda
Phoronida
Lophophorata
Lophotrochozoa
Lingulosacculus nuda
Mural Formation
preservation
Opis:
Brachiopods and phoronids are widely recognised as closely related lophophorate phyla, but the lack of morphological intermediates linking the bivalved bodyplan of brachiopods with tubular phoronids has frustrated precise phylogenetic placement. Here we describe Lingulosacculus nuda gen. et sp. nov., a new “soft−shelled” brachiopod from the Early Cambrian Mural Formation of western Alberta which provides a plausible candidate for a phoronid stem−group within (paraphyletic) Brachiopoda. In addition to its non−biomineralised shell, L. nuda had a ventral valve with an exceptionally long, pocket−like extension (pseudointerarea) that would have allowed the transformation of criss−crossing brachiopod−type musculature to the longitudinal arrangement typical of phoronids. “Soft−shelled” linguliform brachiopods have previously been reported from both the Chengjiang and Burgess Shale Lagerstätten which, together with L. nuda, probably represent two independent losses of shell mineralisation in brachiopods.
Źródło:
Acta Palaeontologica Polonica; 2009, 54, 2; 307-314
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The integument of Cambrian chancelloriids
Autorzy:
Bengtson, S
Hou, X.
Powiązania:
https://bibliotekanauki.pl/articles/22108.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Coeloscleritophora
Allonnia
China
integument
body surface
enigmatic organism
sclerite
cactus spine
chancelloriid
Cambrian
paleontology
Lower Cambrian
Chancelloriidae
paleozoology
Opis:
Details of the body surface of the chancelloriid Allonnia from the Lower Cambrian Chengjiang biota in southwestern China elucidate the nature of these enigmatic organisms. Rhombically arranged elements, about 30 x 60 ym, are interpreted as representing imbricating platelets, the distal ends of which projected as spinules from the body surface. Comparisons with other chancelloriids suggest that the flexible integument was continuous with the aragonitic sclerites that sit on the surface like cactus spines, and that both were formed by an epidermal epithelium secreting a continuous exo- and endocuticle. In the sclerites, the exocuticle was mineralized; the unmineralized endocuticle and cellular extensions from the epithelium filled the interior of the sclerites. In the flexible integument the epithelium was overlain by endocuticle and unmineralized exocuticle. This structure of soft integument and sclerites is at variance with proposals of poriferan or ascidian affinity of chancelloriids but in accord with a coeloscleritophoran model.
Źródło:
Acta Palaeontologica Polonica; 2001, 46, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New reticulosan sponges from the middle Cambrian of Sonora, Mexico
Autorzy:
BERESI, MATILDE SYLVIA
BOTTING, JOSEPH P.
PALAFOX, JUAN J.
BUITRÓN SÁNCHEZ, BLANCA E.
Powiązania:
https://bibliotekanauki.pl/articles/945978.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
porifera
hexactinellida
reticulosa
burgess shale-type fauna
biogeography
cambrian
mexico
Opis:
A small assemblage of extremely well-preserved fragments of new sponges has been discovered in calcipelites of the middle Cambrian El Mogallón Formation in the Cerro El Mogallón section, near Arivechi in eastern Sonora, Mexico. The assemblage includes two new reticulosan species referred to Ratcliffespongia arivechensis sp. nov. and Valospongia sonorensis sp. nov., combined with disarticulated remains assigned to Kiwetinokia and additional, currently unidentifiable taxa. The new species represent the first records of these Cambrian genera from Mexico, although they are widely distributed at low latitudes, being previously best known from Utah but extending through Laurentia and South China. This middle Cambrian fauna indicates that there was considerable continuity of the deeper-water hexactinellid sponges between the warm peri-platform of Laurentia and the peri-continental Cambrian platform of Sonora. The new material supports the impression of extremely wide distribution of Cambrian sponge genera, with local diversification at species level within regions, in contrast to much greater generic-level endemism during the Ordovician Period.
Źródło:
Acta Palaeontologica Polonica; 2017, 62, 4; 691-703
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Caledonian basement in NW Wedel Jarlsberg Land south of Bellsund, Spitsbergen
Autorzy:
Birkenmajer, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2052058.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
Middle/Upper Proterozoic
Cambrian
Ordovician
Caledonian basement
lithostratigraphy
tectonics
Źródło:
Polish Polar Research; 2004, 25, 1; 3-26
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Jarlsbergian unconformity (Proterozoic/Cambrian boundary )and the problem of Varangian tillites in South Spitsbergen
Autorzy:
Birkenmajer, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2052817.pdf
Data publikacji:
1991
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
Late Proterozoic
Early Cambrian
unconformity
Źródło:
Polish Polar Research; 1991, 12, 3; 269-278
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An enigmatic, possibly chemosymbiotic, hexactinellid sponge from the early Cambrian of South China
Autorzy:
Botting, J.P.
Muir, L.A.
Li, X.-F.
Lin, J.-P.
Powiązania:
https://bibliotekanauki.pl/articles/19994.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Porifera
Hexactinellida
symbiosis
chemosynthesis
Early Cambrian
South China
Cambrian
China
Opis:
Six specimens of a strongly curved, cylindrical hexactinellid sponge have been recovered from the Tommotian– Atdabanian Hetang Biota of South China, and are described as Decumbispongia yuani gen. et sp. nov. The robust, thick−walled sponge shows no evidence of an osculum or basal structures, and the body form is inconsistent with an upright, filter−feeding life position. Interpretations as a detritivore feeding by amoeboid extensions, or as a facultative chemosynthetic symbiosis of sponge and bacteria are considered. The latter interpretation is preferred due to the highly constrained body shape, and the body form is interpreted from this perspective. The species indicates that Cambrian sponges occupied at least some autecological niches that appear to have been vacant since that time.
Źródło:
Acta Palaeontologica Polonica; 2013, 58, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New data on the anatomy of fuxianhuiid arthropod Guangweicaris spinatus from the lower Cambrian Guanshan Biota, Yunnan, China
Autorzy:
Chen, H.
Legg, D.A.
Zhai, D.-Y.
Liu, Y.
Hou, X.-G.
Powiązania:
https://bibliotekanauki.pl/articles/2082130.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Arthropoda
Euarthropoda
Fuxianhuiida
Fuxianhuiidae
Guanshan Biota
Cambrian
Asia
Opis:
The fuxianhuiid arthropod Guangweicaris spinatus, from the lower Cambrian (Series 2, Stage 4), Guanshan Biota (Wulongqing Member, Canglangpu Formation), located in the vicinity of Kunming (Yunnan Province, southwest China), is redescribed based on new specimens and a re-examination of previously described material. A more complete overview of its morphology is given. Newly recognised features include: (i) a medial cephalic bulge; (ii) a tripartite hypostome; (iii) a pair of specialized post-antennal appendage (SPA); (iv) a putative telson; (v) two pairs of spines on the posteroventral margin of the terminal abdominal segment. This information is used to provide an emended diagnosis of the family Fuxianhuiidae, and the genus Guangweicaris.
Źródło:
Acta Palaeontologica Polonica; 2020, 65, 1; 139-148
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skeletonized microfossils from the Lower-Middle Cambrian transition of the Cantabrian Mountains, Northern Spain
Autorzy:
Clausen, S
Alvaro, J.J.
Powiązania:
https://bibliotekanauki.pl/articles/21794.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
hyolith
cambroclavid
benthic replacement
microfossil
skeletonized microfossil
Spain
hyoliththelminth
sponge
chancelloriid
Cambrian
paleontology
Cantabrian Mountains
Lower-Middle Cambrian
Opis:
Two different assemblages of skeletonized microfossils are recorded in bioclastic shoals that cross the Lower–Middle Cambrian boundary in the Esla nappe, Cantabrian Mountains. The uppermost Lower Cambrian sedimentary rocks represent a ramp with ooid−bioclastic shoals that allowed development of protected archaeocyathan−microbial reefs. The shoals yield abundant debris of tube−shelled microfossils, such as hyoliths and hyolithelminths (Torellella), and trilobites. The overlying erosive unconformity marks the disappearance of archaeocyaths and the Iberian Lower–Middle Cambrian boundary. A different assemblage occurs in the overlying glauconitic limestone associated with development of widespread low−relief bioclastic shoals. Their lowermost part is rich in hyoliths, hexactinellid, and heteractinid sponge spicules (Eiffelia), chancelloriid sclerites (at least six form species of Allonnia, Archiasterella, and Chancelloria), cambroclaves (Parazhijinites), probable eoconchariids (Cantabria labyrinthica gen. et sp. nov.), sclerites of uncertain affinity (Holoplicatella margarita gen. et sp. nov.), echinoderm ossicles and trilobites. Although both bioclastic shoal complexes represent similar high−energy conditions, the unconformity at the Lower–Middle Cambrian boundary marks a drastic replacement of microfossil assemblages. This change may represent a real community replacement from hyolithelminth−phosphatic tubular shells to CES (chancelloriid−echinoderm−sponge) meadows. This replacement coincides with the immigration event based on trilobites previously reported across the boundary, although the partial information available from originally carbonate skeletons is also affected by taphonomic bias.
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Camenellan tommotiids from the Cambrian Series 2 of East Antarctica: Biostratigraphy, palaeobiogeography, and systematics
Autorzy:
Claybourn, T.M.
Skovsted, C.B.
Betts, M.J.
Holmer, L.E.
Bassett-Butt, L.
Brock, G.A.
Powiązania:
https://bibliotekanauki.pl/articles/2082288.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Tommotiida
Dailyatia
biostratigraphy
palaeobiogeography
Cambrian
Central Transantarctic Mountains
Opis:
Cambrian Series 2 shelly fossils from thick carbonate successions in East Antarctica have received limited systematic treatment through the 20th century. Described here are the East Antarctic camenellan tommotiids from the Shackleton Limestone in the Central Transantarctic Mountains and the Schneider Hills limestone in the Argentina Range. This material comes from both newly sampled collections and incompletely described material from older collections. The assemblage supports correlation to the Dailyatia odyssei Zone and Pararaia janeae Trilobite Zone of South Australia, with the newly examined specimens of Dailyatia decobruta from the Shackleton Limestone providing direct correlation to the Mernmerna Formation of the Ikara-Flinders Ranges and White Point Conglomerate of Kangaroo Island. These East Antarctic assemblages include five species referred to Dailyatia, in addition to an undetermined kennardiid species and fragments of the problematic Shetlandia multiplicata. The results further corroborate the notion that fossiliferous carbonate clasts found on King George Island were sourced from the same carbonate shelf as the Shackleton Limestone, with the taxon S. multiplicata found in both units. The Schneider Hills limestone in the Argentina Range has yielded sclerites of Dailyatia icari sp. nov., currently only known from this location.
Źródło:
Acta Palaeontologica Polonica; 2021, 66, 1; 207-229
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early Cambrian trace fossils at the northern margin of the Arabian Plate; Telbesmi Formation, Turkey
Autorzy:
Demírcan, H.
Gürsu, S.
Göncüoğlu, M. C.
Powiązania:
https://bibliotekanauki.pl/articles/138729.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ichnofossils
Telbesmi Formation
Early Cambrian
Derik (SE Turkey)
skamieniałość śladowa
formacja
wczesny kambr
Turcja
Opis:
The Telbesmi Formation, at the northern margin of the Arabian Plate, Turkey, is composed of alternating darkbrown, pinky-brown fluvial arkosic sandstone/mudstones with thin-bedded cherty limestones and channel conglomerates. The formation contains rare and poorly diversified trace fossils. The siltstone/sandstone beds of levels 1 and 2 of the formation yielded, however, a moderately diverse assemblage composed of: Cochlichnus isp., Palaeophycus isp., Planolites beverleyensis, Teichichnus isp. and ?Treptichnus rectangularis. This assemblage, made up of traces left by deposit feeding organisms, represents the Scoyenia ichnofacies. Treptichnus rectangularis and Palaeophycus isp., of the assemblage, can be considered markers for the base of the Cambrian in southeast Turkey.
Źródło:
Acta Geologica Polonica; 2018, 68, 2; 135-145
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bradoriid arthropods from the lower - middle Cambrian of Scania, Sweden
Autorzy:
Dies Alvarez, M.E.
Gozalo, R.
Cederstrom, P.
Ahlberg, P.
Powiązania:
https://bibliotekanauki.pl/articles/20703.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
bradoriid arthropod
arthropod
Cambrian
Scania
Sweden
paleontology
Arthropoda
Bradoriida
taxonomy
biostratigraphy
Opis:
Three species of bradoriid arthropods from the lower to middle Cambrian transitional interval of Scania, southern Sweden, are described and illustrated: Beyrichona tinea from the top of the traditional lower Cambrian (Gislöv Formation; Ornamentaspis? linnarssoni Zone), and Hipponicharion eos and Alutella sp. from the basal portion of the traditional middle Cambrian (lowermost part of the Alum Shale Formation). The bradoriid fauna compares most closely with others previously described from western and eastern Avalonia (New Brunswick and England). The record of B. tinea suggests a correlation between the “Protolenus Zone” (Hupeolenus Zone) of western Avalonia and the O.? linnarssoni Zone of Scandinavia. Hipponicharion eos appears to be a fairly long−ranging species as it has previously been recorded from upper lower Cambrian or lower middle Cambrian strata in New Brunswick, Poland, and probably Sardinia. The record of H. eos from the lowermost part of the Alum Shale Formation suggests that this largely unfossiliferous interval in the Scanian succession is not younger than the Acadoparadoxides oelandicus Superzone. The genus Alutella has not previously been recorded from the Acado−Baltic Province.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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