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    Wyświetlanie 1-11 z 11
    Tytuł:
    Cambrian microfossils from glacial erratics of King George Island, Antarctica
    Autorzy:
    Wrona, R
    Powiązania:
    https://bibliotekanauki.pl/articles/22565.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    skeletal fossil
    Antarctic
    Australia
    Middle Cambrian
    Early Cambrian
    microfossil
    Cape Melville Formation
    Cambrian
    paleontology
    Early Miocene
    King George Island
    Opis:
    Limestone erratics in the Early Miocene glacio−marine Cape Melville Formation of King George Island, West Antarctica, have yielded Early and Middle Cambrian small skeletal fossils (SSF) accompanied by calcified cyanobacteria, archaeocyath and spiculate sponges, trilobites and echinoderms. The SSF assemblage comprises disarticulated sclerites of chancelloriids, halkieriids, tommotiids, lapworthellids, palaeoscolecids, hyolithelminths, lingulate brachiopods, helcionelloid molluscs, hyoliths, and bradoriids. All 24 described species are common to Antarctica and Australia. Most are recorded here from Antarctica for the first time, including Shetlandia multiplicata gen. et sp. nov. and two new species Byronia? bifida and Hadimopanella staurata. The lithological and fossil contents of the boulders are almost identical with autochthonous assemblages from the Shackleton Limestone in the Argentina Range and Transantarctic Mountains. Cambrian outcrops around the Weddell Sea are a plausible source of the erratics. The fauna is closely similar to that from the uppermost Botomian Wilkawillina Limestone in the Flinders Ranges and Parara Limestone on Yorke Peninsula, and Toyonian Wirrealpa and Aroona Creek Limestones in the Flinders Ranges, as well as the Ramsay Limestone on Yorke Peninsula, all in the Arrowie and Stansbury Basins of South Australia. These very similar faunal and facies successions for Antarctica and Australia strongly support their common biotic and sedimentary evolution on the same margin of a greater Gondwana supercontinent throughout the Early Cambrian.
    Źródło:
    Acta Palaeontologica Polonica; 2004, 49, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Burgess Shale-type microfossils from the middle Cambrian Kaili Formation, Guizhou Province, China
    Autorzy:
    Harvey, T.H.P.
    Ortega-Hernandez, J.
    Lin, J.-P.
    Yuanlong, Z.
    Butterfield, N.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/23425.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    microfossil
    Middle Cambrian
    Cambrian
    Kaili Formation
    Guizhou province
    China
    Priapulida
    acritarch
    palynology
    taphonomy
    Opis:
    Diverse carbonaceous microfossils, including exceptionally preserved remains of non−biomineralizing metazoans, are reported from a basal middle Cambrian interval of the Kaili Formation (Guizhou Province, China). The application of a gentle acid maceration technique complements previous palynological studies by revealing a larger size−class of acritarchs, a richer assemblage of filamentous microfossils, and a variety of previously unrecovered forms. Metazoan fossils include Wiwaxia sclerites and elements derived from biomineralizing taxa, including chancelloriids, brachiopods and hyolithids, in common with previously studied assemblages from the early and middle Cambrian of Canada. In addition, the Kaili Formation has yielded pterobranch remains and an assemblage of cuticle fragments representing “soft−bodied” worms, including a priapulid−like scalidophoran. Our results demonstrate the wide distribution and palaeobiological importance of microscopic “Burgess Shale−type” fossils, and provide insights into the limitations and potential of this largely untapped preservational mode.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soft-part preservation in two species of the arthropod Isoxys from the middle Cambrian Burgess Shale of British Columbia, Canada
    Autorzy:
    Garcia-Bellido, D.C.
    Vannier, J.
    Collins, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/20887.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    arthropod
    Isoxys
    Middle Cambrian
    Cambrian
    Burgess Shale
    British Columbia
    Canada
    Arthropoda
    Isoxys acutangulus
    Isoxys longissimus
    paleontology
    fossil
    Opis:
    More than forty specimens from the middle Cambrian Burgess Shale reveal the detailed anatomy of Isoxys, a worldwide distributed bivalved arthropod represented here by two species, namely Isoxys acutangulus and Isoxys longissimus. I. acutangulus had a non−mineralized headshield with lateral pleural folds (= “valves” of previous authors) that covered the animal’s body almost entirely, large frontal spherical eyes and a pair of uniramous prehensile appendages bearing stout spiny outgrowths along their anterior margins. The 13 following appendages had a uniform biramous design—i.e., a short endopod and a paddle−like exopod fringed with marginal setae with a probable natatory function. The trunk ended with a flap−like telson that protruded beyond the posterior margin of the headshield. The gut of I. acutangulus was tube−like, running from mouth to telson, and was flanked with numerous 3D−preserved bulbous, paired features interpreted as digestive glands. The appendage design of I. acutangulus indicates that the animal was a swimmer and a visual predator living off−bottom. The general anatomy of Isoxys longissimus was similar to that of I. acutangulus although less information is available on the exact shape of its appendages and visual organs. I. longissimus is characterized by extremely long anterior and posterior spines. There are now seven Isoxys species known with soft−part preservation, I. acutangulus, I. longissimus from the Burgess Shale, I. auritus and I. curvirostratus from the Maotianshan Shale of China, I. communis and I. glaessneri from the Emu Bay Shale of Australia and I. volucrisfrom Sirius Passet in Greenland. The frontal appendages of Isoxys strongly resemble those of other Cambrian arthropods, characterized by a single pair of “great appendages” with a shared prehensile function yet some variability in length and shape.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fossil chaetognaths from the Burgess Shale: A reply to Conway Morris [2009]
    Autorzy:
    Szaniawski, H
    Powiązania:
    https://bibliotekanauki.pl/articles/21244.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    chaetognath
    fossil
    new genus
    new species
    Middle Cambrian
    Chaetognatha
    Oesia disjuncta
    polychaete annelid
    Cambrian
    Amiskwia sagittiformis
    Opis:
    Walcott (1911) erected the new genus and species Oesia disjuncta and assigned them to the polychaete annelids, based on a small collection of similar fossils from the famous Middle Cambrian Burgess Shale. In 2002 I suggested that the species is “possibly related to chaetognaths” (Szaniawski 2002: 405). Later, after obtaining new photos of the specimens and making comparative investigations with the extant chaetognaths, I was able to describe many significant similarities, and came to the conclusion that O. disjuncta indeed is an ancestral chaetognath (Szaniawski 2005). This interpretation already has been accepted in several publications (Vannier et al. 2005; Ball and Miller 2006; Hu et al. 2007. Giribet 2008). Ball and Miller (2006: 594) confirmed not only its “... remarkable resemblance to modern chaetognaths” but also correctness of recognition of all its organs. They even reproduced a part of my illustration showing them (Ball and Miller 2006: fig. 2). Vannier et al. (2006: 629) combined the problem with the open question of the systematic position of another Burgess Shale fossil Amiskwia sagittiformis Walcott, 1911, and expressed their reservation based on “...the lack of clear evidence of a grasping apparatus...”. Only Conway Morris (2009) firmly disagreed with this diagnosis and even devoted a special “discussion” article addressing the issue. However, that article contains several ambiguities and misunderstandings which need clarification.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 2; 361-364
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Middle Cambrian gogiid echinoderms from Northeast Spain: Taxonomy, palaeoecology, and palaeogeographic implications
    Autorzy:
    Zamora, S
    Gozalo, R.
    Linan, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/21902.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    Middle Cambrian
    gogiid echinoderm
    Spain
    taxonomy
    paleoecology
    paleogeography
    Gogia parsleyi
    echinoderm assemblage
    Echinodermata
    Murero Formation
    Eocrinoidea
    Gogia
    Gogiida
    Opis:
    Gogia parsleyi Zamora sp. nov. and Gogia sp. are described from two different echinoderm assemblages, both from the middle Cambrian of the Murero Formation (Iberian Chains, NE Spain). Gogia parsleyi is reconstructed and described on the basis of fifteen complete or partial specimens and numerous isolated plates. It is characterised by spiralled brachioles, simple epispires, sometimes covered by stereomic domes or tiny cover plates, and by thecal plates arranged in subregular circlets. This gogiid population comprises juveniles, advanced juveniles and mature individuals. The material was found in the upper part of the Murero Formation (upper Caesaraugustian–lower Languedocian). Gogia sp. is represented by two almost complete specimens and several isolated plates from the lower part of the Murero Formation (lower Caesaraugustian). The genus Gogia was first described in Western Gondwana from the Languedocian (upper middle Cambrian) of France, but the material from Spain is older and represents the oldest record of this genus in Gondwana, suggesting an early migration from Laurentia. The gogiids are well preserved in two echinoderm Lagerstätten, which, together with other echinoderms, comprise the majority of the fossil fauna. Both levels are derived from obrution deposits produced in calm and open marine conditions, sometimes affected by sporadic storms. Their holdfast morphology suggests that these gogiids were low−tier suspension feeders, living attached to trilobite fragments in a soft, muddy environment.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 2; 253-265
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new Middle Cambrian stem-group echinoderm from Spain: Palaeobiological implications of a highly asymmetric cinctan
    Autorzy:
    Zamora, S
    Smith, A.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/22838.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleobiology
    new species
    Homostelea
    Spain
    paleontology
    Echinodermata
    functional morphology
    asymmetric body
    Middle Cambrian
    echinoderm
    Lignanicystis barriosensis
    carpoid
    Opis:
    A new exquisitely preserved stem group echinoderm (cinctan), Lignanicystis barriosensis gen. et sp. nov., is described from the Middle Cambrian of Los Barrios de Luna, North Spain. This displays a unique asymmetrical body plan with ventral projecting nodes that raised the lower surface above the substratum. There are four openings through the body wall: mouth, anus, atrium, and an aligned row of sutural pores of uncertain function. Unlike other cinctans, Lignanicystis has a strongly asymmetrical shape convergent with that of some cornute carpoids. Like cornutes, the test is also elevated above the substratum to allow water flow beneath the theca. In both cases this is probably an adaptation to life in higher water flow regimes.
    Źródło:
    Acta Palaeontologica Polonica; 2008, 53, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slope failure on a Cambrian carbonate platform, mass-flow transitions and resulting complex deposit
    Autorzy:
    Wang, Zhaopeng
    Liu, Jiaye
    Van Loon, A. J. (Tom)
    Zhu, Decheng
    Qin, Peng
    Han, Zuozhen
    Powiązania:
    https://bibliotekanauki.pl/articles/2058558.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Gushan Formation
    Middle Cambrian
    epeiric sea
    carbonate platform
    mass-flow transitions
    Opis:
    The quiet environment of the carbonate platform in the epeiric sea that existed during the Cambrian between present-day China and Korea was occasionally affected by processes that have hitherto not been described from such a setting. A conglomerate was found in the Middle Cambrian Gushan Formation near Chengouwan (Shandong Province, E China), eroded into the underlying sediments. The conglomerate is explained as a deposit consisting of material that was eroded up-slope when slope-failure took place, resulting in a slump that passed into a high-density debris flow with erosive power that passed, in turn, again into a slump. The slump came to rest when it lost its momentum on a less inclined part of the basin slope. Immediately after deposition, fluidization occurred in the lower part of the slump deposit, as proven by a funnel-shaped water-escape structure and a lateral injection of some metres long of brecciated material.
    Źródło:
    Geological Quarterly; 2020, 64, 1; 3--15
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wysokorozdzielcza stratygrafia sekwencji utworów środkowego kambru w południowej i północno-wschodniej części bloku B (wyniesienie Łeby)
    High-resolution sequence stratigraphy of the Middle Cambrian deposits from the southern and northeastern part of Block B (Łeba Elevation)
    Autorzy:
    Pacześna, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2062895.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    parasekwencje
    korelacja chronostratygraficzna
    środkowy kambr
    blok B
    wyniesienie Łeby
    parasequences
    chronostratigraphic correlation
    Middle Cambrian
    Block B
    Łeba Elevation
    Opis:
    Przedmiotem artykułu jest wysokorozdzielcza stratygrafia sekwencji środkowokambryjskich utworów południowej i północno-wschodniej części bloku B (wyniesienie Łeby). Zdefiniowane parasekwencje formują ciąg systemowy wysokiego stanu względnego poziomu morza o zróżnicowanej regionalnie budowie. Facjalne przekroje prostopadłe i równoległe do rozciągłości paleolinii brzegowej umożliwiły chronostratygraficzną korelację skał zbiornikowych dla węglowodorów w regionalnej skali basenu sedymentacyjnego.
    The main subject of article is a high-resolution sequence stratigraphy of the Middle Cambrian deposits of southern and northeastern part of the Block B (Łeba Elevation). Distinguished parasequences form a highstand systems tract of the relative sea level with regionally differentiated stacking patterns. Facies sections, perpendicular and parallel to paleoshoreline made possible a correlation of the hydrocarbons reservoir rocks on the basinwide scale.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2012, 448 (1); 71--79
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Burges Shale animal Oesia is not a chaetognath: A reply to Szaniawski [2005]
    Autorzy:
    Morris, S C
    Powiązania:
    https://bibliotekanauki.pl/articles/21841.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    discussion
    paleontology
    Middle Cambrian
    Burges Shale
    Oesia disjuncta
    chaetognath
    Opis:
    The Middle Cambrian Oesia disjuncta, a monospecific genus, is known only from the celebrated Burgess Shale of British Columbia. It has been re−interpreted by Szaniawski (Acta Palaeontologica Polonica 50:1–8; 2005) as a chaetognath, a distinctive phylum whose exact position in the protostomes is still controversial. Unequivocal chaetognaths, that have no similarity to Oesia, are already known to occur in the Chengjiang Lagerstätte (Lower Cambrian, S.W. China), and here I describe the first example of a chaetognath from the Burgess Shale itself. Comparisons between Oesia and chaetognaths fail to find any significant homologies. Whilst the phyletic position of Oesia is very uncertain, a place in the hemichordates may be worth exploring.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 1; 175-179
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rugosa and Scleractinia - a commentary on some methods of phylogenetic reconstructions
    Autorzy:
    Fedorowski, J
    Powiązania:
    https://bibliotekanauki.pl/articles/21231.pdf
    Data publikacji:
    1997
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Rugosa
    similarity
    Scleractinia
    Calceola sandalina
    Cothonion sympomatum
    morphology
    external wall
    mineralogy
    stratigraphy
    Middle Cambrian
    evolution
    paleontology
    calice rim
    Opis:
    The origin of the Rugosa and relationships between the Rugosa and Scleractinia are debated. In the present account I comment on some recently published phylogenetic reconstructions, which in my opinion, are based on inadequate data.
    Źródło:
    Acta Palaeontologica Polonica; 1997, 42, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The stem crustacean Oelandocaris oelandica re-visited
    Autorzy:
    Stein, M
    Waloszek, D.
    Maas, A.
    Haug, J.T.
    Muller, K.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/22166.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    morphology
    stem lineage
    Crustacea
    paleontology
    arthropod
    computer-aided 3D modelling
    Middle Cambrian
    phylogenesis
    evolution
    Arthropoda
    Oelandocaris oelandica
    life habitat
    Opis:
    The arthropod Oelandocaris oelandica from the upper Middle Cambrian “Orsten” of Sweden was recently recognized as a member of the early phase of crustacean evolution based on additional morphological detail from new specimens. Here we present a detailed investigation of all available material. It includes the description of a 400 μm long specimen probably representing an early developmental stage. Variation in size correlated with variation of trunk−segment numbers allowed recognition of different instars. The largest specimens do not exceed an estimated length of about 1 mm, indicating that our material may consist only of immature specimens. The characteristic, extremely long antennula of O. oelandica branches into three long rods. It may have served as the major structure to sweep in food, aided by the two subsequent appendages. These and the more posterior limbs were also responsible for locomotion. Minute pores on the outer edges of the posterior limbs and on the trunk tergites possibly contained sensilla originally, which may have served as water−current detectors. The presence of a minute proximal endite only on the third head appendage suggests a rather basal position of this species within Crustacea, because comparable developmental stages of other known stem crustaceans have such an endite on more of their appendages. Reconstruction of O. oelandica and its life attitudes (referred to the largest instar known) benefited from the application of 3D modelling. These helped, e.g., in identifying the combination of the plesiomorphic feeding function of the antennulae and the specialisation of the exopods of the next two appendages as a step toward the development of a sweep−net mode of feeding, one of the key novelties in the evolution of Crustacea. Such a mode of feeding coupled with locomotion of the three anterior appendages is still practiced in the naupliar and metanaupliar phases of many extant eucrustaceans, and even some adults.
    Źródło:
    Acta Palaeontologica Polonica; 2008, 53, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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