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Tytuł:
Paleoecology of the large carnivore guild from the late Pleistocene of Argentina
Autorzy:
Prevosti, F.J.
Vizcaino, S.F.
Powiązania:
https://bibliotekanauki.pl/articles/23538.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Carnivora
carnivore
Late Pleistocene
Pleistocene
South America
paleoecology
population density
Argentina
paleontology
fossil carnivore
locality
biomass
ecology
Opis:
The paleoecology of the South American fossil carnivores has not been as well studied as that of their northern relatives. One decade ago Fariña suggested that the fauna of Río Luján locality (Argentina, late Pleistocene–early Holocene) is not balanced because the metabolic requirements of the large carnivores are exceeded by the densities and biomass of the large herbivores. This conclusion is based on the calculation of densities using allometric functions between body mass and population abundance, and is a consequence of low carnivore richness versus high herbivore richness. In this paper we review the carnivore richness in the Lujanian of the Pampean Region, describe the paleoecology of these species including their probable prey choices, and review the available information on taphonomy, carnivore ecology, and macroecology to test the hypothesis of “imbalance” of the Río Luján fauna. The carnivore richness of the Río Luján fauna comprises five species: Smilodon populator, Panthera onca, Puma concolor, Arctotherium tarijense, and Dusicyon avus. Two other species are added when the whole Lujanian of the Buenos Aires province is included: Arctotherium bonariense and Canis nehringi. With the exception of D. avus and Arctotherium, these are hypercarnivores that could prey on large mammals (100–500 kg) and juveniles of megamammals (>1000 kg). S. populator could also hunt larger prey with body mass between 1000 and 2000 kg. The review of the “imbalance” hypothesis reveals contrary evidence and allows the proposal of alternative hypotheses. If high herbivore biomass occurred during the Lujanian, a higher density of carnivores could be supported than as inferred from the power function of body size and population density.
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A microanatomical and histological study of the postcranial dermal skeleton in the Devonian sarcopterygian Eusthenopteron foordi
Autorzy:
Zylberberg, L
Meunier, F.J.
Laurin, M.
Powiązania:
https://bibliotekanauki.pl/articles/20289.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
microanatomical study
histology
postcranial dermal skeleton
Devonian
sarcopterygian
Eusthenopteron foordi
Sarcopterygii
Tetrapodomorpha
Tristichopteridae
Eusthenopteron
elasmoid scale
paleohistology
transmission electron microscopy
Late Devonian
Frasnian
fossil record
Opis:
The fin rays and two types of scales (enlarged and regular) of the Devonian sarcopterygian Eusthenopteron foordi are redescribed using light, scanning and transmission electron microscopy. The fin rays consist of lepidotrichia composed of ossified, jointed and branched segment pairs. The basal segments are cylindrical, but more distal elements are crescentic in section. The distribution of Sharpey’s fibres varies along the lepidotrichia. In the proximal segments, lateral bundles form a belt connecting adjacent hemisegments. In the distal segments, thin bundles are restricted to the area facing the fin surface. Both enlarged and regular scales have a similar spatial organisation. They are composed of a superficial highly mineralised layer covering a thick basal plate where the fibrils are distributed in superimposed strata forming a plywood−like structure. Nevertheless, the enlarged and regular scales differ in their shape, in the mineralised tissues of the superficial layer, and in the organisation of the plywood−like structure. The superficial layer of the enlarged scales is composed of parallel−fibered bone covering a deeper layer of woven−fibered bone. The basal plate is made of an orthogonal plywood−like structure. The thin, lamellar, imbricated regular scales display the characteristics of elasmoid scales. The mineralised tissue forming the superficial layer resembles that of extant teleost scales. In the basal plate, the twisted plywood−like structure is composed of closely packed fibrils that are preserved down to the ultrastructural level owing to the persistence of bridges connecting the fibrils. The enlarged and the regular scales of Eusthenopteron foordi do not present superficial odontodes, in contrast to ancestral thick rhomboid scales. The disappearance of enamel/enameloid and dentine may be related to the evolutionary trend towards a lightening of the dermal skeleton that would improve the swimming abilities of the animal. The characteristics of the dermal skeleton of Eusthenopteron foordi support the hypothesis that this process began early in osteichthyans.
Źródło:
Acta Palaeontologica Polonica; 2010, 55, 3; 459-470
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A microanatomical and histological study of the postcranial dermal skeleton of the Devonian actinopterygian Cheirolepis canadensis
Autorzy:
Zylberberg, L.
Meunier, F.J.
Laurin, M.
Powiązania:
https://bibliotekanauki.pl/articles/20617.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
microanatomical study
histology
postcranial dermal skeleton
Devonian
actinopterygian
Actinoterygia
Cheirolepis
ganoine
dentine
paleohistology
Canada
Cheirolepis canadensis
Opis:
The Devonian stem-actinoterygian Cheirolepis canadensis is potentially important to understand the evolution of the dermal skeleton of osteichthyans, but the last detailed histological study on this taxon was published more than forty years ago. Here, we present new data about the morphology and the histological structure of scales, fulcra, and fin-rays in the Devonian actinopterygian Cheirolepis canadensis through SEM and photomicroscopy. The scales have a typical palaeoniscoid organisation, with ganoine layers overlaying dentine and a bony basal plate, but the ganoine surface lacks the characteristic microtubercles that have been described on the ganoine surface of the scales of polypterids and many other actinopterygians. Fin-rays are composed of segmented and ramified lepidotrichia that show a structure reminiscent of scales, with ganoine and dentine components lying on a thick bony base. We describe articular processes between lepidotrichia that are reminiscent of, and plausibly homologous with, the peg-and-socket articulations between the scales. The analysis of the postcranial dermal skeleton of Cheirolepis canadensis shows that structural similarities between scales and lepidotrichia of this basal actinopterygian are greater than in more recent actinopterygians. The new data on histological and microanatomical structure of the dermal skeleton lend additional support to the hypothesis that lepidotichia are derivatives of scales, though they are also compatible with the more general hypothesis that scales, lepidotrichia and fulcra belong to the same morphogenetic system.
Źródło:
Acta Palaeontologica Polonica; 2016, 61, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Additional evidence for the drilling behavior of Paleozoic gastropods
Autorzy:
Gahn, F J
Fabian, A.
Baumiller, T.K.
Powiązania:
https://bibliotekanauki.pl/articles/20969.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
drilling behaviour
gastropod
Paleozoic
paleontology
Opis:
Although the record of Paleozoic drillholes is long and extensive, evidence pertaining to the identity of the drillers is sparse. The most conclusive evidence, a driller “caught in the act”, has been documented only once (Baumiller 1990). In that example, a drillhole in the calyx of a crinoid was found directly beneath an attached platyceratid gastropod. Additional evidence for drilling by platyceratids has been circumstantial, i.e., based on the association of platyceratids with certain blastoids and crinoids, and the presence of drillholes in other crinoid and blastoid taxa. To a skeptic, the lack of congruence between drilled and platyceratidinfested crinoids and blastoids is not sufficient evidence that platyceratids were the drillers. More conclusive evidence requires examples of drillholes in taxa that are known to have been platyceratid−infested, preferably from localities where both infested specimens and drilled specimens co−occur.
Źródło:
Acta Palaeontologica Polonica; 2003, 48, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Foraminiferal assemblages as palaeoenvironmental bioindicators in Late Jurassic epicontinental platforms: Relation with trophic conditions
Autorzy:
Reolid, M.
Nagy, J.
Rodriguez-Tovar, F.J.
Oloriz, F.
Powiązania:
https://bibliotekanauki.pl/articles/22691.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
foraminiferal assemblage
paleoenvironmental bioindicator
Late Jurassic
epicontinental platform
trophic condition
Jurassic
Foraminifera
neritic shelf
Boreal Realm
Tethys Ocean
Opis:
Foraminiferal assemblages from the neritic environment reveal the palaeoecological impact of nutrient types in relation to shore distance and sedimentary setting. Comparatively proximal siliciclastic settings from the Boreal Domain (Brora section, Eastern Scotland) were dominated by inner−shelf primary production in the water column or in sea bottom, while in relatively seawards mixed carbonate−siliciclastic settings from the Western Tethys (Prebetic, Southern Spain), nutrients mainly derived from the inner−shelf source. In both settings, benthic foraminiferal assemblages increased in diversity and proportion of epifauna from eutrophic to oligotrophic conditions. The proximal setting example (Brora Brick Clay Mb.) corresponds to Callovian offshore shelf deposits with a high primary productivity, bottom accumulation of organic matter, and a reduced sedimentation rate for siliciclastics. Eutrophic conditions favoured some infaunal foraminifera. Lately, inner shelf to shoreface transition areas (Fascally Siltstone Mb.), show higher sedimentation rates and turbidity, reducing euphotic−zone range depths and primary production, and then deposits with a lower organic matter content (high−mesotrophic conditions). This determined less agglutinated infaunal foraminifera content and increasing calcitic and aragonitic epifauna, and calcitic opportunists (i.e., Lenticulina). The comparatively distal setting of the Oxfordian example (Prebetic) corresponds to: (i) outer−shelf areas with lower nutrient input (relative oligotrophy) and organic matter accumulation on comparatively firmer substrates (lumpy lithofacies group) showing dominance of calcitic epifaunal foraminifera, and (ii) mid−shelf areas with a higher sedimentation rate and nutrient influx (low−mesotrophic conditions) favouring potentially deep infaunal foraminifers in comparatively unconsolidated and nutrient−rich substrates controlled by instable redox boundary (marl−limestone rhythmite lithofacies).
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New data on the Paleocene monotreme Monotrematum sudamericanum, and the convergent evolution of triangulate molars
Autorzy:
Pascual, R
Goin, F.J.
Balarino, L.
Udrizar Sauthier, D.E.
Powiązania:
https://bibliotekanauki.pl/articles/21782.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Monotremata
molar
Paleocene
Gondwana
triangulate molar
Monotrematum sudamericanum
monotreme
molar structure
evolution
Patagonia
paleontology
Opis:
We describe an additional fragmentary upper molar and the first lower molar known of Monotrematum sudamericanum, the oldest Cenozoic (Paleocene) monotreme. Comparisons suggest that the monotreme evolution passed through a stage in which their molars were “pseudo−triangulate”, without a true trigonid, and that the monotreme pseudo−triangulate pattern did not arise through rotation of the primary molar cusps. Monotreme lower molars lack a talonid, and consequently there is no basin with facets produced by the wearing action of a “protocone”; a cristid obliqua connecting the “talonid“ to the “trigonid” is also absent. We hypothesize that acquisition of the molar pattern seen in Steropodon galmani (Early Cretaceous, Albian) followed a process similar to that already postulated for docodonts (Docodon in Laurasia, Reigitherium in the South American sector of Gondwana) and, probably, in the gondwanathere Ferugliotherium.
Źródło:
Acta Palaeontologica Polonica; 2002, 47, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new Eliomys from the Late Miocene of Spain and its implications for the phylogeny of the genus
Autorzy:
Mansino, S.
Garcia-Alix, A.
Ruiz-Sanchez, F.J.
Montoya, P.
Powiązania:
https://bibliotekanauki.pl/articles/21189.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
In this paper, we describe a previously unknown species of the glirid Eliomys from the Late Miocene and Early Pliocene Cabriel, Alcoy and Granada basins of southeastern Spain. Eliomys yevesi sp. nov. is characterized by its relative small size, narrow lingual wall and common presence of two centrolophs in the upper molars, and well-developed centrol-ophids in the lower molars. The new species is the probable ancestor of E. intermedius, which in turn represents the ancestor of the extant E. quercinus. According to its morphologic and biometric features, the origin of E. yevesi sp. nov. is likely to be found in some population of E. truci from the Late Miocene. Based on these affinities, we propose the lineage E. truci-E. yevesi sp. nov.-E. intermedius-E. quercinus, in which there is a trend towards the development of centrolophs, as well as the reduction of accessory crests.
Źródło:
Acta Palaeontologica Polonica; 2015, 60, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new species of glirid rodent Vasseuromys from the Aragonian (Miocene) of the Ebro Basin (north-eastern Spain)
Autorzy:
Ruiz-Sanchez, F.J.
Murelaga, X.
Freudenthal, M.
Larrasoana, J.C.
Garces, M.
Powiązania:
https://bibliotekanauki.pl/articles/19965.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
new species
glirid rodent
rodent
Vasseuromys
Aragonia
Miocene
Ebro Basin
Spain
paleontology
Mammalia
Rodentia
Gliridae
systematics
Opis:
We describe a new species of Vasseuromys from the locality of Pico del Fraile 2 (PF2) in the Ebro Basin of northeastern Spain, which has yielded a fauna comprising several rodents and insectivores (Eumyarion cf. weinfurteri, Megacricetodon cf. primitivus, Democricetodon aff. hispanicus, Spermophilinus cf. besana, Microdyromys cf. legidensis, Galerix sp., and Lagomorpha indet.) indicative of Aragonian zones C or D. Vasseuromys cristinae sp. nov. differs from other Vasseuromysspecies in the constant presence of four extra ridges on the lower molars, one of them being connected to the posterolophid in the posterior valley, as well as three extra ridges on the upper molars, with none of them located outside the trigone. Morphological comparisons of this new taxon to other Vasseuromys species from the western Mediterranean area allow the reconstruction of their phylogenetic interrelationships during the Early and Middle Miocene of Europe, suggesting that V. cristinae sp. nov. is a descendant of V. autolensis.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First ? cimolodontan multituberculate mammal from South America
Autorzy:
Kielan-Jaworowska, Z
Ortiz-Jaureguizar, E.
Vieytes, C.
Pascual, R.
Goin, F.J.
Powiązania:
https://bibliotekanauki.pl/articles/20688.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Argentina
mammal
Cretaceous
Argentodites coloniensis
new species
new genus
La Colonia Formation
South America
Multituberculata
paleontology
Cimolodonta
Opis:
We describe a Cretaceous ?cimolodontan multituberculate p4 from South America, for which we erect the new genus and species Argentodites coloniensis. This new taxon is represented by an isolated ?left p4 from the Upper Cretaceous (?Campanian or Maastrichtian) La Colonia Formation of Patagonia (Fig. 1). It has a strongly convex anterior margin and prismatic enamel, which attest to its cimolodontan nature, while the previously known p4 (MACN−RN 975) from the Late Cretaceous Los Alamitos Formation is roughly rectangular, suggesting “plagiaulacidan” affinity. The presence of normal prismatic enamel in Argentodites suggests similarities to Ptilodontoidea. However, it differs from the Late Cretaceous and Paleocene Laurasian cimolodontans (including Ptilodontoidea) in having a long, straight posterior margin, a nearly straight dorsal margin, characteristic of some “Plagiaulacida”, and in having the lingual side close to the mirror image of the labial side, the character that poses difficulties in establishing whether it is a right or left tooth. Because of these differences we assign Argentodites to ?Cimolodonta, tentatively only, superfamily and family incertae sedis.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feeding habits and habitat of herbivorous mammals from the Early–Late Hemphillian (Miocene) of Costa Rica
Autorzy:
Perez-Crespo, V.A.
Laurito, C.A.
Arroyo-Cabrales, J.
Valerio, A.L.
Morales-Puente, P.
Cienfuegos-Alvarado, E.
Otero, F.J.
Powiązania:
https://bibliotekanauki.pl/articles/21193.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Carbon and oxygen stable isotope values in the dental enamel of fossils were used to infer the diet and habitat of the extinct equids Calippus hondurensis, Dinohippus mexicanus, and Protohippus gidleyi, the gomphothere Gomphotherium hondurensis, and the llama Hemiauchenia vera of the Early–Late Hemphillian (Hh2) from San Gerardo de Limoncito, Puntarenas province, Costa Rica. The results suggest that these mammals fed mainly on C₃ plants and lived in clearings of rainforests. This contrasts with previous studies from North America that indicated that the same species lived in forest savannas and fed mainly on C₄ plants, but it is similar to the results obtained from the palynological record of the area, as well as with several vegetation models suggesting the presence of humid tropical forest during the Miocene in Central America.
Źródło:
Acta Palaeontologica Polonica; 2018, 63, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on the foraminiferal genus Rotalipora Brotzen
Uwagi o rodzaju Rotalipora Brotzen (Foraminiferida)
Primechanija na temu roda Rotalipora Brotzen (Foraminiferida)
Autorzy:
Longoria, J.F.
Powiązania:
https://bibliotekanauki.pl/articles/21718.pdf
Data publikacji:
1973
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Źródło:
Acta Palaeontologica Polonica; 1973, 18, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crural bases position as a structural criterion for supraspecific diagnosis of Early Jurassic zeilleriid brachiopods
Autorzy:
Baeza-Carratala, J.F.
Garcia Joral, F.
Powiązania:
https://bibliotekanauki.pl/articles/945875.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
Brachiopoda
Zeilleriidae
systematics
structural criterion
supraspecific diagnosis
Jurassic
Early Jurassic
zeilleriid brachiopod
brachiopod
Opis:
Analysis of the internal structure carried out on several representative genera of the brachiopod family Zeilleriidae from the Lower Jurassic of the Betic Ranges (SE Spain), complemented with specimens from nearby domains such as the Iberian Range and Lusitanian Basin, has enabled to propose a model for discrimination of genera based on the relative position of the crural bases with respect to the hinge plates. This particular feature has been analysed in the genera Zeilleria, Bakonyithyris, Securina, Neozeilleria, Cincta, Aulacothyris, and Plesiothyris, revealing three different basic patterns of crural bases arrangement: a Zeilleria-type, with crural bases distinctly arising from the ventral side of the hinge plates; a Securina-type, with crural bases originating transversally to the hinge plates and dorsally prominent; and a Bakonyithyris-type, intermediate between both previous patterns.
Źródło:
Acta Palaeontologica Polonica; 2014, 59, 3; 651-661
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The halobiid bivalve genus Enteropleura and a new species from the Middle Anisian of Guangxi, Southern China
Autorzy:
Chen, J
Stiller, F.
Powiązania:
https://bibliotekanauki.pl/articles/20942.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Anisian
Enteropleura
Triassic
halobiid bivalve
Middle Anisian
Bivalvia
China
Guangxi
new species
Southern China
Halobiidae
paleontology
Opis:
Enteropleura is a short−ranged early Middle Triassic bivalve genus, of importance with regard to biostratigraphy and the phylogeny of the Halobiidae. It comprises five species from the Alps, the Dinarides, Nevada, and southwestern China. Enteropleura walleri sp. nov. from the Fengshan District, northwestern Guangxi, southwestern China, occurs in the central area of the Triassic Nanpanjiang Basin. The new species is of late Middle Anisian age, penecontemporaneous to the species from Europe and Nevada. Morphologically, E. walleri sp. nov. is similar to Enteropleura jenksi from Nevada, Enteropleura bittneri from Austria, and Enteropleura lamellosa from Croatia, but it differs significantly from Enteropleura guembeli from Hungary. Two species−groups of Enteropleura thus may be differentiated, E. guembeli group and E. bittneri group. Re−examination of E. guembeli reported from the Anisian basin slope facies in Guizhou, southwestern China, confirms its taxonomic status.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The oldest post-Paleozoic (Ladinian, Triassic) brachiopods from the Betic Range, SE Spain
Autorzy:
Baeza-Carratala, J.F.
Perez-Valera, F.
Perez-Valera, J.A.
Powiązania:
https://bibliotekanauki.pl/articles/22178.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Triassic brachiopods from the Betic Range were unknown hitherto. Herein we describe the first brachiopod occurrences in the early Ladinian of this domain referable to a new genus and species Misunithyris goyi derived from three localities of the south-Iberian Triassic outcrops. The analysis of internal and external characters of this brachiopod allowed to characterize systematically and biogeographically this fauna in a chronostratigraphic interval when the paucity of brachiopod records is attributable to the entire peri-Iberian epicontinental platform system established in the westernmost Tethyan margin. The new record is endemic to the Betic Range and represents a new faunal constituent of the multicostate zeillerids stock. This fauna inhabited the epicontinental seas of the Sephardic bioprovince since a closer affinity with the low-latitude Tethyan assemblages is revealed. The possible linkage of the Triassic stock with the Early–Middle Jurassic multicostate zeillerid representatives suggests feasible phylogenetic relationships between both groups.
Źródło:
Acta Palaeontologica Polonica; 2018, 63, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Albian to early/mid - Cenomanian ostracodes from Northern Galala Plateau, Egypt
Późnoalbskie - wczesno/środkowocenomańskie małżoraczki z Płaskowyżu Pólnocnej Galali (Egipt)
Autorzy:
Sczechura, J.
Abd-Elshafy, E.
Babinot, J.-F.
Powiązania:
https://bibliotekanauki.pl/articles/21037.pdf
Data publikacji:
1991
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Middle Cretaceous ostracodes from two sections in the Northern Galala Plateau, western coastal Gulf of Suez (Egypt) are presented. 30 species have been recorded, of which 4 are new: Asciocythere galalaensis, Perissocytheridea ignota, Eocytheropteron pecteniferum and ?Spinoleberis calcalifera. Most of the species have been known so far from the Albian and/or Cenomanian of the South Tethys, especially the Near East. No species common for these ages from the North and South Tethys i.e. Africa and Europe, have been found. Ostracode associations probably show the late Albian to early/mid-Cenomanian age. The distribution is related to fluctuating conditions within the studied area, from euhaline to brackish/shallow water environments.
Opracowano małżoraczki z osadów środkowej kredy, występujących na zachodnim brzegu Zatoki Suezkiej (Egipt). Małżoraczki pochodzą z dwóch odsłonięć (Ras El Abd i Khashm El Galala) (figs. 1—3) z osadów, których dolna część zaliczana jest do facji Piaskowców. Nubijskich, a górna część — do formacji Galala. W oparciu o otwornice Abd-Elshafy i Atta (w druku a, b) zaliczyli dolną część osadów do dolnego cenomanu natomiast górną do górnego cenomanu. Opisano 30 gatunków małżoraczków, w tym 4 nowe: Asciocythere galalaensis, Perissocytheridea ignota, Eocytheropteron pecteniferum i Spinoleberis calcalifera. Analiza ilościowego i jakościowego rozprzestrzenienia małżoraczków pozwoliła wydzielić 2 zespoły (jeden zdominowany przez Cytherella, drugi zdominowany przez Perissocytheridea), występujące przemiennie w badanych profilach (fig. 4) i pozwalające wydzielić 4 ekozony. Uważa się, że wydzielone ekozony są odbiciem fluktuacji w zasoleniu, dynamice i głębokości zbiornika; ekozona z wyraźną obecnością Cytherella odpowiada środowisku morskiemu (euhalinowemu), natomiast ekozona z Perissocytheridea charakteryzuje środowisko brakiczne. Wyróżnione ekozony pokrywają się w znacznym stopniu z biozonami wyróżnionymi w badanych odsłonięciach w oparciu o otwornice (Abd-Elshafy i Atta, w druku b). Małżoraczki sugerują jednak nieco starszy wiek osadów (figs. 2, 3), tj. górnoalbski — wczesno/środkowocenomański. Uznaje się, że ekozona 1 (w oparciu o małżoraczki zaliczona do albu) reprezentuje środowisko regresywne, natomiast ekozona 2 (?3) (na podstawie małżoraczków zaliczona do cenomanu) wyraża stopniowe tendencje w kierunku otwartego morza. Sugerowane tendencje w rozwoju środowiska środkowokredowego są w zgodzie z proponowanymi „krzywymi transgresji-regresji” dotyczącymi albu-turonu na Środkowym i Dalekim Wschodzie opracowanymi przez Riché i Přestat (1980). Z rozprzestrzenienia regionalnego badanych małżoraczków wynika, że są one ograniczone do Afryki północnej i Bliskiego Wschodu, wykazując większe podobieństwo do synchronicznych małżoraczków z tego drugiego obszaru. Należą one zatem do północnoafrykańsko-bliskowschodniej prowincji małżoraczkowej wydzielonej przez Babinot (1985).
Źródło:
Acta Palaeontologica Polonica; 1991, 36, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 52

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