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Tytuł:
Morphometric variation of reindeer remains (Rangifer tarandus Linnaeus, 1758) from Late Pleistocene cave localities in Poland
Autorzy:
Stefaniak, K.
Piskorska, T.
Witkowska, A.
Wojtal, P.
Powiązania:
https://bibliotekanauki.pl/articles/191218.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Rangifer tarandus
morphometry
Late Pleistocene
Polska
Opis:
The paper deals with the morphometric analysis of remains of the reindeer Rangifer tarandus Linnaeus, 1758 from 20 Late Pleistocene cave localities in Poland. In most of the localities, the species was the most abundant component of the large mammal fauna; the remains came from individuals, killed by predators, including man. The measurements of the remains were compared with those of reindeer from localities in Germany, Moldova, Ukraine and Russia. The measurements of the reindeer from Poland were intermediate between the smaller and more slender reindeer from north-western Europe and the larger reindeer from southern and eastern Europe; the antlers from the localities studied mainly represented the tundra form of Rangifer tarandus. The forest form of the species was represented by a few antlers. With respect to the ages of individuals, the reindeer from the Polish sites belonged to the age classes of under 2 years, 5–6 years and 6–7 years.
Źródło:
Annales Societatis Geologorum Poloniae; 2012, 82, 2; 177--191
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Middle and Late Pleistocene glacial-interglacial succession of eastern Belarus
Autorzy:
Pavlovskaya, I.E.
Powiązania:
https://bibliotekanauki.pl/articles/2059427.pdf
Data publikacji:
2000
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Belarus
Middle Pleistocene
Late Pleistocene
Dniepr Glaciation
stratigraphy
Opis:
Detailed geological and palaeobotanical study of about 400 boreholes through Quaternary deposits in eastern Belarus has enabled the recognition of a number of Middle and Late Pleistocene interglacial sites and demonstrated the stratigraphical position of Alexandrian (Holsteinian) and Muravian (Eemian) Interglacial sediments. These stratigraphic markers are separated by a single glacial sequence, corresponding to the Dnieper (Saalian) Glaciation. This contradicts previous views suggesting the occurrence of two glaciations during the Late Middle Pleistocene in eastern Belarus (Dnieper and Sozh). The glacial sediments represent the recession phases of a glacial stage that may be correlated with the Drenthe Substage of the Saalian Glaciation.
Źródło:
Geological Quarterly; 2000, 44, 2; 199-203
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Pleistocene loess-paleosol and vegetation successions at Tarnawce (San River valley, Carpathians foothills, Poland)
Autorzy:
Komar, Maryna
Łanczont, Maria
Powiązania:
https://bibliotekanauki.pl/articles/2027418.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Late Pleistocene
paleosol
loess
pollen
Carpathian Foothills
Opis:
The Tarnawce I profile, which occurs in the marginal eastern part of the Polish Westem Carpathians, contains loesses sq representing three last glacial cycles. In this paper we report the results of pollen analysis of the Eemian-Early Glacial pedocomplex and of the Lower plcni-Visrulian loesses with an interstadiał paleosol. The pollen spectra of22 samples were determined. The pollen diagram was divided into 7 local pollen assemblage zones (L PAZ). Interglacial climatic optimum was recorded with the Eemian type of vegetation in the T-4 zone. The coldest conditions occurred during the accumulation of loess, which separates the interglacial and interstadiał soils.
Źródło:
Studia Quaternaria; 2002; 27-35
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy minerals in the key Late Pleistocene loess-palaeosol section at Kolodiiv (East Carpathian Foreland, Ukraine)
Autorzy:
Racinowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/2059497.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Ukraine
Late Pleistocene
loess
palaeosols
heavy minerals
Opis:
Successions of loess and other deposits in the Kolodiiv profile, formed during the Eemian Inter glacial and Vistulian Glacial (OIS 5-2), are characterized using the results of heavy mineral analysis. Weathered local carbonate rocks and fluvial deposits (Wartanian Glacial, OIS 6) are used for comparison. It was found that the content of minerals derived from weathered and redeposited Carpathian Flysch increases from bottom to top of the profile. The entire loess succession accumulated under similar lithodynamic conditions and the palaeosols are of similar character.
Źródło:
Geological Quarterly; 2007, 51, 2; 185-188
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemical composition of Vistulian loess and micromorphology of interstadial palaeosols at the Kolodiiv site (East Carpathian Foreland, Ukraine
Autorzy:
Łącka, B.
Łanczont, M.
Madeyska, T.
Boguckyj, A.
Powiązania:
https://bibliotekanauki.pl/articles/2059503.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Ukraine
Late Pleistocene
palaeosols
loess
micromorphology
geochemistry
Opis:
This paper summarizes geochemical and palaeopedological investigations of the Upper Pleistocene loess-palaeosol sequences at the Kolodiiv site. The Kolodiiv 2, 3 and 5 profiles were selected for this study. The Kolodiiv 2 profile contains loesses, interglacial (Eemian) and interstadial (Vistulian) palaeosols. A set of Early Vistulian soils over lying Eemian gyttja and peat is exposed in the Kolodiiv 3 and 5 profiles. The mineral composition of the 50-2 mm silt fraction was analysed using non-oriented powder samples by means of X-ray dif - fraction. The total concentrations of nine major (Si, Ti, Al, Fe, Mn, Mg, Ca, K and Na) and nine trace elements (Zn, Pb, Ni, Rb, Cr, Sr, Ba, Co, V) as well as the humus content and loss on ignition were measured. The major elements concentrations in mineral deposits from the Kolodiiv 2 loess-palaeosol sequence indicate that the loess particles were derived from poorly weathered source rocks that have under - gone at least one sedimentary cycle. Climatic conditions have strongly in fluenced the mobilization and accumulation of elements in the palaeosol horizons due to the changes in the intensity of weathering and pedogenic processes. For the micromorphological study, ten samples from the Kolodiiv 3 and 5 profiles were used. Thin sections representing the Kolodiiv and Dubno set of palaeosols from Early Vistulian and Middle Pleniglacial show, be sides palaeopedologic characteristics, significant evidence of redeposition of sediments and soils.
Źródło:
Geological Quarterly; 2007, 51, 2; 127-146
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Levallois Tradition epigones in the Middle Nile Valley: survey in the Affad Basin
Autorzy:
Osypińska, Marta
Osypiński, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1727950.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
Sudan
Southern Dongola Reach
Late Pleistocene occupation
survey
Opis:
The paper presents the results of an archaeological ground survey aimed to record prehistoric settlement landscape in chosen parts of the Southern Dongola Reach (Tergis, Affad and El-Nafab districts). The project fills in the gaps in earlier research on the right bank of the Nile. Numerous new sites were recorded, all reflecting a frequently occupied level of silts and sands originating in the former river valley aggradations. Prospection of locations recorded in 2003 and later demonstrated also the progressing destruction of archaeological sites on the fringes of modern settlement and the new road from Karima to Nawa.
Źródło:
Polish Archaeology in the Mediterranean; 2015, 24(1); 601-626
1234-5415
Pojawia się w:
Polish Archaeology in the Mediterranean
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemical properties of the Late Pleistocene loess-soil sequence in Dankowice (Niemcza-Strzelin Hills)
Autorzy:
Raczyk, J.
Jary, Z.
Korabiewski, B.
Powiązania:
https://bibliotekanauki.pl/articles/294751.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
loess-soil sequence
chemical composition
Late Pleistocene
SW Poland
Opis:
Loess-soil sequences provide one of the most continuous and detailed records of the climate changes on land areas in the Quaternary. The Late Pleistocene loess section in Dankowice (Niemcza-Strzelin Hills) is one of the best recognized in SW Poland. For the investigation of the chemical composition of loess-soil sequence in Dankowice, 31 loess samples were tested. Ten main oxides were determined (SiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O, TiO2 and P2O5) using certified reference materials to obtain good credibility of the analysis. The chemical composition of loess from Dankowice is similar to the results presented in the world loess literature. The characteristic feature is extremely high concentration of the silica. The chemical composition of loess in Dankowice is differentiated within the vertical sequence and confirm previous division of litho-pedostratigraphic units. Therefore, the chemostratigraphic method can be successfully used as a one of lithostratigraphic methods. Decreasing values of the chemical weathering indices to the top of the section may indicate that the source areas of loess silt have provided material over time, less and less transformed by prolonged and intense chemical weathering processes.
Źródło:
Landform Analysis; 2015, 29; 49-61
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chronostratigraphy and changes of environment of Late Pleistocene and Holocene at Starunia palaeontological site and vicinity (Carpathian region, Ukraine)
Autorzy:
Sokołowski, T.
Stachowicz-Rybka, R.
Powiązania:
https://bibliotekanauki.pl/articles/191571.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Late Pleistocene
Holocene
fluvial deposits
environment
Starunia
Carpathian region
Ukraine
Opis:
This paper presents the results of absolute dating and biostratigraphical analysis carried out for alluvial sediments of an abandoned Starunia ozokerite mine located in the Velyky Lukavets River valley, in which large mammal remains were discovered in the first half of the 20th century. The sediments build up three terrace levels. The highest one, up to 8 m high (terrace II), is likely to be associated with a stage of aggradation, as well as with a short episode of valley broadening, which occurred in the Weichselian Late Pleniglacial. The lower one, 4 m high (terrace I), is most likely to be linked with the Holocene, despite a considerable transformation of its top due to mining activity. The lower part of this terrace cover bears coarse-grained channel sediments dated to 120.6-58.9 ka BP (Eemian Interglacial?-Early Pleniglacial - OIS 5e, 4 and 3), and overbank (distal floodplain) mud with intercalations of biogenic deposits (peat, peat mud and biogenic mud). The overbank deposits are dated to 48.2-11.11 ka BP (Glinde Interstadial?-Younger Dryas, OIS 3-2) and are overlain by Holocene (OIS 1) mud and biogenic deposits. In boreholes drilled in the vicinity of the present-day river channel, younger sediments occur more frequently. These include sediments originating from the Late Weichselian overlain by Holocene sediments. However, sediments originating exclusively from the Holocene are infrequent. The deposition of sediments took place in specific conditions of a permanent saturation of the environment with brine, petroleum and thickened bitumen. In the longest period of deposition (48.2-1.27 ka BP), ephemeral swamps, ponds and lakes were developed in different parts of the floodplain. They were marked by the presence of: Juncus glaucus/effusus, J. articulatus, Typha sp., Batrachium sp., Potamogeton filliformis, Bidens tripartita, Ranunculus sceleratus and Phragmites communis, as well as by halophytic species, like: Zannichellia palustris, Triglochin maritimum, Schoenoplectus tabernemontani, Puccinelia distans and Eleocharis palustris. Rhythmic oscillations between cold and warm climatic conditions, typical of the Weichselian age and well identified in Western Europe, are here marked by the changes of plant communities (woody assemblages passing into steppe and tundra), but are not noticeably recorded in the sediments of the Velyky Lukavets River. This shows that the greatest part of the discussed period involved the formation of poorly differentiated silty overbank sediments with intercalations of biogenic sediments. However, the variability of sediments provides evidence for extreme events which occurred in the Holocene.
Źródło:
Annales Societatis Geologorum Poloniae; 2009, 79, No 3; 315-331
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Osteoderm histology of Late Pleistocene cingulates from the intertropical region of Brazil
Autorzy:
Da Costa Pereira, P.V.L.G.
Victer, G.D.
Porpino, K.O.
Bergqvist, L.P.
Powiązania:
https://bibliotekanauki.pl/articles/945892.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
osteoderm
histology
Late Pleistocene
Pleistocene
Cingulata
mammalia
Glyptodontidae
Pachyarmatherium
paleohistology
intertropical region
Brazil
Opis:
During the Late Pleistocene, several possibly endemic cingulate species, known mostly from isolated osteoderms, carapace fragments, and caudal tubes, coexisted in the Brazilian Intertropical Region. Here, we describe the osteoderm microstructure of Pachyarmatherium brasiliense, as well as the glyptodonts Panochthus greslebini, Panochthus jaguaribensis and Glyptotherium sp., in order to provide additional species-diagnostic characters and shed light on their evolutionary relationships. Pachyarmatherium brasiliense lacks several derived features shared by glyptodonts and pampatheres, such as extensive bone remodeling, fibers arranged in large bundles, and relatively poorly developed layers of compact bone, thus supporting its exclusion from glyptodonts as suggested by a recent cladistic study. The osteoderm histology of P. greslebini resembles that of other species of Panochthus (e.g., Panochthus frenzelianus). By contrast, the presence of relatively thick layers of compact bone, the configuration and size of resorption areas, the absence of randomly oriented lateral fiber bundles, and the absence of an intermediary region between the compact and trabecular bone potentially support the exclusion of Panochthus jaguaribensis from the genus. Finally, osteoderms of the Brazilian specimens of Glyptodontinae share histological features with Glyptotherium floridanus, rather than Glyptodon, thus reinforcing their assignment to Glyptotherium. These results highlight the relevance of histological osteoderm characters in cingulate systematics, ands call for further and more comprehensive studies.
Źródło:
Acta Palaeontologica Polonica; 2014, 59, 3; 543-552
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Chronostratigraphy of the late Vistulian in central Poland and the correlation with Vistulian glacial phases
Autorzy:
Dzieduszyńska, Danuta A.
Forysiak, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2025178.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radiometric methods
14C probability density function
extraglacial environment
last glacial phases
Late Pleistocene
Opis:
The Vistulian decline was a period of rapid environmental events. The authors correlated ages of the last Scandinavian Ice Sheet limits in northern Poland with ages of prominent events adapting the conditions of periglacial environment of Central Poland in response to the Late Vistulian climate warming. Ages from previous thematic geological and palaeogeographical studies were collected. The approach used indicates that despite methodological uncertainties and sometimes inconsistency of ages, it is especially helpful in timing of first warming signals (ca. 19–18 cal ka BP) and establishing of environmentally bipartite 3 millennia of the Oldest Dryas in the extraglacial zone. Abrupt warming at the onset of the Bølling-Allerød is well registered in biotic and abiotic archives available from Central Poland and remains in agreement with the large recession of the southern ice sheet margin.
Źródło:
Studia Quaternaria; 2019, 36; 137-145
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lacustrine deposits in northern part of the Knyszyńska Forest - the remains of water bodies
Utwory jeziorne w północnej części Puszczy Knyszyńskiej - pozostałości po zbiornikach wodnych
Autorzy:
Micun, K.
Powiązania:
https://bibliotekanauki.pl/articles/292941.pdf
Data publikacji:
2009
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
gytie
późnoplejstoceńskie pojezierze
Puszcza Knyszyńska
torfowiska
Knyszyńska Forest
Late Pleistocene lakeland
lacustrine deposits
peatlands
Opis:
The aim of this study was to delimit lacustrine deposits underlaying present peatlands. On this basis, the location of water bodies in late Pleistocene and early Holocene was recognized. The lakes' occurrence was presented on the background of geomorphological conditions. Lacustrine deposits occur mainly in depressions of the northern part of the Knyszyńska Forest. They are placed in upper parts of the Czapielówka River, Jałówka River, middle Sokołda River and upper Kumiałka River catchments. The thickness of gyttja varies between 0.4 and 2.5 m. These are detrital, calcareous and clay-calcareous gyttjas. Lacustrine sediments fill the bottoms of various melt-out depressions. The origin of these depressions, as well as the whole glacial relief of the terrain, is often linked to deglaciation of the Warta ice sheet. However, kame deposits in the Janów village are younger than Warta glaciation. Moreover, the catchment relief of the upper Kumiałka River is similar to the relief which originates from Vistulian glaciation. Besides, there are boulder deposits directly under the lacustrine deposits. These three facts indicate a younger age of the melt-out depressions in the upper Kumiałka River catchment.
W artykule przedstawiono wyniki badań litologicznych i geomorfologicznych przeprowadzonych w północnej części Puszczy Knyszyńskiej. Celem badań było rozpoznanie rozprzestrzenienia utworów jeziornych, występujących pod współczesnymi torfowiskami. Na tej podstawie odtworzono rozmieszczenie i zasięg zbiorników wodnych w późnym plejstocenie i wczesnym holocenie na tle uwarunkowań geomorfologicznych. Stwierdzono stosunkowo powszechne występowanie utworów jeziornych w dnach obniżeń w północnej części Puszczy Knyszyńskiej. Występują one w górnych fragmentach zlewni Czapielówki, Jałówki, środkowej Sokołdy, w rejonie Czarnej Białostockiej oraz dalej na północy, w zlewni górnej Kumiałki. Miąższość gytii wynosi od 0,4 do 2,5 m. Są to gytie detrytusowe, węglanowe i ilasto-wapienne. Utwory jeziorne zalegają w dnach różnego rodzaju obniżeń wytopiskowych. Genezę wytopisk, jak i całej rzeźby glacjalnej tego terenu, łączy się najczęściej z zanikiem lądolodu zlodowacenia Warty. Jednak wiek utworów kemowych w Janowie, nawiązanie rzeźby do niższych, młodszych poziomów morfologicznych oraz występowanie bezpośrednio pod osadami jeziornymi utworów ablacyjnych i zwałowych przemawiają za młodszym wiekiem wytopisk położonych w zlewni górnej Kumiałki.
Źródło:
Journal of Water and Land Development; 2009, no. 13b; 137-147
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stratigraphic position of tills in the Orłowo Cliff section (northern Poland): a new approach
Autorzy:
Woźniak, Piotr Paweł
Sokołowski, Robert J.
Czubla, Piotr
Fedorowicz, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/2025278.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lithofacies analysis
petrographic composition
till fabric
TL dating
Middle and Late Pleistocene
Nauki o Ziemi
Opis:
The site at Orłowo Cliff was used to analyse the stratigraphic position and palaeogeographic interpretations of the properties and depositional conditions of two basal tills from the Late Pleistocene. A multi-proxy approach involved lithofacies, petrographic analysis of the fine gravel fraction, analyses of indicator erratics and till fabric. TL dating of intra-moraine deposits was used to determine depositional time frames of tills. The sediment profile at Orłowo Cliff shows a distinct reduction in number of Pleistocene units. Obtained dating results suggest the presence of Middle and Late Pleistocene fluvial units. The main issue discussed is the stratigraphic position of the older till (Unit O-4). It can be assumed that this till was deposited probably during the Middle Weichselian (MIS4). At Orłowo Horn the till of Unit O-4 reveals incorporation of the erratic material derived from an older till in the surrounded area (according to petrographic composition – probably from MIS 8). The younger till (Unit O-6) was deposited in the Late Weichselian (MIS 2). Moreover, the till of Unit O-6 is characterised by a significant shift towards the south-west in terms of the erratic origin in Unit O-4.
Źródło:
Studia Quaternaria; 2018, 35; 25-40
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A small camelid Hemiauchenia from the Late Pleistocene of Hidalgo, central Mexico
Autorzy:
Bravo-Cuevas, V.M.
Jimenez-Hidalgo, E.
Cuevas-Ruiz, G.E.
Cabral-Perdomo, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/22741.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
small camelid
camelid
Hemiauchenia
Late Pleistocene
Hidalgo
Mexico
Camelidae
Pleistocene
paleontology
geological setting
systematics
mandible
dentition
postcranial bone
remains
tooth
fossil
Opis:
Pleistocene camels from Mexico include representatives of llamas and camels. Their record spans from the Early Blancan to the Late Pleistocene, based on several localities in the northern, northwestern and central parts of the country, with members of the genus Hemiauchenia being particularly well represented. New specimens of a small llama, collected in the state of Hidalgo, central Mexico, are assigned to Hemiauchenia gracilis owing to a combination of cranial and postcranial characters, including a short upper premolar−molar series, the presence of a two−rooted P3, molars covered by a thin layer of cementum, U−shaped molar crescents, well−developed styles and ribs, a small degree of crenulation, a relatively short lower tooth row, the lack of p1 and p3, weakly developed anteroexternal stylids, a shallow and slender mandible, and long and slender metatarsals and phalanges. The material described here extends the Pleistocene geographic distribution of H. gracilisfrom northern to central Mexico, and its biochronological range from the Early Blancan to the Late Pleistocene (Rancholabrean), thus making it the southernmost record and the geochronologically youngest occurrence of this species in North America. The mesowear pattern of the material from Hidalgo suggests that these animals were mainly browsers. Their estimated body mass resembles that of Blancan specimens from Guanajuato, implying that this species maintained approximately the same body mass throughout its biochronological range in central Mexico.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A critical review and reinterpretation of bio-, litho- and seismostratigraphic data of the Southern Baltic deposits
Autorzy:
Zachowicz, J.
Miotk-Szpiganowicz, G.
Kramarska, R.
Uścinowicz, Sz.
Przedziecki, P.
Powiązania:
https://bibliotekanauki.pl/articles/1204982.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
pollen and diatoms diagrams
14C datings
bio- litho- and seismostratigraphy
Late Pleistocene
Holocene
southern Baltic Sea
Opis:
The aim of this study was the reinterpretation of the published and unpublished Late-Pleistocene and Holocene pollen and diatom diagrams of deposits from the sedimentary basins of the Southern Baltic Sea and the correlation of the distinguished biostratigraphic units with lithological parameters, seismostratigraphic units. Chronostratigraphic subdivision of the Late Pleistocene and Holocene was also made. To facilitate the correlation and reinterpretation of the results of biostratigraphic (palynological and diatom) analyses, new unified and simplified diagrams were drawn using the POLPAL software. Such diagrams were constructed for all the sites under comparison, even for those of no numerical data. In such cases, the published diagrams were scanned and their percentage values were the basis for new diagrams. A review and reinterpretation of biostratigraphic data show an almost complete lack of palynological documentation and diatom diagrams for the Late Pleistocene period and poor documentation for the Early Holocene. Middle and Late Holocene Baltic muds have the best biostratigraphic documentation and radiocarbon dating, which greatly facilitates their location on the geological time scale. Among the Southern Baltic postglacial sediments three lithostratigraphic units were identified. They differ in their lithological features reflecting the conditions prevalent in the sedimentary basin during deposition. It should be noted that these units meet no formal criteria for distinguishing lithostratigraphic units. Similarly, within the Late Pleistocene and Holocene sediments of Southern Baltic deep-water basins, three main seismostratigraphic complexes have been identified. The integrated analysis of seismoacoustic profiles, lithological profiles of cores and reinterpretated biostratigraphic data allow a correlation of the bio-, litho- and seismostratigraphic units with chronostratigraphic units and Baltic evolutionary phases.
Źródło:
Polish Geological Institute Special Papers; 2008, 23; 117-138
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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