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308 results for “Early age”
Early EASE-GRID Sea Ice Age, 1978-1983
<p>Early spin-up period Arctic sea ice age data for 1978 through 1983. This product augments the NSIDC sea ice age product: "EASE-Grid Sea Ice Age, Version 4.1" (Tschudi et al., 2019a), which begins in January 1984. See the main product website for complete documentation. The age is estimated via Lagrangrian tracking based on the NSIDC sea ice motion product (Tschudi et al., 2019b), whose source data is primarily passive microwave brightness temperatures and drifting buoys. Age is estimated weekly as annual age categories. Values are: 1 for "first-year ice", ice that is 0-1 years old, and so on for older ice. The ice is "aged" once each year during the week of the annual sea ice minimum extent, generally sometime in September. </p> <p>In this product, the initialization of the field begins with the first available data in late-October 1978. For the existing ice at that time, age is initialized at the start of the product with age=1. The first week of the data, because it is after the minimum, the age of existing ice is augmented to age=2 and new ice is given age=1. So, the first field in 1978 has only two age categories of 1 (0-1 years old) or 2 (1-2 years old) and this continues through 1978. This means that the age of the ice that formed between the minimum in September and the beginning of the data in late-October 1978 is overestimated by one year. In subsequent years, the oldest ice category will continue to overestimate some of the ice pack until that initial ice either: (1) melts, (2) is transported out of the Arctic, or (3) reaches the maximum age in the product (16 years).<br> <br> Much of the the existing ice in 1978 may be older than 1-2 years old as ice may stay in the Arctic for 5 or more years, but the data availability and the Lagrangian methodology cannot give a specific until the product is fully "spun up". For each subsequent year, a one-year older age category is added in the week of each year's extent minimum. Note that due to the assumption made at the beginning of the product in 1978, the oldest ice category may overestimate the true age of some parcels by one year. </p> <p>Tschudi, M., W. N. Meier, J. S. Stewart, C. Fowler, and J. Maslanik. (2019a). EASE-Grid Sea Ice Age, Version 4 [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/UTAV7490FEPB. Date Accessed 02-20-2023.</p> <p>Tschudi, M., W. N. Meier, J. S. Stewart, C. Fowler, and J. Maslanik. (2019b). Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vectors, Version 4 [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/INAWUWO7QH7B.</p>
Multi-faceted analyses of Poland's Bronze and Early Iron Age hoards: Fig.5. Pottery (A, C), animal bones (B), a human skull (C, D), and a flint tool (D) excavated from underneath the stone layer in Kaliszany (archaeological site no. 3)
<p>The set contains a figure, with with photographs that show examples of finds discovered during excavations at archaeological site 3 in Kaliszany, Wągrowiec commune, Poland. It is a stone and earth structure in which a hoard of metal objects dating to the Late Bronze Age was discovered in 1943. The photo is from the 2022 survey, when the south-western part of the structure was explored. <br><br>The paper and data were prepared as part of a project funded by the National Science Centre, Poland: <em>A Biography of Late Bronze and Early Iron Ages Hoards. A Multi-Faceted Analysis of Metal Objects Related to Monumental Constructions in Poland</em> (UMO-2021/41/B/HS3/00038)</p>
Multi-faceted analyses of Poland's Bronze and Early Iron Age hoards: Fig.1. Location of hoards mentioned in the text: white dots represent locations of hoards examined in the Biography of Hoards project; black dots represent locations of hoards examined in other multi-faceted projects
<p>The set contains a figure, with data, on the location of the hoards included (described in the related paper).<br><br>The paper and data were prepared as part of a project funded by the National Science Centre, Poland: <em>A Biography of Late Bronze and Early Iron Ages Hoards. A Multi-Faceted Analysis of Metal Objects Related to Monumental Constructions in Poland</em> (UMO-2021/41/B/HS3/00038)</p>
Multi-faceted analyses of Poland's Bronze and Early Iron Age hoards: Fig.3. Workflow in the Biography of Hoards project
<p>The set contains a figure and editable files associated with the figure.</p> <p>Figure presenting workflow of the project described in the related paper.</p> <p>The paper and data were prepared as part of a project funded by the National Science Centre, Poland: <em>A Biography of Late Bronze and Early Iron Ages Hoards. A Multi-Faceted Analysis of Metal Objects Related to Monumental Constructions in Poland</em> (UMO-2021/41/B/HS3/00038)</p>
Phlorest phylogeny derived from Kitchen et al. 2009 'Bayesian phylogenetic analysis of Semitic languages identifies an Early Bronze Age origin of Semitic in the Near East'
<p>Cite the source of the dataset as:</p> <blockquote> <p>Kitchen A, Ehret C, Assefa S & Mulligan CJ. 2009. Bayesian phylogenetic analysis of Semitic languages identifies an Early Bronze Age origin of Semitic in the Near East. Proceedings of the Royal Society B: Biological Sciences, 270(1668), 2703-2710.</p> </blockquote>
Fig. 3 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 3. Sedimentary log, paleontological sampling points, microfauna assemblages and paleosalinity estimation in the Goychay section.
Fig. 8 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 8. Sedimentary log, paleontological sampling points, microfauna assemblages and paleosalinity estimation in the Hajigabul section.
Fig. 7 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 7. Magnetostratigraphy of the Goychay section. In columns, from left to right: Regional (local) stages; Depositional units; Lithological log; Biostratigraphic sampling points: green - mollusc samples, blue - microfauna samples; Magnetic susceptibility (plotted on a logarithmic scale; black line - values for each sample, red line - averaged 3); Inclination; Declination; Interpreted polarity (black - normal, white - reversed). The Akchagylian - Apsheronian transition is drawn based on microfauna (lower limit) and macrofauna (upper limit). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 12 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 12. Magnetostratigraphy of the Hajigabul section. In columns from left to right: Regional stages; Depositional units; Lithological log; Biostratigraphic sampling points, where green points are mollusc samples and blue points - microfauna samples; Magnetic susceptibility (plotted on a logarithmic scale)); Inclination; Declination; Interpreted polarity. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 2 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 2. Lithostratigraphic subdivision of the Goychay section (A) and the Hajigabul section (B). Logs, general view and characteristic photos of each sedimentary unit.
Fig. 1 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 1. Location map of the Goychay and Hajigabul sections. Columns on the left: Global polarity time scale (Hilgen et al., 2012) Epoch/Age; Regional Stages: a* classical definition (Shantser, 1982; Arslanov et al., 1988; Nevesskaya et al., 2003, 2004), b* this study. Position of the studied sections in relation to the Caspian Sea (A) and to the Kura Basin (B) (The map base is taken from www.maps-for-free.com); Geological maps for the Goychay section (C) and the Hajigabul section (D) modified after Bairamov et al. (2008).
Fig. 13 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 13. Correlation of polarity patterns to the Global Polarity Time Scale (GPTS), the main paleoenvironmental events and characteristic mollusc fauna in the Goychay and Hajigabul sections. Sedimentation rate curves: Hajigabul section (A), the Goychay section (B).
Fig. 11 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 11. Equal area plots, Zijderveld diagrams and thermomagnetic curves for samples of the Hajigabul section. Equal are plots for: B. The low temperature component (20 oC-300 o C, LT_N): in situ and in tectonic coordinates (tc); E. All normal ChRM directions - in situ and in tectonic coordinates (tc); F. All reversed ChRM directions - in situ and in tectonic coordinates (tc); G. All mean directions for all reversed (MT_R and HT_R), all normal (HT_N and MT_N) and LT_N groups; L. Remagnetized samples marked as "Full overprint" (FO) - in situ and in tectonic coordinates (tc); A, C, H- Characteristic Zijderveld diagrams for various samples. D, M - thermomagnetic runs for various samples; Zijderveld diagrams with separate (H) and overlapped (I) demagnetization of two components. J - Zijderveld diagram given for one sample measured with different techniques: th - thermally demagnetized, af - demagnetized in alternating field.
Fig. 6 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 6. Equal area plots, Zijderveld diagrams and thermomagnetic curves for samples from the Goychay section. Equal area plots for: B. The low temperature component (20 o C-300 o C, LT_N): all LT_N direction in situ and in tectonic coordinates; C. Isolated group of LT_N directions; E. The medium temperature component with reversed directions (330 o C-400 oC, MT_R), in situ and in tectonic coordinates (tc); I. High temperature component (440 o C-580 o C (670 oC), HT_R) with reversed directions, in situ and in tectonic coordinates (tc); J. High temperaturecomponent (440 o C-580 o C (670 oC), HT_N) with normal directions, in situ and in tectonic coordinates (tc); N. All reversed direction (MT_R and HT_R) in tectonic coordinates; O. All mean directions for all reversed (MT_R and HT_R), LT_N and HT_N groups; A, D, G and H - characteristic Zijderveld diagrams; F, K, L and M - characteristic thermomagnetic runs for various samples.
Fig. 5. Selected gastropods from the Goychay section. A in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 5. Selected gastropods from the Goychay section. A. Theodoxus pallasi; B. Theodoxus pallasi; C. Laevicaspia sp. D. Laevicaspia subcaspia; E. Caspia apsheronica; F. Caspia sp.; G. Clessiniola cf. subvariabilis; H. Ecrobia cf. grimmi; I. Laevicaspia subcaspia; J. Melanopsis bergeroni; K. Lymnaea sp.; L. Turricaspia sp.; M. Laevicaspia sp.; N. Streptocerella sp.; O. Gyraulus sp.; P. Valvata sp. (Scale bars 1 mm).
Fig. 4 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 4. Selected bivalve species and charophyta from the Goychay section: A. Dreissena carinatocurva; B. Dreissena rostriformis; C. Dreissena polymorpha; D. Pseudocatillus sp.; E. Didacnomya sp.; F. Apscheronia propinqua; G. Corbicula fluminea (paired bivalve); H. Corbicula fluminea; I. Monodacna sp. 1; J. Monodacna sp. 1; K. Adacna sp; L. Oogonium of charophyta. (Scale bars 1 mm).
Fig. 10. Middle Pleistocene Didacna species from the Hajigabul section. Scale bar 5 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 10. Middle Pleistocene Didacna species from the Hajigabul section. Scale bar 5 mm. A-B. Didacna bergi (1954 m, early Khazarian); C-G. D. parvula (1795 m, Late Bakunian); H-I. D. cf carditoides (1795 m, Late Bakunian); J-K. Didacna sp (1795 m, Late Bakunian).
Fig. 9 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
Fig. 9. Mollusc fauna from the Akchagylian clay interval in the Hajigabul section. Scale bar 5 mm. (a). Cardiidae sp. A. (428 m); (b-d). Cardiidae sp. B. (395 m); (e-g). Cardiidae sp. (395 m); (h, i). Avicardium nikitini (395 m); ((i) is a reconstruction); (j) Pirenella caspia (288 m).
FIGURE 15 in Comparison of Miocene to early Pleistocene-aged Castor californicus (Rodentia: Castoridae) to extant beavers and implications for the evolution of Castor in North America
FIGURE 15. Comparison of the skull and dentary of extant Castor canadensis (MVZ 80744) and C. fiber (USNM 248154) to fossil C. californicus (USNM 26154). Note that the North American species C. canadensis and C. californicus share shorter nasals, wider occiput, and more posteriorly positioned orbits than Eurasian C. fiber; both also display more anterior placement of the anterior margin of the pterygoid insertion and greater spread of the posterior processes (coronoid, condylar, angular) than C. fiber.
FIGURE 14 in Comparison of Miocene to early Pleistocene-aged Castor californicus (Rodentia: Castoridae) to extant beavers and implications for the evolution of Castor in North America
FIGURE 14. Variation line graph calculated by coefficients of variation with sample size correction for Castor canadensis and C. californicus postcranial measurements. Note that C. fiber is excluded due to limited sampling. Castor canadensis and C. californicus both contains high levels of variation in postcranial elements. See Table 17 for descriptive statistics, coefficients of variation, and ANOVA results.
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