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65 results for “North Greenland”
Mapping of the calving front of Heilprin Glacier, North West Greenland, by UAV photogrammetry
<p>These data contain photogrammetrical data collected by unmanned aerial vehicle (UAV) in July 2017 in the Inglefield Bredning. The data include processed data (orthoimage and digital elevation models) with the Structure-fom-Motion photogrammetrical software Agisoft Photoscan.</p> <p>Data are organized by glacier surveys with the following convention GLACIER_YYYYMMDD_HHMM. For instance : heilprin_20170705_1914 contains the Data of the survey of Heilprin glacier that started on July 5, 2017 at 19:14 UTC time.</p> <p>Coordinate system used is UTM Zone 19N based on WGS84</p> <p>Take-off and landing site lattitude and longitude was ( 77.497424 , -66.678433 )</p> <p>The data are related to the article "High-endurance UAV for monitoring calving glaciers: Application to the Inglefield Bredning and Eqip Sermia, Greenland", G. Jouvet, Y. Weidmann, E. van Dongen, M. Lüthi, A. Vieli, J. Ryan, Frontiers in Earth Sciences</p>
Mapping of the calving front of Tracy Glacier, North West Greenland, by UAV photogrammetry
<p>These data contain photogrammetrical data collected by unmanned aerial vehicle (UAV) in July 2017 in the Inglefield Bredning. The data include processed data (orthoimage and digital elevation models) with the Structure-fom-Motion photogrammetrical software Agisoft Photoscan.</p> <p>Data are organized by glacier surveys with the following convention GLACIER_YYYYMMDD_HHMM. For instance : tracy_20170705_1914 contains the Data of the survey of Tracy glacier that started on July 5, 2017 at 19:14 UTC time.</p> <p>Coordinate system used is UTM Zone 19N based on WGS84</p> <p>Take-off and landing site lattitude and longitude was ( 77.497424 , -66.678433 )</p> <p>The data are related to the article "High-endurance UAV for monitoring calving glaciers: Application to the Inglefield Bredning and Eqip Sermia, Greenland", G. Jouvet, Y. Weidmann, E. van Dongen, M. Lüthi, A. Vieli, J. Ryan, Frontiers in Earth Sciences</p>
Data from: Late Ordovician and Early Silurian virgianid and stricklandioid brachiopods from North Greenland: Implications for a warm-water faunal province
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Data from: The palaeobiological significance of clustering in acritarchs: a case study from the early Cambrian of North Greenland
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Data from: Morphometric analysis of Skiagia-plexus acritarchs from the early Cambrian of North Greenland
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Data from: Small Carbonaceous Fossils (SCFs) from North Greenland: new light on metazoan diversity in early Cambrian shelf environments
<p>The Sirius Passet <i>Lagerstätte</i> of North Greenland provides one of the oldest records of soft-bodied metazoan-dominated ecosystems from within the early Cambrian. The <i>Lagerstätte</i> site itself is restricted to just a single ~1 km-long outcrop located offshore from the shelf margin, in an area that has been affected by metamorphic alteration during the Ellesmerian Orogeny (Devonian–Early Carboniferous). The recent recovery of Small Carbonaceous Fossils (SCFs) to the south in areas that have escaped the effects of this deformation has substantially expanded the known coverage of organic preservation into shallower-water depositional settings in this region. Here we describe additional SCF assemblages from the siliciclastic shelf succession of the Buen Formation (Cambrian Series 2, Stages 3-4; ∼ 515 Ma), expanding upon the previously documented SCF biota. Newly recovered material reveals a rich diversity of non-mineralizing metazoans, chiefly represented by arthropod remains. These include the filtering and grinding elements of a sophisticated crustacean feeding apparatus - the oldest crustacean remains reported to date - alongside an assortment of bradoriid sclerites, including almost complete, three-dimensional valves which tie-together a number of SCFs previously found in isolation. Other metazoan remains include various trilobite cuticles, diverse scalidophoran sclerites, and a range of metazoan fragments of uncertain affinities. This shallower-water assemblage differs substantially from the Sirius Passet biota, which is dominated by problematic euarthropod stem-group members and sponges. Though some of these discrepancies are attributable to taphonomic or temporal factors, these lateral variations in taxonomic composition also point to significant palaeoenvironmental and/or palaeoecological controls on early Cambrian metazoan communities.</p>
Figure 14 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 14. Potential gut traces of Kiisortoqia soperi gen. et sp. nov., all specimens in dorsal aspect. A, MGUH 28957, showing continuous trace between segmentally arranged hollows. B, MGUH 28968, close-up of posterior part of trunk and tail shield, showing hollow trace with transverse annulation. C, MGUH 28961, close-up of posterior part of trunk, showing a three-dimensionally preserved continuous trace with transverse annulation.
Figure 13 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 13. Details of axial features of Kiisortoqia soperi gen. et sp. nov. A, MGUH 28955, dorsal aspect, close-up of anterior part of trunk and posterior part of head shield (left), showing putative muscle tissue in association with transverse hollows; B, MGUH 28966, ventral aspect, close-up of middle part of trunk, showing corrugated surface with transverse interruptions, the arrows point to exsagittal mineralizations. C, MGUH 28959, dorsal aspect, showing segmentally arranged, putative midgut diverticulae, the radial orientation of planar elements is seen in the anterior two trunk segments, and the sagittal orientation is seen in the posterior trunk segments. D, MGUH 28944, dorsal aspect, showing hollows after segmentally arranged axial mineralizations.
Figure 12 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 12. Details of axial features of Kiisortoqia soperi gen. et sp. nov. A, MGUH 28948, specimen in ventral aspect, close-up of posterior part of axial features, the smooth structures on top of the three-dimensional mineralizations may represent sternites. B, MGUH 28958, ventral aspect, showing transverse bars adjacent to anterior border of tergites. C, MGUH 28965, ventral aspect, showing transverse bars composed of at least two strands adjacent to anterior border of tergites. D, MGUH 28943, dorsal aspect, close-up of anterior part of trunk axis, showing transverse hollows in axial mineralizations. E, MGUH 28946, close-up of axis, ventral aspect, showing transverse bars and continuous patch of corrugated surface that may represent fossilized muscle tissue, the arrow marks the exopod setae.
Figure 11 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 11. Details of the postantennular limbs of Kiisortoqia soperi gen. et sp. nov. A, MGUH 28950, showing the shape and size of the anterior exopods, the endopod of the third postantennular limb is covered by the exopod of the second. B, MGUH 28967, posterior part of trunk, the exopods are made visible by the marginal setae (arrows). C, MGUH 28952, posterior part of trunk, the exopods are made visible by the marginal setae (arrows) imprinted in tergites. D, MGUH 28969, showing the articulation of the exopod along the slanting lateral edge of the basipod (arrows), the joint between the basipod and the first endopod podomere is seen by a sharp fold, and the exopod is probably represented by the smooth area, with the setae probably being imprints of setae belonging to the exopod of the next anterior (left) limb. Abbreviations: app1 en, endopod of first postantennular appendage; app1 ex, exopod of first postantennular appendage; app2 en, endopod of second postantennular appendage; app2 ex, exopod of second postantennular appendage; app3 en, endopod of third postantennular appendage; asr, anterior spine row of basipod; en1, first podomere of endopod; exs, exopod setae; psr, posterior spine row of basipod.
Figure 9 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 9. Details of the postantennular limbs of Kiisortoqia soperi gen. et sp. nov. A, close-up of MGUH 28946, showing endopods, exopod setae, and basipod spines (see Fig. 8B for an interpretative line drawing), the first postantennular limb is only marked by the basipod armature, arrows point to bulges that may represent the limbs of the opposing limb series folded under the axis. B, close-up of the postantennular limbs of MGUH 28942, arrows mark joints between the podomeres of the endopod. C, MGUH 28956, close-up of distal parts of endopods, showing the distal (ninth) podomere, which is a stout spine (arrows). Abbreviations: ant, antennula; app1-3 bas, basipods of first to third postantennular appendages; app1 ex, exopod of first postantennular appendage; app2 en, endopod of second postantennular appendage; cs, cephalic shield; en1–9, first to ninth podomere of the endopod; exs, exopod setae; tg1, first trunk tergite; tg2, second trunk.
Figure 10 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 10. Details of the postantennular limbs of Kiisortoqia soperi gen. et sp. nov. A, MGUH 28946, overview of an almost complete specimen, showing the length of the postantennular limbs and basipod spines. B, interpretative line drawing of anterior part of MGUH 28946, the endopod podomeres could only be traced on the actual specimen under oblique light from varying angles, see also Fig. 10A. C, MGUH 28949, basipod spines (arrow) point posteriorly (left). D, MGUH 28951, specimen in horizontal entombment, appendages are flipped anteriorly, as indicated by basipod spines. Abbreviations: ant, antennula; app1 ex, exopod of first postantennular appendage; app2 en, endopod of second postantennular appendage; app3 en, endopod of third postantennular appendage; bas spn, spines on the median edge of the basipod; cs, cephalic shield; en, endopod; exs, exopod setae; tg1, first trunk tergite; tg2, second trunk tergite; tg15, fifteenth trunk tergite; tg16, sixteenth trunk tergite; ts, tail shield.
Figure 8 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 8. Details of the postantennular limbs of Kiisortoqia soperi gen. et sp. nov. A, MGUH 28947, showing shape of basipod and first podomere, the arrows mark exsagittal mineralizations. B, drawing of MGUH 28947. C, MGUH 28945, showing sclerotized ridges in the arthrodial membrane between body and basipod (arrows). D, MGUH 28959, showing posteriorly directed basipod spines. Abbreviations: bas, basipod; bas spn, spines on the median edge of the basipod; cs, cephalic shield; en1, first podomere of endopod; en2, second podomere of endopod; tg1, first trunk tergite; tg2, second trunk tergite.
Figure 7 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 7. Details of the antennula of Kiisortoqia soperi gen. et sp. nov. A, MGUH 28948, the most completely preserved antennula, showing medial spines. B, drawing of MGUH 28948. C, MGUH 28953, showing pivot joints between articles (arrows). D, MGUH 28960, antennula rotated, showing peduncle and concave median surface of articles, arrows mark spines. E, MGUH 28954, showing widely spaced double rows of spines (arrows). Abbreviations: ant, antennula; app1 ex, exopod of first postantennular appendage; app2 en, endopod of second postantennular appendage; app2 ex, exopod of second postantennular appendage; cs, cephalic shield; ped, peduncle; tg1, first trunk tergite.
Figure 3 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 3. Statistics of selected morphometrics, based on 69 specimens that could be measured. A, size–frequency histogram based on the total length of the specimens. B, plot of length of the head shield against total length.
Figure 6 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 6. Kiisortoqia soperi gen. et sp. nov., posterior part of trunk and tail shield. A, MGUH 28966, parts of the exopods are represented by the margins with setae, and arrows mark the exsagittal mineralizations. B, drawing of MGUH 28966, exopods indicate that the posterior limbs were flipped backwards at the time of burial. C, MGUH 28962, in the posterior part of the trunk, an elongate hollowed-out structure potentially marks the position of the gut (gut?). D, drawing of MGUH 28962. Abbreviations: tg15, fifteenth trunk tergite; tg16, sixteenth trunk tergite; ts, tail shield.
Figure 5 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 5. Kiisortoqia soperi gen. et sp. nov. A, MGUH 28963, oblique entombment, showing the length of the limbs. B, MGUH 28964, horizontal entombent, showing the length of the antennula. C, drawing of MGUH 28964. Abbreviations: ant, antennula; app1 ex, exopod of first postantennular appendage; app2 ex, exopod of second postantennular appendage; bas spn, spines on the median edge of the basipod; cs, cephalic shield; en, endopod; tg1, first trunk tergite; tg2, second trunk tergite; tg15, fifteenth trunk tergite; tg16, sixteenth trunk tergite; ts, tail shield.
Figure 2 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 2. Schematic model of the predominant oblique mode of entombment of Kiisortoqia soperi gen. et sp. nov. One limb series is extended under the tergopleurae, whereas the other is folded under the axis. A, ventral view. B, frontal view.
Figure 4 in A new arthropod from the Early Cambrian of North Greenland, with a 'great appendage'-like antennula
Figure 4. Holotype of Kiisortoqia soperi gen. et sp. nov. A, MGUH 28942, arrows mark exsagittal mineralizations. B, drawing of MGUH 28942, heavy lines indicate non-biological features, such as cracks. Abbreviations: ant, antennula; app1 ex, exopod of first postantennular appendage; app2 en, endopod of second postantennular appendage; app2 ex, exopod of second postantennular appendage; bas spn, spines on the median edge of the basipod; cs, cephalic shield; gud, gut diverticulae; tg1, first trunk tergite; tg2, second trunk tergite; tg15, fifteenth trunk tergite; tg16, sixteenth trunk tergite; ts, tail shield.
Distribution. Arctic Ocean: Canada, USA (Alaska), Greenland, Norway (Svalbard), Russia. Have been sighted within 0-5° of North Pole. in Ursidae
Distribution. Arctic Ocean: Canada, USA (Alaska), Greenland, Norway (Svalbard), Russia. Have been sighted within 0-5° of North Pole.
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