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FIG. 12 in A new species of Hoploscaphites (Ammonoidea: Ancyloceratina) from cold methane seeps in the Upper Cretaceous of the U.S. Western Interior

FIG. 12. Sutures of Hoploscaphites gilberti, n. sp., and H. gilli Cobban and Jeletzky, 1965. A. H. gilberti, n. sp., USNM 547302, macroconch, last suture, Baculites scotti Zone, Pierre Shale, USGS Mesozoic loc. D1509, Pueblo County, Colorado. B. H. gilberti, n. sp., USNM 547344, microconch, next to last suture, Baculites scotti Zone, Pierre Shale, USGS Mesozoic loc. D1362, Pueblo County, Colorado. C. H. gilli, USNM 547334, macroconch, third from last suture, Baculites gregoryensis Zone, Pierre Shale, USGS Mesozoic loc. D1900, Niobrara County, Wyoming. Abbreviations: x, tubercle; E, ventral lobe; E/L, first lateral saddle between ventral and lateral lobes; L, lateral lobe.

FIG. 4 in A new species of Hoploscaphites (Ammonoidea: Ancyloceratina) from cold methane seeps in the Upper Cretaceous of the U.S. Western Interior

FIG. 4. Size-frequency histogram of Hoploscaphites gilberti, n. sp., Pierre Shale, Baculites scotti–Didymoceras nebrascense zones, based on the samples in tables 1 and 2.

FIG. 3. Scaphite terminology. A in A new species of Hoploscaphites (Ammonoidea: Ancyloceratina) from cold methane seeps in the Upper Cretaceous of the U.S. Western Interior

FIG. 3. Scaphite terminology. A. Macroconch, right lateral view. The shell is oriented in the probable floating position when the body was withdrawn into the body chamber. The umbilical seam of the shaft in macroconchs is straight with a slight umbilical bulge. Abbreviations: HP = whorl height along the long axis; HS = whorl height at midshaft; HH = whorl height at the point of recurvature; LMAX = maximum length along the long axis; apt. <= apertural angle. B. Microconch, right lateral view. In Hoploscaphites gilberti, n. sp., the microconch is approximately 80% of the size of the macroconch or, inversely, the macroconch is approximately 125% the size of the microconch. The umbilical seam of the shaft in microconchs is curved and follows the curvature of the venter. Specimens are photographed from lateral, ventral, and apertural views, as shown. Asterisks indicate the up position in each view. C. Close-up of the umbilicus of the macroconch showing the umbilical diameter measured parallel to the long axis (UD). D. View of the venter of the body chamber at midshaft, with the adoral direction toward the top, showing the width of the venter (VS), as measured between the ventrolateral margins.

FIG. 1 in A new species of Hoploscaphites (Ammonoidea: Ancyloceratina) from cold methane seeps in the Upper Cretaceous of the U.S. Western Interior

FIG. 1. Map of the middle Campanian Baculites scotti Zone showing the shoreline along the western margin of the Western Interior Seaway (reproduced from Cobban et al., 1994). The numbered dots indicate USGS and AMNH localities cited in the text, as listed in the appendix.

FIG. 2 in A new species of Hoploscaphites (Ammonoidea: Ancyloceratina) from cold methane seeps in the Upper Cretaceous of the U.S. Western Interior

FIG. 2. Tepee buttes in the Pierre Shale of Colorado, Wyoming, and South Dakota. A. Tepee butte along the Front Range of Colorado, as illustrated by Gilbert (1896: pl. 67). B. Overview of tepee buttes at AMNH loc. 3494,Weston County,Wyoming. Photo by S. Klofak. C. Close-up of tepee butte at AMNH loc. 3494,Weston County, Wyoming. Photo by M. Garb. D. Close-up of tepee butte at AMNH loc. 3344, Butte County, South Dakota, with three of the authors for scale. Photo by B. Brown. E. Tepee butte near AMNH loc. 3344, Butte County, South Dakota. The shale surrounding the limestone core of the tepee butte has weathered away, exposing the core. Photo by B. Brown. F. Macroconch of Hoploscaphites gilberti, n. sp., AMNH loc. 3494, Weston County, Wyoming. Photo by M. Garb.

opencc-by-4.0Feb 2023View details →

Supplementary data to: Internal anatomy of brachyuran crab from a Late Cretaceous methane seep and an overview of internal soft tissues in fossil decapod crustaceans

001-Secretanella_sp_AAK_072019.zip - µCT scan data, 1.28 GB stack of DICOM images. High-resolution X-ray computed tomography (CT) scans of specimen ALMNH:Paleo:6522 were obtained at the Berkeley Preclinical Imaging Facility (UC Berkeley, California, USA) in July 2019 using a GE Healthcare eXplore Locus Micro CT Scanner. The specimen was scanned using a conebeam energy of 80 kV, a current of 450 µA, 2,000 ms exposure time, and no filter, resulting in a voxel resolution of 20.523 µm. Visualization and three-dimensional reconstruction of the resulting µCT data were performed using the open-source software 3D Slicer v.4.13.0 (Fedorov et al., 2012). Additional_images_gifs_3Dmodel.zip - archive containing 3 folders of additionnal images, video (gifs) and a 3D model (STL file) : - Addendum_Figure_3 : additional images / views to the figure 3 presented in the paper. - Gifs_3d_models : gifs and STL 3d model of the scanned specimen - Images_gifs_inc_gastric_musc : images, gifs and 3d model similar as in the other folders, but displaying potential gastric muscles

opencc-zeroJul 2020View details →

Amplicon sequence variants by sample table from Antarctic methane seeps

Antarctica is estimated to contain as much as a quarter of earth's marine methane, however we have not discovered an active Antarctic methane seep limiting our understanding of the methane cycle. In 2011, an expansive (70m x 1m) microbial mat formed at 10m water depth in the Ross Sea, Antarctica and we carried out 16S rRNA gene analysis on samples collected one year and five years after the methane seep formed. The data set attached is the resulting Amplicon Sequence Variant table by sample that we used to track the community composition change during this time and in comparison to other sampling in the McMurdo sound region.

opencc-by-4.0Dec 2023View details →

Figure 10 in A methane seep from the deep-marine, late Eocene Keasey Formation, Rock Creek, Columbia County, Oregon

Figure 10. Stratigraphic distribution of macrofaunal elements and associations.

opencc-by-4.0Dec 2023View details →

Table 1 in A methane seep from the deep-marine, late Eocene Keasey Formation, Rock Creek, Columbia County, Oregon

Table 1. Isotope standards used in rock analyses<table><tbody><tr><th>Standard</th><th>d 13 C (VPDB), &permil;</th><th>d 18 O (VPDB), &permil;</th><th>Mineral</th></tr></tbody><tbody><tr><th>NBS-18</th><td>-5.01 ± 0.03</td><td>-23.01 ± 0.22</td><td>Calcium carbonate</td></tr><tr><th>NBS-19</th><td>1.95 ± 0</td><td>-2.20 ± 0</td><td>Calcium carbonate</td></tr><tr><th>IRU-Marble</th><td>2.10 ± 0.06</td><td>-2.64 ± 0.09</td><td>Calcium carbonate</td></tr><tr><th>VPDBBB</th><td>1.37 ± 0.03</td><td>0.30 ± 0.06</td><td>Calcite</td></tr></tbody></table>

opencc-by-4.0Dec 2023View details →

Table 2 in A methane seep from the deep-marine, late Eocene Keasey Formation, Rock Creek, Columbia County, Oregon

Table 2. Isotope data from sediment samples and foraminifera. Foraminiferal samples are Globobulimina auriculata, G. pacifica, or Uvigerina cocoaensis.<table><tbody><tr><th>Carbonate sediment sample</th><th>Foraminifera taxon</th><th>δ 13 C % PDB</th><th>δ18O % PDB</th></tr></tbody><tbody><tr><th>RC9</th><td></td><td>5.44</td><td>3.81</td></tr><tr><th>RC10A</th><td></td><td>-45.18</td><td>12.85</td></tr><tr><th>RC10B</th><td></td><td>-30.37</td><td>-8.83</td></tr><tr><th>RC11</th><td></td><td>-40.25</td><td>-4.57</td></tr><tr><th>RC20</th><td></td><td>-13.08</td><td>-10.48</td></tr><tr><th>RC21</th><td></td><td>-54.66</td><td>-0.92</td></tr><tr><th>RC22</th><td></td><td>-43.41</td><td>-8.31</td></tr><tr><th>RC23</th><td></td><td>-48.47</td><td>-8.41</td></tr><tr><th>RC24</th><td></td><td>-45.38</td><td>-9.55</td></tr><tr><th>RC25B</th><td></td><td>-42.33</td><td>-8.94</td></tr><tr><th>RC26</th><td></td><td>-41.76</td><td>-8.56</td></tr><tr><th>RC27</th><td></td><td>-43.28</td><td>-9.04</td></tr><tr><th>WS1</th><td></td><td>-43.33</td><td>-7.18</td></tr><tr><th>WS2</th><td></td><td>-44.80</td><td>-6.66</td></tr><tr><th>WS3A</th><td></td><td>-46.96</td><td>-9.05</td></tr><tr><th>WS3B</th><td></td><td>-41.37</td><td>-6.51</td></tr><tr><th>W4</th><td></td><td>-52.48</td><td>-4.99</td></tr><tr><th></th><td>G. auriculata</td><td>-2.6</td><td>-2.8</td></tr><tr><th></th><td>G. auriculata</td><td>-17.7</td><td>0.6</td></tr><tr><th></th><td>G. auriculata</td><td>-5.8</td><td>-0.1</td></tr><tr><th></th><td>G. auriculata</td><td>-40.6</td><td>0.3</td></tr><tr><th></th><td>G. auriculata</td><td>-9.7</td><td>0.8</td></tr><tr><th></th><td>G. pacifica</td><td>-34.9</td><td>-1.5</td></tr><tr><th></th><td>G. pacifica</td><td>-46.0</td><td>0.7</td></tr><tr><th></th><td>G. pacifica</td><td>-45.9</td><td>0.3</td></tr><tr><th></th><td>G. pacifica</td><td>-4.4</td><td>-2.7</td></tr><tr><th></th><td>U. cocoaensis</td><td>0.2</td><td>0.4</td></tr><tr><th></th><td>U. cocoaensis</td><td>0.6</td><td>0.3</td></tr><tr><th></th><td>U. cocoaensis</td><td>0.3</td><td>0.4</td></tr><tr><th></th><td>U. cocoaensis</td><td>0.3</td><td>0.4</td></tr><tr><th></th><td>U. cocoaensis</td><td>-0.3</td><td>0.5</td></tr><tr><th></th><td>U. cocoaensis</td><td>-30.9</td><td>0.3</td></tr><tr><th></th><td>U. cocoaensis</td><td>-4.1</td><td>0.3</td></tr><tr><th></th><td>U. cocoaensis</td><td>0.4</td><td>0.5</td></tr><tr><th></th><td>U. cocoaensis</td><td>-1.2</td><td>0.5</td></tr><tr><th></th><td>U. cocoaensis</td><td>0.6</td><td>0.4</td></tr><tr><th></th><td>U. cocoaensis</td><td>-0.7</td><td>0.2</td></tr><tr><th></th><td>U. cocoaensis</td><td>0.1</td><td>0.3</td></tr><tr><th></th><td>U. cocoaensis</td><td>-0.7</td><td>0.0</td></tr><tr><th></th><td>U. cocoaensis</td><td>0.0</td><td>0.3</td></tr><tr><th></th><td>U. cocoaensis</td><td>-12.6</td><td>0.3</td></tr><tr><th></th><td>U. cocoaensis</td><td>-1.4</td><td>-1.6</td></tr><tr><th></th><td>U. cocoaensis</td><td>0.0</td><td>-1.1</td></tr><tr><th></th><td>U. cocoaensis</td><td>-0.1</td><td>0.2</td></tr><tr><th></th><td>U. cocoaensis</td><td>0.0</td><td>0.3</td></tr><tr><th></th><td>U. cocoaensis</td><td>-5.1</td><td>0.2</td></tr><tr><th></th><td>U. cocoaensis</td><td>-5.1</td><td>0.0</td></tr><tr><th></th><td>U. cocoaensis</td><td>-0.4</td><td>0.7</td></tr></tbody></table>

opencc-by-4.0Aug 2022View details →

Dataset of publication: Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph

This file contains all TEM (Transmission Electron Microscopy) images of the foraminifera N. labradorica (foraminifera) used in a feeding experiment for the publication DOI: https://doi.org/10.5194/bg-2021-284 Samples were collected at Gas Hydrate Pingo 3 (GHP3), app. 50 km south of Svalbard at 382m water depth at the mouth of Storfjordrenna, Barents Sea.  Blade corer (BLC18) used for sampling was taken at following location 76°6'23.7"N 15°58'1.7"E.     After sampling a feeding experiment was performed using the marine methanothroph Methyloprofundus sedimenti. More details can be fount in the methods paper. The file contains

opencc-zeroJun 2024View details →

Raised bogs are the key source of methane in West Siberia terrestrial seeps

The expansive plains of western Siberia contain globally significant carbon stocks, with the largest peatland complex in the world overlying the planet's largest known hydrocarbon basin. Numerous terrestrial methane seeps have been recently discovered on this landscape, located along the Ob and Irtysh River floodplains in hotspots covering more than 2,500 km2. The origin of methane from these seeps is a matter of both practical and academic interest. The release of even negligible portions of western Siberia's vast carbon pool will have global climate implications. We articulated three hypotheses to explain the origin and migration pathways of methane within these seeps: (H1) uplift of Cretaceous-aged methane from deep petroleum reservoirs along faults and fractures, (H2) release of Oligocene-aged methane capped or trapped by degrading permafrost, and (H3) horizontal migration of Holocene-aged methane from surrounding peatlands. We tested these hypotheses using a range of geochemical tools on gas and water samples extracted from seeps, peatlands, and aquifers across the 120,000 km2 study area. Seep-gas composition, radiocarbon age, and stable isotope fingerprints favor the peatland hypothesis of seep-methane origin. We identified the dominant metabolic pathways of mid Holocene-aged 14CH4, absent of oxidation, all the way from raised bogs to seeps along the floodplains of the Ob and Irtysh Rivers. Observed 13C-depletion of methane, along with concentration decreases between source and seeps, could be associated with mixing between two sources with different conditions for methane production: raised bogs with CO2 reduction methanogenesis and groundwater with acetate fermentation methanogenesis. Our findings highlight the importance of lateral migration between typical boreal landscapes via groundwater, implying intimate connections between them. Lateral migration may result in high methane emissions from groundwater-fed rivers of the region. These methane hotspots could be potentially overlooked in the West Siberia Lowlands and other bog-dominated regions.

opencc-by-4.0Nov 2011View details →

Fig. 6 in Catshark egg capsules from a Late Eocene deep-water methane-seep deposit in western Washington State, USA

Fig. 6. Pyrite framboids in the egg capsule wall. SEM image of an etched fracture surface.

opencc-by-4.0Nov 2011View details →

Fig. 4 in Catshark egg capsules from a Late Eocene deep-water methane-seep deposit in western Washington State, USA

Fig. 4. Raman spectra of globules and microsparitic matrix of the capsule wall.

publicJul 2020View details →

Amplicon sequence variants by sample table from Antarctic methane seeps

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publicJun 2024View details →

Raised bogs are the key source of methane in West Siberia terrestrial seeps

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opennotspecifiedJan 2020View details →

FIGURE 3 in Enigmaticolus inflatus sp. nov., a new buccinid species from a methane seep area in the South China Sea (Gastropoda: Neogastropoda)

FIGURE 3. Neighbour-joining tree for Enigmaticolus and related genera based on available COI sequences from this study and Gen- Bank. Numbers above branches indicate the bootstrap values. (MN102347 is the GenBank accession number for the COI sequence of Enigmaticolus inflatus sp. nov.)

opennotspecifiedJan 2020View details →

FIGURE 1 in Enigmaticolus inflatus sp. nov., a new buccinid species from a methane seep area in the South China Sea (Gastropoda: Neogastropoda)

FIGURE 1. Enigmaticolus inflatus sp. nov. A–C. holotype MBM 286512, 79.2 mm; D. paratype MBM 286513, 83.3 mm; E. Radula of holotype.

opennotspecifiedJan 2021View details →

FIGURE 14 in Laminatubus (Serpulidae, Annelida) from eastern Pacific hydrothermal vents and methane seeps, with description of two new species

FIGURE 14. SEM of Laminatubus joycebrooksae n. sp. (SIO-BIC A8256A). A—lateral view of a specimen without radiolar crown. B—close-up view of the thorax. C—collar chaetae. D—thoracic chaetae of the last thoracic chaetigerous segment. E—thoracic uncini. F—anterior abdominal true trumpet-shaped chaeta. G—anterior abdominal uncini.