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Scissurella nesbittae, new species, from the Gries Ranch Formation, Lewis County Washington State (Gastropoda: Vetigastropoda: Scissurellidae)
No full textGeiger, Daniel L., Goedert, James L. (2020): Scissurella nesbittae, new species, from the Gries Ranch Formation, Lewis County Washington State (Gastropoda: Vetigastropoda: Scissurellidae). Zootaxa 4759 (4): 593-596, DOI: 10.11646/zootaxa.4759.4.1
Scissurellidae Gray 1847
No full textScissurellidae Gray, 1847 Scissurella d‘Orbigny, 1824 Type species. Scissurella laevigata d‘Orbigny, 1824 (subsequent designation Gray 1847).Published as part of Geiger, Daniel L. & Goedert, James L., 2020, Scissurella nesbittae, new species, from the Gries Ranch Formation, Lewis County Washington State (Gastropoda: Vetigastropoda: Scissurellidae), pp. 593-596 in Zootaxa 4759 (4) on page 593, DOI: 10.11646/zootaxa.4759.4.11, http://zenodo.org/record/374099
Worm tubes in an allochthonous cold-seep carbonate from lower Oligocene rocks of western Washington
No full textTubes suspected to be those of vestimentiferan worms are abundant in carbonate boulders at one locality in the lower Oligocene part of the Lincoln Creek Formation along the Canyon River, Grays Harbor County, Washington. The largest tubes exhibit the same general orientation and are arranged in clusters. The tube walls are preserved as aragonite that is, in some cases, replaced by silica. The original tube walls either had a high carbonate content or were indurated very early by aragonite mineralization of the organic wall. The carbonate cements around, on, and inside of the tubes were precipitated due to the microbial oxidation of hydrocarbons at a cold-seep. After lithification, the carbonate fragmented as it slid or slumped, along with other sedimentary debris, downslope into deeper waters. This is one of the few reports of an ancient cold-seep chemosynthetic community dominated by tube worms, and the third report of an allochthonous cold-seep carbonate within a deep-water depositional setting
Orbitestella Iredale 1917
No full textGenus Orbitestella Iredale, 1917 Type species. Cyclostrema bastowi Gatliff, 1906, by monotypy, Recent, Victoria, southeast Australia.Published as part of Chernyshev, Alexei V. & Goedert, James L., 2021, New species of latest Eocene / earliest Oligocene microgastropods (Heterobranchia Orbitestellidae and Omalogyridae) from the Gries Ranch Formation, Lewis County, Washington State, USA, pp. 469-480 in Zootaxa 4981 (3) on page 471, DOI: 10.11646/zootaxa.4981.3.3, http://zenodo.org/record/492113
FIGURE 1 in New species of latest Eocene/earliest Oligocene microgastropods (Heterobranchia Orbitestellidae and Omalogyridae) from the Gries Ranch Formation, Lewis County, Washington State, USA
No full textFIGURE 1. Orbitestella palaiopacifica Squires & Goedert (SEM). A, specimen MIMB 41133–1, apical view; B, specimen MIMB 41133–2, umbilical view; C, specimen MIMB 41133–3, apertural view. Scales: 100 µm.Published as part of Chernyshev, Alexei V. & Goedert, James L., 2021, New species of latest Eocene/earliest Oligocene microgastropods (Heterobranchia Orbitestellidae and Omalogyridae) from the Gries Ranch Formation, Lewis County, Washington State, USA, pp. 469-480 in Zootaxa 4981 (3) on page 472, DOI: 10.11646/zootaxa.4981.3.3, http://zenodo.org/record/492113
Ammonicera Vayssiere 1893
No full textGenus <i>Ammonicera</i> Vayssière, 1893 <p> <b>Type species.</b> <i>Homalogyra fischeriana</i> Monterosato, 1869, by monotypy, Recent, Atlantic Ocean.</p>Published as part of <i>Chernyshev, Alexei V. & Goedert, James L., 2021, New species of latest Eocene / earliest Oligocene microgastropods (Heterobranchia Orbitestellidae and Omalogyridae) from the Gries Ranch Formation, Lewis County, Washington State, USA, pp. 469-480 in Zootaxa 4981 (3)</i> on page 474, DOI: 10.11646/zootaxa.4981.3.3, <a href="http://zenodo.org/record/4921137">http://zenodo.org/record/4921137</a>
Oxygen and carbon stable isotope analysis of samples from the Columbia River
No full textOxygen and carbon stable isotope analysis of samples from the Columbia Rive
Osedax borings in fossil marine bird bones
Full text linkThe bone-eating marine annelid Osedax consumes mainly whale bones on the deep-sea floor, but recent colonization experiments with cow bones and molecular age estimates suggesting a possible Cretaceous origin of Osedax indicate that this worm might be able grow on a wider range of substrates. The suggested Cretaceous origin was thought to imply that Osedax could colonize marine reptile or fish bones, but there is currently no evidence that Osedax consumes bones other than those of mammals. We provide the first evidence that Osedax was, and most likely still is, able to consume non-mammalian bones, namely bird bones. Borings resembling those produced by living Osedax were found in bones of early Oligocene marine flightless diving birds (family Plotopteridae). The species that produced these boreholes had a branching filiform root that grew to a length of at least 3 mm, and lived in densities of up to 40 individuals per square centimeter. The inclusion of bird bones into the diet of Osedax has interesting implications for the recent suggestion of a Cretaceous origin of this worm because marine birds have existed continuously since the Cretaceous. Bird bones could have enabled this worm to survive times in the Earth's history when large marine vertebrates other than fish were rare, specifically after the disappearance of large marine reptiles at the end-Cretaceous mass extinction event and before the rise of whales in the Eocene.Deutsche Forschungsgemeinschaft [Ki 802/6-1
Traces of the bone-eating annelid Osedax in Oligocene whale teeth and fish bones
Full text linkThe range of substrates that the bone-eating marine worm Osedax is able to consume has important implications for its evolutionary history, especially its potential link to the rise of whales. Once considered a whale specialist, recent work indicates that Osedax consumes a wide range of vertebrate remains, including whale soft tissue and the bones of mammals, birds and fishes. Traces resembling those produced by living Osedax have now been recognized for the first time in Oligocene whale teeth and fish bones from deep-water strata of the Makah, Pysht and Lincoln Creek formations in western Washington State, USA. The specimens were acid etched from concretions, and details of the borehole morphology were investigated using micro-computed tomography. Together with previously published Osedax traces from this area, our results show that by Oligocene time Osedax was able to colonize the same range of vertebrate remains that it consumes today and had a similar diversity of root morphologies. This supports the view that a generalist ability to exploit vertebrate bones may be an ancestral trait of Osedax
X-ray µ-CT data reconstruction, image stack of sample NRM M8681
No full textThis contribution comprises a true-3D volume dataset (Digital rock sample) of a fossilized whale ear bone material from Oligocene strata in Washington State, USA, acquired by a X-ray Computed Microtomography (µ-CT) survey (Kiel et al., submitted). The specimen is curated in the paleontological collection of the Swedish Museum of Natural History, Stockholm, Sweden. The X-ray μ-CT scan was performed using the CT-ALPHA system of the MAPEX Center for Materials and Processes at the University of Bremen, Germany. The reconstructed image material has a resolution of 46.8 µm/voxel.
Sample NRM M8681 shows bioerosion traces typical of Osedax on its surface and contains an ear bone of a whale (Mysticeti, genus and species undetermined). The piece was found as float, Canyon River, Lincoln Creek Formation, probably late Oligocene (could be from older strata farther upstream and downsection), Grays Harbor County, Washington.
The µ-CT-derived image volume comprises the true 3-D spatial arrangement of the fabric compounds in the rock. In the reconstructed 16-bit greyscale volume data, areas of highly attenuating phases (e.g., calcite) are encoded in light grey values, whereas areas of lower X-ray absorption are color-coded in darker grey (e.g. sediment) or black (e.g. voids, cracks). In order to facilitate straightforward access to the digital image material, the volume data is provided as a zipped stack of tif images. In addition, the digital rock sample is characterized by three types of visualization: (i) shaded and classical texture-based volume rendering (volren), (ii) maximum intensity projection (volren-MIP): visualization of the highest intensity in the data volume along the current line of sight, and (iii) three perpendicular virtual cutting planes (3-slices).
As an added value to the non-destructive visualization procedure, the reconstructed X-ray micro-CT scan of the studied rock material represents a volume reconstruction which may be studied as digital facsimile (e. g., for investigations regarding morphometric analyses of bioerosion traces) without the necessity of consultation / modification / destructive handling of the actual specimen
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