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obrution beds

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Journal Article
Journal: PALAIOS
Published: 16 April 2019
PALAIOS (2019) 34 (4): 212-228.
... window into the structure of Early Devonian, echinoderm-dominated communities within the Malvinokaffric Realm of SW Gondwana. Micro-CT scanning and 3D modeling of a portion of an obrution bed revealed an assemblage of over 700 ophiuroids observed of the newly described Gamiroaster tempestatis Reid 2019...
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A ) Location of the Karbonaatjies <b>obrution</b> <b>bed</b> within the outcrop (indicate...
in > PALAIOS
Published: 16 April 2019
Fig. 2.— A ) Location of the Karbonaatjies obrution bed within the outcrop (indicated by yellow arrows). B ) Top surface of the fossiliferous bed with interference ripple marks. C ) Excavated section of the Karbonaatjies obrution bed. Each individual rock fragment was given a reference letter
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Ophiuroid articulation categories in the Karbonaatjies <b>obrution</b> <b>bed</b>.  A ,  ...
in > PALAIOS
Published: 16 April 2019
Fig. 3.— Ophiuroid articulation categories in the Karbonaatjies obrution bed. A , B ) Group 1: well-preserved ophiuroids with fully articulated arms, ophiuroid specimen (sample UU) preserved with delicate arm tips. C , D ) Group 2: partially disarticulated ophiuroids having only median
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Stylophoran articulation categories in the Karbonaatjies <b>obrution</b> <b>bed</b>.  A ,...
in > PALAIOS
Published: 16 April 2019
Fig. 4.— Stylophoran articulation categories in the Karbonaatjies obrution bed. A , B , F – H ) Group 1: distal and proximal part of aulacophore preserved, complete to slightly disarticulated theca, digits preserved (only applicable to Placocystella). (A) specimen with stretched out
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Virtual reconstruction of the Karbonaatjies <b>obrution</b> <b>bed</b> shows over 700 art...
in > PALAIOS
Published: 16 April 2019
Fig. 6.— Virtual reconstruction of the Karbonaatjies obrution bed shows over 700 articulated ophiuroids (light pink = ophiuroids oral side down; dark pink = ophiuroids oral side up); 145 Paranacystis cf. petrii Caster, 1954 (green); eight Placocystella africana ( Reed 1925 ) (red
Image
Ophiuroid arm arrangement in Karbonaatjies <b>obrution</b> <b>bed</b>.  A ) Most ophiuroi...
in > PALAIOS
Published: 16 April 2019
Fig. 9.— Ophiuroid arm arrangement in Karbonaatjies obrution bed. A ) Most ophiuroids in resting postures have equally spaced arms that are extended more or less straight. B ) Few ophiuroids display irregular postures with equally spaced arms (marked by an arrow). C ) Ophiuroid arms arranged
Journal Article
Journal: PALAIOS
Published: 01 May 2012
PALAIOS (2012) 27 (5): 326-345.
... conservation Lagerstätten, such as the Beecher Beds, in which soft part preservation reveals truly extraordinary conditions. Rather we have concentrated on a distinctive subset of trilobite beds that represent diagenetically enhanced obrution deposits ( Seilacher, 1982 ; Brett and Seilacher, 1991 ) that occur...
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Journal Article
Journal: Paleobiology
Published: 14 October 2013
Paleobiology (2013) 40 (1): 50-69.
... sequence divided into ten stratigraphic intervals. Each interval represents an induced time-averaged assemblage of various event (obrution) beds of unknown duration. Overall, the different fossil assemblages are taxonomically and ecologically similar, suggesting the presence of a single community type...
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Journal Article
Journal: PALAIOS
Published: 01 June 2001
PALAIOS (2001) 16 (3): 197-204.
..., together with their common occurrence at the base of cm-scale graded beds, helicoplacoids most likely were preserved during obrution events. A majority (69%) of helicoplacoid specimens are partially disarticulated, probably indicating that most helicoplacoids underwent some combination of pre-burial...
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Journal Article
Journal: PALAIOS
Published: 01 March 2017
PALAIOS (2017) 32 (3): 166-180.
.... The Lagerstätte represents an autochthonous community composed of a single siltstone bed representing an obrution event and containing over 400 individual glyptocrinids that had colonized a slight topographic rise of relatively high energy within the deep subtidal zone. The high density of the crinoid community...
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FIGURE 4 —Types of sedimentological shell <b>beds</b> and echinoderm <b>obrution</b> depo...
in > PALAIOS
Published: 01 August 2001
FIGURE 4 —Types of sedimentological shell beds and echinoderm obrution deposits. (A–C) Densely packed sedimentological accumulations from the Qm 1 of the Arda section (shell bed Type 3a). (A) Shell bed (sample M5b) characterized by the abundant remains of Corbula gibba , forming the base
Journal Article
Journal: PALAIOS
Published: 01 August 2010
PALAIOS (2010) 25 (8): 487-506.
... Gaojiashan fossils, particularly the pyritized Conotubus and Gaojiashania fossils, are preserved in normally graded calcisiltite-siltstone beds interpreted as event deposits, the most parsimonious biostratinomic interpretation is that event deposition provided a smothering and obrution mechanism...
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Journal Article
Journal: PALAIOS
Published: 01 October 2006
PALAIOS (2006) 21 (5): 451-465.
... these issues, variation in fossil preservation was analyzed through a vertical succession of 26 bed assemblages, each representing a single obrution event, within the 7-m-thick Greater Phyllopod Bed of the Walcott Quarry. More than 50,000 specimens belonging to 158 genera—mostly benthic, monospecific...
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Fig. 10.   Single-layer shell pavements. Like <b>obrution</b> deposits, pavements ...
Published: 26 March 2008
Fig. 10. Single-layer shell pavements. Like obrution deposits, pavements tend to occur between event deposits in otherwise barren mudrock successions, suggesting sudden burial. (A) bedding plane view of hand sample from Hume at 29.76 m (see Miller et al. 2001 ), Brent submember. (B) Marion
Journal Article
Journal: PALAIOS
Published: 01 September 2009
PALAIOS (2009) 24 (9): 578-590.
... lying flat on the bed surface have moats but no rotational tracks. Inclined shells are associated with deeper burial by obrution events and a greater arc of rotation. The moat shape is inconsistent with differential compaction. The precise association between moats and commissures and the independence...
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Journal Article
Journal: PALAIOS
Published: 01 August 2001
PALAIOS (2001) 16 (4): 336-353.
...FIGURE 4 —Types of sedimentological shell beds and echinoderm obrution deposits. (A–C) Densely packed sedimentological accumulations from the Qm 1 of the Arda section (shell bed Type 3a). (A) Shell bed (sample M5b) characterized by the abundant remains of Corbula gibba , forming the base...
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Journal Article
Published: 01 March 1999
Journal of Paleontology (1999) 73 (2): 288-305.
... of the trilobite layers. Nearly half of the beds surveyed (n = 50) yield direct evidence of obrution (i.e., rapid post-mortem or live burial) of benthic organisms. Unusual anaerobic microenvironments in partially enrolled trilobites of the Ceraurus layer facilitated very early calcification of appendages and other...
Series: GSA Special Papers
Published: 01 January 2008
DOI: 10.1130/2008.2435(02)
... from other Cenozoic lake deposits formed in environments comparable to the Floris-sant Formation. The deposits include the Oligocene shale at Canyon Ferry, Montana; the Miocene Savage Canyon Formation, Stewart Valley, Nevada; and the Miocene Shanwang Beds of Shandong Province in northeast China...
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Journal Article
Journal: PALAIOS
Published: 01 June 2008
PALAIOS (2008) 23 (6): 391-401.
.... Marine palynomorphs, sulfide contents, and δ 34 S values of pyrite sulfur indicate normal to near-normal marine salinities. Environmental factors and sedimentary processes contributing to preservation of the Ingersoll shale biota include (1) rapid deposition and burial (obrution); (2) reducing pore...
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Journal Article
Published: 01 May 2010
Journal of Paleontology (2010) 84 (3): 493-504.
...XUE-JIAN ZHU; NIGEL C. HUGHES; SHAN-CHI PENG Abstract Articulated meraspid and holaspid exoskeletons of Guangxiaspis guangxiensis from the Guole Township, Jingxi County, Guangxi Province, China, are preserved in mudstone deposited during an obrution event. The species has a short dorsal pre...
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