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Conotubus

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Journal Article
Published: 09 January 2017
Geological Magazine (2017) 154 (6): 1294-1305.
... Kuanchuanpu Formation, southern Shaanxi Province, South China. This newly discovered fossil is a conical tube with a ‘funnel-in-funnel’ construction, showing profound morphological similarities to Cloudina and Conotubus . On the other hand, the outer few layers, and particularly the outermost layer...
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Journal Article
Journal: Geology
Published: 01 November 2016
Geology (2016) 44 (11): 911-914.
... Wutubus annularis interbedded with Cloudina shell beds. The upper of the two fossil horizons, in the Esmeralda Member of the Deep Spring Formation, contains Conotubus and occurs within the basal Cambrian negative carbon isotope excursion, establishing it as the youngest Ediacaran fossil assemblage...
Journal Article
Journal: PALAIOS
Published: 01 August 2010
PALAIOS (2010) 25 (8): 487-506.
...YAOPING CAI; HONG HUA; SHUHAI XIAO; JAMES D. SCHIFFBAUER; PENG LI Abstract The upper Ediacaran Gaojiashan Lagerstätte (551–541 Ma) in southern Shaanxi Province, South China, hosts a variety of soft-bodied or lightly biomineralized tubular fossils ( Shaanxilithes , Conotubus , Gaojiashania...
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Image
Figure 11. A schematic diagram showing the depositional setting of the midd...
in > PALAIOS
Published: 01 August 2010
Figure 11. A schematic diagram showing the depositional setting of the middle Gaojiashan Member at the Gaojiashan section, emphasizing the importance of event deposition (gray plume) as an obrution mechanism. A) An erect Conotubus organism (left) is buried obliquely, with its annulations inclined
Image
Figure 4. Reflected light photomicrographs (except K, M, N) of representati...
in > PALAIOS
Published: 01 August 2010
, lower Gaojiashan Member. B) Pyritized Conotubus tubes. C) Internal mold of Conotubus tube with faint carbonaceous film on the surface. D) Glauconitized Conotubus tube (dark green color). E–F) Polished transverse cross sections of pyritized Conotubus tubes, showing transverse profiles of slightly
Image
Figure 8. Preferential occurrence of pyritized tubular fossils in calcisilt...
in > PALAIOS
Published: 01 August 2010
-mudstone ( = black arrows). Note Conotubus tubes preserved in calcisiltite and oriented obliquely to bedding planes. B) Cluster of pyritized Conotubus tubes preserved in silty sediments, showing no preferred orientation. Note an isolated quartz grain ( = arrow). C) A partly exposed fossiliferous
Image
Figure 9. Representative fossils from taphofacies A in the middle Gaojiasha...
in > PALAIOS
Published: 01 August 2010
Figure 9. Representative fossils from taphofacies A in the middle Gaojiashan Member at the Gaojiashan section. A) Cluster of Conotubus tubes. Note random orientation and little fragmentation. B) Protolagena tests (circled) preserved in a calcisiltite bed. C–E) An extracted Conotubus tube
Image
Figure 10. Representative fossils from taphofacies B in the middle Gaojiash...
in > PALAIOS
Published: 01 August 2010
Figure 10. Representative fossils from taphofacies B in the middle Gaojiashan Member at the Gaojiashan section. A) A partly fragmented Conotubus tube. Note fragmentation at the apertural end and near the apical end ( = arrow). B) Strongly fragmented Conotubus tubes. Annulations
Image
(a) Ediacaran and Cambrian stratigraphy of South China. Ediacaran chemostra...
Published: 01 November 2017
, a characteristic Ediacara organism (image courtesy of Z. Chen); fossil image of the Gaojiashan biota is Conotubus , a large tubular animal (image courtesy of Y. Cai); fossil images of the Meishucun fauna are Anabarites trisulcatus and Protohertzina anabarica ; fossil image of the Kuanchuanpu fauna
Journal Article
Journal: Geology
Published: 01 November 2016
Geology (2016) 44 (11): 975-976.
... contribution to the timing of the large end-Ediacaran carbon isotope excursion, with direct reference to the occurrence of (1) Cloudina - and Conotubus -bearing tubular fossil assemblages, known as index fossils for the last ∼10 m.y. of the Ediacaran ( Cai et al., 2010 ; Cortijo et al., 2015 ; Grant, 1990...
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Journal Article
Published: 01 July 2009
Journal of Paleontology (2009) 83 (4): 630-633.
... as Sinocyclocyclicus guizhouensis because it co-occurs with circular cross-sections of a comparable diameter and no tetragonal cross-sections have been observed. Semicylindrical tubular microfossils are rare in Ediacaran rocks. To the best of our knowledge, only Conotubus L. Zhang and Lin in L. Zhang (1986...
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Journal Article
Published: 30 May 2017
Geological Magazine (2017) 155 (7): 1465-1474.
... . 1980 ), Koksuja Missarzhevsky (Missarzhevsky & Mambetov, 1981 ), Sinotubulites Chen, Chen & Qian ( 1981 ), Conotubus Zhang, Li & Dong (Ding, Zhang & Dong, 1992 ), and Rajatubulus Yang et al . ( 2016 ), in its evenly sloped transverse annuli and tuberculation; from...
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Journal Article
Journal: PALAIOS
Published: 01 May 2012
PALAIOS (2012) 27 (5): 354-372.
... al., 2011 ; Cai et al., 2012 ). The localized distributions of pyrite (≤70 µm in size) identified near or surrounding some Shaanxilithes specimens suggests that pyrite formation was curtailed during early authigenesis. Unlike the pervasive pyritization of Gaojiashan fossils such as Conotubus, which...
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Journal Article
Published: 01 November 2017
Geological Magazine (2017) 154 (6): 1187-1192.
... , a characteristic Ediacara organism (image courtesy of Z. Chen); fossil image of the Gaojiashan biota is Conotubus , a large tubular animal (image courtesy of Y. Cai); fossil images of the Meishucun fauna are Anabarites trisulcatus and Protohertzina anabarica ; fossil image of the Kuanchuanpu fauna...
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Journal Article
Published: 01 March 2014
Journal of Paleontology (2014) 88 (2): 224-239.
... et al., 2008 ; Tang et al., 2011 ). Exceptional preservation includes also organic tubular fossils ( Conotubus ) preserved as carbonaceous or glauconite impressions or by pyritization ( Hua et al., 2007 ). In Namibia and the White Sea coast of the EEP, siliciclastic sediments preserved the shape...
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Journal Article
Published: 27 April 2017
Geological Magazine (2017) 154 (6): 1257-1268.
.... 2012 ). In addition, the Ediacaran fossils Gaojiashania Yang, Zhang & Lin in Lin et al. ( 1986 ) and Conotubus Zhang & Lin in Lin et al. ( 1986 ) are also characterized by serially arranged modules (Cai et al. 2011 ; Cai, Hua & Zhang, 2013 ). However, Gaojiashania consists...
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Journal Article
Journal: Geology
Published: 01 August 2012
Geology (2012) 40 (8): 691-694.
..., is traditionally characterized as consisting of soft-bodied organic-walled animals and vendobionts. Among the oldest known nonmineralized metazoan exoskeletons are thin-walled organic tubes, such as the Ediacaran conulariid Vendoconularia ( Ivantsov and Fedonkin, 2002 ; Van Iten et al., 2005a ), Conotubus...
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Journal Article
Published: 01 March 2014
Journal of Paleontology (2014) 88 (2): 240-252.
.... Certainly, such clays are different from diagenetic mica minerals ( Fig. 3 .3, 3.4, Table 1 ), indicating different origins. Although detrital or authigenic clays may have played a constructive role in the preservation of Ediacaran fossils such as Aspidella ( Laflamme et al., 2011b ), Conotubus ( Cai...
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Journal Article
Published: 01 March 2015
Journal of Paleontology (2015) 89 (2): 281-291.
... H. , and Xiao S. , 2011 , Morphology and paleoecology of the late Ediacaran tubular fossil Conotubus hemiannulatus from the Gaojiashan Lagerstätte of southern Shanxi Province, South China : Precambrian...
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