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Chuaria circularis

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Journal Article
Published: 01 May 1990
Journal of Paleontology (1990) 64 (3): 488.
Series: GSA Microform Publication
Published: 01 January 1990
DOI: 10.1130/micro20-p168
EISBN: 9780813759203
...Abstract Abstract This is the first supplement to the Annotated Bibliography of the World Literature on the Grand Canyon Type Fossil Chuaria circularis Walcott, 1899. The reader is referred to extensive introductory material that appeared in Vol. 3 of the Grand Canyon bibliography (Spamer, 1988...
Series: GSA Microform Publication
Published: 01 January 1983
DOI: 10.1130/micro17-p94
EISBN: 9780813759173
...Abstract Abstract This annotated bibliography is a guide to the literature on Chuaria Walcott, 1899, currently understood to be a nmnospecific genus represented by C. circularis Walcott, to which a number of other taxa have been referred in taxonomic synonymy. Because of the taxonomic...
Journal Article
Published: 01 November 1973
Journal of Paleontology (1973) 47 (6): 1108–1112.
Series: GSA Microform Publication
Published: 01 January 1983
DOI: 10.1130/micro17-p50
EISBN: 9780813759173
... and is cross-indexed to all three volumes. The opportunity is taken herein to also update entries for Chuaria circularis Walcott and for Melanocyrillium Bloeser, spp. The updated entry for C. circularis complements Part III of this volume, the annotated bibliography of the world literature on Chuaria...
Book Chapter

Editor(s)
Earle E. Spamer
Series: GSA Microform Publication
Published: 01 January 1983
DOI: 10.1130/micro17-p4
EISBN: 9780813759173
... is the inclusion of a third part, “An annotated Bibliography of the World Literature on the Grand canyon Type Fossil Chuaria circularis Walcott, 1899, an Index Fossil for the Late Proterozoic” This bibliography was prepared as a separate publication. However, it is apparent from reading the very recent literature...
Journal Article
Published: 01 January 1979
Canadian Journal of Earth Sciences (1979) 16 (1): 150–166.
... the filaments Archaeotrichion , Taeniatum and Siphonophycus , and the sphaeromorph acritarchs Kildinella , Trachysphaeridium , Nucellosphaeridium , and Chuaria circularis . The megafossils, ail of probable algal affinities, comprise large carbonaceous ribbons assigned to the new vendotaenid species Tawuia...
Image
Acritarchs of the Cango Caves Group. Location of samples: see Figure 2 . ( ...
Published: 01 June 2006
faveolata , Kombuis Member, sample GGO 27 A (specimen 7). Note translucent microspheres near the edge of the vesicle. ( d ) Leiosphaeridia tenuissima , Nooitgedagt Member, sample GGO 24 C (specimen 12). The same specimen could be classified under Chuaria circularis Walcott, depending on the lower size
Image
Figure  14 — 1–5,  Ostiumsphaeridium complitum  n. sp.;  1,  holotype, 66-6...
Published: 01 March 2009
Figure 14 — 1–5, Ostiumsphaeridium complitum n. sp.; 1, holotype, 66-6 (2601, 5), p. 3, 14700-534; 2, 62N2-51 (2605, 5), p. 1, 14700-216; 3, 62N2-50 (2605, 5), p. 7, 14700-212; 4, paratype 68-2 (2648, 5), p. 2, 14700-554; 5, 69V-20 (2647, 5), p. 2, 14700-712; 6, Chuaria circularis
Image
Acritarchs of the Gamtoos Group and Sardinia Bay Formation. Location of sam...
Published: 01 June 2006
Figure 8. Acritarchs of the Gamtoos Group and Sardinia Bay Formation. Location of samples: see Figure 4 . ( a ) Chuaria circularis , sample GGG 39C (specimen 1), Klein Rivier Formation. ( b ) Leiosphaeridia tenuissima , sample GGG 102 (specimen 1), Klein Rivier Formation. ( c ) Leiosphaeridia
Journal Article
Journal: Geology
Published: 01 January 2017
Geology (2017) 45 (1): 75–78.
...-SEM. All illustrated specimens were deposited at the Virginia Polytechnic Institute Geosciences Museum (VPIGM, Blacksburg, Virginia, USA). Under RLM, Chuaria specimens from the Liulaobei Formation conform to the diagnosis of Chuaria circularis ( Walcott, 1899 ). They are spherical vesicles...
Journal Article
Journal: Geology
Published: 01 December 2001
Geology (2001) 29 (12): 1119–1122.
.... Because of similar morphology, size, and co-occurrence with Chuaria circularis Walcott, Beltanelliformis was treated within the Chuaria - Tawuia - Beltanelliformis group ( Steiner, 1997 ). A detailed study of these fossils did not reveal any characters typical of cnidarians, such as tentacles...
FIGURES | View All (8)
Journal Article
Published: 01 November 2019
Journal of Paleontology (2019) 93 (6): 1276–1278.
... ) briefly raise the similarity of Cambrowania ovata to the carbonaceous spheroid Chuaria circularis Walcott 1899 (Tang et al., 2017 ), but dismiss any deeper comparison on the grounds that no Chuaria are known with an interlaced truss of crossbars. Chuaria does exhibit occasional linear folds...
FIGURES
Journal Article
Published: 01 June 2006
South African Journal of Geology (2006) 109 (1-2): 193–214.
... faveolata , Kombuis Member, sample GGO 27 A (specimen 7). Note translucent microspheres near the edge of the vesicle. ( d ) Leiosphaeridia tenuissima , Nooitgedagt Member, sample GGO 24 C (specimen 12). The same specimen could be classified under Chuaria circularis Walcott, depending on the lower size...
FIGURES | View All (12)
Journal Article
Journal: Geology
Published: 01 June 2015
Geology (2015) 43 (6): 507–510.
... . Steiner M. , 1997 , Chuaria circularis Walcott 1899—“Megasphaeromorph acritarch” or prokaryotic colony? : Acta Universitatis Carolinae Geologica , v. 40 , p. 645 – 665 . Takeuchi N. , 2013 , Seasonal and altitudinal variations in snow algal communities on an Alaskan glacier (Gulkana...
FIGURES
Journal Article
Journal: Geology
Published: 01 July 2011
Geology (2011) 39 (7): 643–646.
... processes responsible for the preservation of carbonaceous compressions. Chuaria , as represented by its type species C. circularis , is an acritarch characterized by a smooth vesicle with a diameter of 0.4–5 mm and a relatively thick organic wall (∼2 μm). Often preserved as compressions, its...
FIGURES
Series: Geological Society, London, Special Publications
Published: 01 January 2007
DOI: 10.1144/SP286.35
EISBN: 9781862395343
..., the tidal flat environment changed to an open marine setting (S2), which persisted until the Ediacaran into the Early Cambrian. Some pelagic fossils, e.g. Chuaria circularis , Vendotaenia sp. and Tawuia fusiformis are preserved in these sediments. At the beginning of the Cambrian, open marine...
Journal Article
Published: 01 November 2010
Russ. Geol. Geophys. (2010) 51 (11): 1192–1198.
... ). This agrees with data on microfossils from the Khaipakh Formation. Its lower part contains Polytrichoides lineatus Herm., Digitus parvus Pjat., D. fulvus Pjat., Chuaria circularis Walcott, Ostiania microcystis Herm., Pulvinosphaeridium priscum Pjat., and Rugosoopsis latus (Jank.) ( Khomentovsky...
FIGURES
Journal Article
Published: 01 March 2009
Journal of Paleontology (2009) 83 (2): 161–196.
...Figure 14 — 1–5, Ostiumsphaeridium complitum n. sp.; 1, holotype, 66-6 (2601, 5), p. 3, 14700-534; 2, 62N2-51 (2605, 5), p. 1, 14700-216; 3, 62N2-50 (2605, 5), p. 7, 14700-212; 4, paratype 68-2 (2648, 5), p. 2, 14700-554; 5, 69V-20 (2647, 5), p. 2, 14700-712; 6, Chuaria circularis...
FIGURES | View All (16)
Journal Article
Journal: Geology
Published: 01 July 2000
Geology (2000) 28 (7): 619–622.
... ) to one of isotopic extremes began by ca. 800–740 Ma in the context of the rifting of Rodinia. The Chuar Group has been known to be fossiliferous since the discovery of the millimeter-scale compression fossil Chuaria circularis by Walcott (1899) . Thought to be the reproductive cysts...
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