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Yuanshan Formation

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Journal Article
Published: 01 July 2002
Journal of Paleontology (2002) 76 (4): 596–606.
... Wutingaspis-Eoredlichia Interval Zone of the Yuanshan Formation ( Fig. 2 ) at four localities within Chengjiang and Jinning counties (Yunnan Province). Most specimens were discovered at Mt. Maotian, but some single individuals were recently recovered at Mt. Maan, in Xiaolantian (all Chengjiang County...
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Figure7—Heliomedusa orienta, Lower Cambrian, Yuanshan Formation, Kunming, Yunnan, China: 1, anterior adductor scar (short arrow) and platform (long arrow) on dorsal interior, SK60054; 2, anterior adductor scar (short arrow) and inferred pedicle muscles (long arrow) in the foramen on ventral exterior, SK60015; 3, pedicle (arrow) exposed by the loss of the posterior sector of the ventral valve in incomplete conjoint specimen, SK60005; 4, remains of the inferred pedicle muscles (arrow) on ventral interior, SK60008; 5, cast of the pedicle (arrow) on the posterolateral sector of the ventral valve, SK60014b; 6, counterpart of 5, the rest of the conjoint fossil with the pedicle cavity (arrow); note the pseudointerarea (short arrow) on the underlying dorsal valve, SK60014a. The anterior end of the fossil faces the right side of the printed page in 1, the top of the page in 2–4, and the left side in 5, 6. Scale bar = 2.5 mm for 2, 4; 2 mm for all others
Published: 01 January 2007
Figure 7 — Heliomedusa orienta , Lower Cambrian, Yuanshan Formation, Kunming, Yunnan, China: 1 , anterior adductor scar (short arrow) and platform (long arrow) on dorsal interior, SK60054; 2 , anterior adductor scar (short arrow) and inferred pedicle muscles (long arrow) in the foramen
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Figure4—Heliomedusa orienta, Lower Cambrian, Yuanshan Formation, Yunnan, China: 1, spine (long arrow) and spine stump (short arrow) on partially exposed ventral exterior, SK60004; 2–4, foramen (arrow) on ventral exterior, SK60050, SK60051, SK60052; 5, radial striae (inset) and foramen (arrow) on mold of ventral exterior, SK60049; 6, spine (arrow) and concentric fila (inset) on partially exposed ventral exterior, SK60006. The anterior end of the fossil faces the top of the printed page except in 3, where it faces the right side. Scale bar = 0.5 mm for 1; 2 mm for 2, 4; 1 mm for 3, 5; 1.2 mm for 6. Insets = 4× of object defined in the respective figure
Published: 01 January 2007
Figure 4 — Heliomedusa orienta , Lower Cambrian, Yuanshan Formation, Yunnan, China: 1 , spine (long arrow) and spine stump (short arrow) on partially exposed ventral exterior, SK60004; 2 – 4 , foramen (arrow) on ventral exterior, SK60050, SK60051, SK60052; 5 , radial striae (inset) and foramen
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Figure3—Heliomedusa orienta, Lower Cambrian, Yuanshan Formation, Yunnan, China: 1, growth disturbance (arrows) around the umbo on the dorsal exterior of the posterior fragment of the shell, SK60030; 2, umbo (short arrows) on dorsal exterior; the loss of a posterolateral sector of the dorsal shell exposes a lateral half of the foramen (long arrow) on ventral interior, SK60031; 3, umbo (short arrows) and foramen (long arrow) on ventral exterior, SK60033; 4, pseudointerarea (arrow) and molds of lophophore cirri (arrowhead) on dorsal exterior, SK60007; 5, pits on the cast of dorsal interior, SK 60014; 6, jagged rims of the pits on the cast of dorsal exterior, SK60318. The anterior end of the fossil faces the bottom of the printed page in 1, the top of the page in 2, 3, and the right side in 4. Scale bar = 2 mm for 1–4; 1 mm for 5; 0.2 mm for 6
Published: 01 January 2007
Figure 3 — Heliomedusa orienta , Lower Cambrian, Yuanshan Formation, Yunnan, China: 1 , growth disturbance (arrows) around the umbo on the dorsal exterior of the posterior fragment of the shell, SK60030; 2 , umbo (short arrows) on dorsal exterior; the loss of a posterolateral sector
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Figure5—Heliomedusa orienta, Lower Cambrian, Yuanshan Formation, Kunming, Yunnan, China: 1–3, median septum (long arrow) continuing into a U-shaped ridge (double-headed arrow) on ventral interior; note the mold of cirrus (arrowhead) in 2, the incomplete specimen without a posterolateral sector; note the anterior adductor scar (short arrow) in 3, SK60517, SK60518, and SK60519; 4, visceral cavity (central area within short arrows) and mantle cavity (double-headed arrow marks its widest part) on ventral interior, SK60520; 5, anterior adductor scar (short arrow), cirrus (arrowhead), and mold of platform (long arrow) on ventral interior, SK60521a; 6, counterpart of 5, with cast of platform (long arrow) on dorsal interior; other labels as in 5, SK60521b. The anterior end of the fossil faces the top of the page in 1, 3, and the right side in 2, 4–6. Scale bar = 3 mm for 2; 3.5 mm for all others
Published: 01 January 2007
Figure 5 — Heliomedusa orienta , Lower Cambrian, Yuanshan Formation, Kunming, Yunnan, China: 1 – 3 , median septum (long arrow) continuing into a U-shaped ridge (double-headed arrow) on ventral interior; note the mold of cirrus (arrowhead) in 2 , the incomplete specimen without a posterolateral
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Figure6—Heliomedusa orienta, Lower Cambrian, Yuanshan Formation, Kunming, Yunnan, China: reconstruction of 1, ventral exterior; 2, dorsal exterior; 3, ventral interior; and 4, dorsal interior. Surface ornamentation of striae and fila omitted
Published: 01 January 2007
Figure 6 — Heliomedusa orienta , Lower Cambrian, Yuanshan Formation, Kunming, Yunnan, China: reconstruction of 1 , ventral exterior; 2 , dorsal exterior; 3 , ventral interior; and 4 , dorsal interior. Surface ornamentation of striae and fila omitted
Journal Article
Published: 01 January 2007
Journal of Paleontology (2007) 81 (1): 38–47.
...Figure 7 — Heliomedusa orienta , Lower Cambrian, Yuanshan Formation, Kunming, Yunnan, China: 1 , anterior adductor scar (short arrow) and platform (long arrow) on dorsal interior, SK60054; 2 , anterior adductor scar (short arrow) and inferred pedicle muscles (long arrow) in the foramen...
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Figure2—Heliomedusa orientaSun and Hou, 1987a, Lower Cambrian, Yuanshan Formation, Yunnan, China. Scatter diagram and regression coefficient of: top left, ventral shell length in 59 specimens of different shell widths; top right, pseudointerarea width in eight specimens of different dorsal shell widths; bottom left, foramen length in 26 specimens of different ventral shell lengths; bottom right, foramen width in 25 specimens of different ventral shell widths. Abbreviations used: x̄, ȳ—sample means, s.d.—standard deviation, r—correlation coefficient, and n—sample size
Published: 01 January 2007
Figure 2 — Heliomedusa orienta Sun and Hou, 1987a , Lower Cambrian, Yuanshan Formation, Yunnan, China. Scatter diagram and regression coefficient of: top left , ventral shell length in 59 specimens of different shell widths; top right , pseudointerarea width in eight specimens of different
Journal Article
Published: 01 January 2015
Journal of Paleontology (2015) 89 (1): 96–102.
... Cambrian Yuanshan Formation of Yunnan, China, but the central lobe in the latter is located close to the anterodorsal margin (Hou et al., 2002 ). Cambraechmina Hinz-Schallreuter, 1993b from the middle Cambrian ( Triplagnostus gibbus Zone; Cambrian Series 3, Stage 5...
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Journal Article
Published: 01 September 2005
Journal of Paleontology (2005) 79 (5): 987–996.
... sclerites can loosely tessellate, ×22.5; 2, oblong structures shown well preserved, ×30.0 08 09 2004 Though complete chancelloriid scleritomes are rare, they are now known from several localities worldwide. Material from the Yuanshan Formation preserves fine detail of the integument...
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Journal Article
Journal: Geology
Published: 05 February 2021
Geology (2021) 49 (6): 623–628.
... of the United States of America , v. 116 , p. 17659 – 17665 , https://doi.org/10.1073/pnas.1902273116 . Janussen , D. , Steiner , M. , and Zhu , M. , 2002 , New well-preserved scleritomes of Chancelloridae from the early Cambrian Yuanshan Formation (Chengjiang, China) and the middle...
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Journal Article
Journal: Geology
Published: 01 October 2008
Geology (2008) 36 (10): 755–758.
... important BST assemblages, those of the Middle Cambrian Burgess Shale and the Lower Cambrian Maotianshan Shale (Yuanshan Formation, Chengjiang, China). Typically, BST fossils are preserved as dark-colored films, often reflective, exposed on bedding surfaces of the host mudstones. Burgess Shale fossils were...
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Journal Article
Published: 01 August 1992
Journal of the Geological Society (1992) 149 (4): 621–629.
... yet to be undertaken. Laminar fenestrae pro- vide evidence for peritidal emergence at the top of the grand cycles (e.g. top Donglangtan and Dengying formations). Or- ganic-rich shales are present in the lower parts of the cycles (e.g. Jiucheng, lower Badaowan and Yuanshan members). The extent...
Journal Article
Published: 26 June 2018
Journal of Paleontology (2018) 92 (6): 955–971.
...]. Janussen , D. , Steiner , M. , and Zhu , M.Y. , 2002 , New well-preserved scleritomes of Chancelloridae from the early Cambrian Yuanshan Formation (Chengjiang, China) and the middle Cambrian Wheeler Shale (Utah, USA) and paleobiological implications : Journal of Paleontology , v. 76 , p...
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Journal Article
Published: 01 July 2022
Journal of Paleontology (2022) 96 (4): 770–790.
... Life Research Center, Chengjiang ELRC80001, Yuanshan Formation, Chengjiang, Yunnan, China (Chen and Zhou, 1997 , p. 88, fig. 143). Smithsonian Institution (USNM); Yale Peabody Museum of Natural History (YPM). Fuxianospira gyrata Chen and Zhou, 1997 , from the Yuanshan...
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Journal Article
Published: 08 November 2019
Geological Magazine (2020) 157 (7): 1112–1120.
... consists of the upper Dengying Formation, the Zhujiaqing Formation, the Shiyantou Formation, the Yuanshan Formation and the Canglangpu Formation ( Fig. 2 ). The strata of the upper Dengying Formation, including Donglongtan, Jiucheng and Baiyanshao members, were deposited in a widespread prograding platform...
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Journal Article
Published: 01 May 2019
Journal of Paleontology (2019) 93 (3): 437–459.
... (Betts et al., 2017 ). The Eoredlichia-Wutingaspis Zone is equivalent to the Pelagiella subangulata Zone of East Yunnan and central Sichuan in South China (Steiner et al., 2007 ). The uppermost Shiyantou, Yuanshan (Yunnan Province) and upper Jiulaodong (Sichuan Province) formations of this zone...
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Journal Article
Published: 01 January 2016
Journal of Paleontology (2016) 90 (1): 10–30.
... Cambrian Yuanshan Formation (Chengjiang, China) and the middle Cambrian Wheeler Shale (Utah, USA) and paleobiological implications : Journal of Paleontology , v. 76 , p. 596 – 606 . Jell , P.A. , and Hughes , N.C. , 1997 , Himalayan Cambrian trilobites : Special Papers in Palaeontology...
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Journal Article
Journal: PALAIOS
Published: 01 March 2008
PALAIOS (2008) 23 (3): 124–138.
... in the Nemakit-Daldynian ( Qian and Bengtson, 1989 ; Rozanov and Zhuravlev, 1992 ) and whole sponge bodies in the lower Cambrian of China (Yuanshan Formation; Zhu et al., 2001 ). The rest of the lower–middle Cambrian sponges lived in outer shelf environments or deep basins. The skeletal architecture apparently...
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Journal Article
Published: 01 November 2010
Journal of Paleontology (2010) 84 (6): 1040–1060.
... skeletal fossils, southern Shaanxi : Acta Palaeontologica Sinica , 42 . 189 – 199 . Janussen , D. , Steiner , M. , and Zhu , M-Y. , 2002 , New well-preserved scleritomes of Chancelloridae from the Early Cambrian Yuanshan Formation (Chengjiang, China) and the Middle Cambrian Wheeler...
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