... new sites of the Lower Cambrian Yuanshan Formation was examined. The sample includes several with exceptional preservation of nonmineralized skeletons that reveal previously unknown features and fill a gap in our knowledge of the detailed anatomy of fossil discinids. It is here reinterpreted...

... 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...

... 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...

... arthropod cuticle, 3 Pararotadiscus guizhouensis (eldoniid), 1 indeterminate alga]; the Kinzers biota of the Ledger Formation (LC: 1 indeterminate cuticle, 1 indeterminate alga); the Marjum Formation [MC: 1 Leanchoilia? sp. cf. protogonia (arthropod), 1 Yuknessia simplex (alga)]; the Spence Shale Member...

... 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...

... on the basis of co-occurrence of Balcoracania (Jell in Bengtson et al., 1990 ). Paterson and Brock ( 2007 ) described Yunnanocephalus macromelos from the Mernmerna Formation, indicating a link between Palmer and Rowell’s ( 1995 ) Assemblage 1 (which contains members of the genus) and the Pararaia...

... 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...

... also been very similar. New well-preserved specimens not only provide new members of the chancelloriids, but also help disclose the original appearance of this enigmatic group. Chancelloriids, especially Allonnia from early and middle Cambrian, may have had the ability to partially...

... was restricted to the lower Cambrian Yu'anshan Member in China and the middle Cambrian Burgess Shale Formation ( Dornbos et al., 2005 ). This study recognized different adaptations of sponges based on form and structural characteristics, some of them taken from previous analyses ( Thayer, 1975 , 1983...

.... A large collection of specimens from the Xihaoping Member of the Dengying Formation in southern Shaanxi Province permits its detailed redescription. These fossils are highly variable in shape but this variation is continuous and does not support the current recognition of multiple species...

.... sp. is not the first member of this genus to be illustrated and described from the Himalaya. Fuchs and Mostler ( 1972 ) provided representative drawings of the 5+0 ray structured Archiasterella pentactina (Sdzuy, 1969 ) and other sclerites that they described as stauractine “ Archiaster...

... ). In the Xiaotan section, high Mo and V contents are found to occur at the bottom of the Shiyantou Fm (or Stage 2) and in the basal Yuanshan Fm (Stage 3). This sulphides bed in the lower Niutitang Fm is stratigraphically equivalent to the basal Shiyantou Fm, and has been found to occur along a narrow NE–SW...

... to represent members of the stem lineage of extant clades. The first appearances of these groups are clustered geochronologically by higher-rank phylogeny (Budd, 2003 ; Landing & Westrop, 2004 ; Li et al . 2007 ). Budd ( 2003 ) and Budd & Jensen ( 2000 , 2003 ) argued that this clustering reflects...

... ). A significant Ediacaran hiatus preceded obduction of ca. 570 Ma ophiolites to the south of the Dzabkhan basin ( Khain et al., 2003 ), which suggests there was south-dipping subduction (in present-day coordinates) that led to rapid accumulation of the upper Tsagaan Oloom Formation (Zuune Arts Member...