Yanjiahe Formation
The Yanjiahe Formation is a Cambrian fossiliferous geologic formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ... found in South China.Dong et al., 2009Yanjiahe Formation
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Among others, the following fossils were found in the formation: * '' Aldanella attleborensis''Guo et al., 2009 * ' ...
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Formation (geology)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob Wer ...
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Yuknessia
''Yuknessia'' is an early pterobranch, known from the Burgess shale, the Chengjiang and the Wheeler shale. Long, unbranched fronds emerge from a central holdfast-like body covered in small conical plates. 23 specimens of ''Yuknessia'' are known from the Greater Phyllopod bed, where they comprise < 0.1% of the community. The genus contains two species: the type species ''Y. simplex'' and ''Y. stephenensis''. It was originally interpreted as a , and has since been reinterpreted it as a colonial

Protohertzina
''Protohertzina'' is a genus of conodonts (protoconodonts or paraconodonts) or, possibly, Chaetognaths, found at the beginning of the Cambrian explosion. Protoconodonts are an extinct taxonomic group of conodonts.Zooproblematica and mollusca from the Lower Cambrian Meishucun section (Yunnan, China) and taxonomy and systematics of the Cambrian small shelly fossils of China. P. Y. Parkhaev and Y. Demidenko, Paleontological Journal, 2010, volume 44, issue 8, pages 883-1161, Chaetognaths (also known as arrow worms) were thought possibly to be related to some of the animals grouped with the conodonts. The conodonts themselves, however, are thought to be related to the vertebrates. It is now thought that protoconodont elements (e.g., ''Protohertzina anabarica'' Missarzhevsky, 1973), are probably grasping spines of chaetognaths rather than teeth of conodonts. ''Protohertzina'' fossils have been found in the Ingta Formation of Canada. Use in stratigraphy The earliest known fossils ...
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Lapworthella
The camenellans, consisting of the genera ''Camenalla'', ''Dailyatia'', ''Kennardia'', ''Kelanella'', ''Wufengella'' and ''Lapworthella'', are a (probably monophyletic) group of Tommotiid invertebrates from the Cambrian period, reconstructed as sister to all others (plus brachiopods and phoronids). They are primarily known from isolated sclerites, but are believed to have a scleritomous, ''Halkieria''-like construction.Skovsted, C. B., Betts, M. J., Topper, T. P. & Brock, G. A. The early Cambrian tommotiid genus ''Dailyatia'' from South Australia. Mem. Assoc. Australas. Palaeontol. 48, 1–117 (2015).Murdock, D. J. E., Donoghue, P. C. J., Bengtson, S. & Marone, F. Ontogeny and micro-structure of the enigmatic Cambrian tommotiid ''Sunnaginia'' Missarzhevsky, 1969. Palaeontology 55, 661–676 (2012). This was confirmed by the discovery of ''Wufengella,'' known from articulated remains, which showed camenellans to be mobile, worm-like animals. ''Dailyatia'' and ''Camenella'' have dis ...
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Yanjiahella Biscarpa
''Yanjiahella biscarpa'' is an extinct species of Ediacaran and Early Cambrian deuterostome which may represent the earliest stem group echinoderm. This species is known from the Ediacaran to Fortunian Yanjiahe Formation (~541.0–534.6 Ma) in Hubei province, China and was first described by Guo et al. who had difficulty in assigning a taxonomy to the animal due to the shared nature of its features between the hemichordates and echinoderms. Etymology The ''Yanjiahella'' genus takes its name from the Yanjiahe Formation combined with the Latin diminutive "-ella" in reference to the small size of the species with the species name ''biscarpa'' deriving from the Latin "''bis''" meaning two, and Greek "''carpa''" meaning arms. Guo et al. originally divided the Yanjiahella genus into three species based on the number of feeding appendages, ''Y. ancarpa'' (meaning "no armed") ''Y. monocarpa'' (meaning "single armed") and ''Y. biscarpa''. However, analysis by Topper et al. showed ide ...
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