Abstract
AbstractEight bryozoan species are described from the Hanchiatien Formation (lower Silurian, Telychian) of southern Chongqing, South China. Four species are new: the trepostomesAsperopora sinensisn. sp.,Trematopora jiebeiensisn. sp., andTrematopora tenuisn. sp., and the fenestrateMoorephylloporina parvulan. sp. One species, the cystoporateHennigoporasp. indet., is described in open nomenclature.Moorephylloporina parvulan. sp. is eurytopic, occurring in all types of facies within the bioherms. ErectMoorephylloporinaBassler, 1952,TrematoporaHall, 1852, andLeioclemaUlrich, 1882 formed pioneering communities on weakly cemented substrata, whereas encrustingFistuliporaM‘Coy, 1849,HennigoporaBassler, 1952, andAsperoporaOwen, 1969 occurred on hardgrounds and formed densely compact framestones. Robust branchedTrematoporaandLeioclematend to occur out of the reef core (framework) where they could have formed reef-flank thickets in more agitated conditions. The generic composition of the studied fauna correlates with other localities in South China, and they show general paleobiogeographic relations to Siberia and Indiana, USA.UUIDhttp://zoobank.org/3326dd2f-7c9e-43bc-9dab-84047b274f89
Highlights
Lower Silurian (Llandovery) marine sediments are distributed along a NNE-SSW trend on the South China plate, which was largely occupied by the Yangtze region in the northwestern sector
Characterized by reticular colonies, Moorephylloporina can be found in all types of facies in these meter-scale reefs, indicating its eurytopic nature
Such distribution could be explained by taphonomic processes and postmortem transportation of Moorephylloporina fragments from reef areas inhabited by this species within the whole reef
Summary
Lower Silurian (Llandovery) marine sediments are distributed along a NNE-SSW trend on the South China plate, which was largely occupied by the Yangtze region in the northwestern sector. Hu (1982) identified six bryozoan species from the Cuijiagou Formation (lower Telychian) of Guangyuan, Sichuan: Fistulipora guangyuanensis Hu, 1982, Fistuliramus eximius Hu, 1982, Hennigopora multilamellosa Hu, 1982, Hennigopora sp. We provide the first taxonomic description of the bryozoans from the lower Hanchiatien Formation at the border of Guizhou Province. The stratigraphic details were given by Li et al (2018) who described the lower Hanchiatien Formation as brownish to greenish shales with minor silstones, which cap the Shihniulan Formation disconformably. Our interpretation is that the lower Hanchiatien Formation in Jiebei represents mid-outer ramp settings
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