Topic
Ushbaspis
About: Ushbaspis is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 9 citations.
Papers
TL;DR: Chien et al. as discussed by the authors showed that the base of the Duyunian stage can be tentatively correlated with the lower Leonian stage on the basis of several lines of evidence, such as the co-occurrences of Palaeolenus in the Acadoparadoxides mureroensis Zone (lower Leonian Stage), P. lantenoisi Zone and P. fengyangensis Zone.
Abstract: The base of the Duyunian Stage can be tentatively correlated with the base of the Leonian Stage on the basis of several lines of evidence: (1) the co-occurrences of Palaeolenus in the Acadoparadoxides mureroensis Zone (lower Leonian Stage), Palaeolenus lantenoisi Zone and Palaeolenus fengyangensis Zone (upper Tsanglangpuan Stage); (2) Palaeolenus sp. from the Lancara Formation (Protolenus dimarginatus Zone) below the Leonian Stage should be grouped within the genus Shifangia Chien et Yao in Lu et al., 1974 from the Paokannia–Szechuanolenus Zone and Ushbaspis Zone just below the Duyunian Stage (P. lantenoisi Zone); (3) Protolenus (Szechuanolenus) occurs just below Cambrian Stage 4 in the Mediterranean region and in South China; (4) a regressive event just below the Stage 4 base in both regions (the Leonian Event or Evento Valdemiedes Regressive Event in the Mediterranean region; Duyunian Event or middle Tsanglangpuan Regressive Event in South China). The upper Leonian Stage may be partly equivalent to the ...
10 citations
1 Jan 2003
TL;DR: In this paper, two new hyolithid species, Conotheca xinjiangensis sp. nov. and Nitorcornus wushiensis sp., and an indeterminate species Adyshevitheca sp. are systematically described.
Abstract: The hyolithid fossils studied herein were collected from the Lower Cambrian Xiaoerbulake Formation at the Wushi Phosphorite section in Wushi (Fig.1), Xinjiang. Two new hyolithid species, Conotheca xinjiangensis sp. nov. and Nitorcornus wushiensis sp. nov.,and an indeterminate species ?Adyshevitheca sp. are systematically described. C. xinjiangensis sp. nov. and N. wushiensis sp. nov. occur in the trilobite Kepingaspis\|Tianshanocephalus Biozone (Bed 11 of Zhou, 2001), while ? Adyshevitheca sp. occurs in the trilobite Ushbaspis Biozone (Bed 8 of Zhou, 2001) of the Xiaoerbulak Formation (Fig.2). These hyolithid fossils provide new evidence for the biostratigraphic correlation of the Xiaoerbulake Formation with the corresponding horizons in the adjacent areas. Trilobite biostratigraphy suggests that the two fossil horizons of the Xiaoerbulake Formation can be correlated with strata of the middle Canglangpuan stage on the Yangtze Platform, and with the Botomian stage on the Siberia Platform and in Kazakstan.
3 citations
Performance Metrics
| Year | Papers |
|---|---|
| 2014 | 1 |
| 2003 | 1 |