Volume 56,Issue 1,2017 Table of Contents

1 New Material of Ushbaspis hubeiensis in Zigui, Hubei, China and Its Significance

LIN Tian-rui

2017, 56(1):1-9. CSTR:

[Abstract](297) [HTML](0) [PDF 0.00 Byte](5)

Abstract:
In the present paper, through the study of new material of Ushbaspis hubeiensis (Lin, 1978), not only gave us more to consider for dorsal exoskeleton of Ushbaspis hubeiensis (Lin, 1978) and also for one nearly complete specimen of Metaredlichioides constrictus Qian and Yao in Zhang et al., 1980 (Zhang et al., 1980, pl. 30, fig. 5) (= Ushbaspis constrictus (Qian and Yao) in Zhang et al., 1997, fig. 277-1c) transferred to Kepingaspis Zhang, 1965 afforded much evidence herein.

2 Revision on the Type Species of the Genus Kunmingaspis Chang, 1964 (Trilobita)

GAO Jian , YUAN Jin-liang

2017, 56(1):10-19. CSTR:

[Abstract](262) [HTML](0) [PDF 0.00 Byte](6)

Abstract:
Based on the new material collected from the Douposi Formation at Shangwuying Village, Yiliang County Yunnan Province, the type species of the genus Kunmingaspis Chang, 1964 is revised. We deny the opinion to identify differentiation between two genera (Kunmingaspis and Yuehsienhszella), Zhang (1964) and Jell and Hughes (1997) considered that “the eye ridge meeting the axial furrow at the level of the rear of the anterior glabellar lobe is distinctive of the genus”. Because an indistinct connection between frontal lobe of glabella and ocular ridge is difficult to be identified on some specimens. The real differentiations selected to be valid are the outline and feature of the frontal lobe of the glabella. Similarly, such as tip of organs about characters (also called character of degradation, or obscure character) can not be excessively weighted in stage of early classification or identification when the phylogeny is unclear，for instance, the S4, the posterior end of several axial ring (may be including the terminal axial piece) of pygidium etc. and invariability and stability of characters should be listed in the diagnosis to distinguish it from other genera. Kunmingaspis differs from Yuehsienszella mainly in having wider less tapering forward glabella with broadly rounded anterior margin, narrower fixigenae between palpebral lobes, relatively longer palpebral lobe of about 1/3 glabellar length (sag.), by contrast in Yuehsienhszella the palpebral lobe is about 1/4 glabellar length (sag.). Besides Yuehsienhszella has a shallower anterior border furrow, wider fixigenae between palpebral lobes (tr.), shallower less curving forward posterior border furrow medially and broader less tapering backward pygidial axis. In the present paper Kunmingaspis yunnanensis Chang, 1964, K. qianbeiensis Zhou in Lu et al., 1974, K. songlinensis Lee in Yin et Lee, 1978, K. longa Zhou in Zhang et al., 1980, K. brevica Zhou in Zhang et al., 1980 are considered as synonymous with K. sakesarensisa (King, 1941). Biostratigraphical, it can be correlated closely between the Yangtze Platform and Himalaya Area (Pakistan or Indian subcontinent).

3 Techniques of Exuviation in Liaodong Species of Early Cambrian Trilobite Redlichia (Pteroredlichia) murakamii Resser et Endo

Pang Chong-jin , Han Nai-ren , Chen Gui-ying , Wen Shu-nü

2017, 56(1):20-24. CSTR:

[Abstract](282) [HTML](0) [PDF 0.00 Byte](7)

Abstract:
An uncommon form of exuviation, involving inversion of cranidium, is well preserved in a trilobite specimen of Early Cambrian Redlichia murakamii Resser et Endo collected from the Benxi region in eastern Liaoning Province, North China This specimen provides an important insight into the techniques of the exuviation of the Cambrian Redlichia. In this moulting specimen, free cheeks are not preserved, whereas thoracic segments are associated with pygidium, but displaced from the cranidium, which was inverted beneath thoracic segments without significant lateral displacement, indicating an autochthonous origin. The mechanism of the exuviation is interpreted as follow: the facial suture functioned efficiently and thus split first, followed by an upward thrust and the enrolment of the cephalon, which resulted in the inversion of the cranidium as well as the separation between thoracic segments, free cheeks and cranidium, and finally the postecdysial trilobite struggled to get rid of proecdysial exuvia. Such a form of exuviation for Early Cambrian Redlichia in North China is different from those of the Cambrian Redlichia in Australia reported by McNamara (1986).

4 Ontogeny of the Trilobite Redlichia (Pteroredlichia) chinensis (Walcott, 1905) from the Cambrian Balang Formation

LIANG Bo-yan , PENG Jin , WEN Rong-qin , LIU Shuai

2017, 56(1):25-36. CSTR:

[Abstract](239) [HTML](0) [PDF 0.00 Byte](6)

Abstract:
The Balang Formation is a fossiliferous unit and had a widely geographic distribution in eastern Guizhou, China. The Balang Fauna, which a Burgess Shale-type biota from the Cambrian Series 2 of Guizhou, yields in the middle and upper parts of the formation. The Balang Fauna consists of representatives of eight major groups, such as poriferans-chanceleoriids, sponge, cnidarians, priapulids, brachiopods, molluscs, arthropods, and echinoderms, except animals, including algae and trace fossils. Trilobites of arthropods is an important group. The trilobite sequence in the Balang Formation is continuous and preserved individuals of different ontogenetic stages, which provides important material for ontogenetic study of species–level from this group. Here, based on over 300 specimens, by methods of statistics, and combined evolutional characters of each stage, we mainly focus on the ontogenetic characters of Redlichia (Pteroredlichia) chinensis (Walcott, 1905), to describe characters of the protaspid, meraspid to holaspid periods of the species and analyze trends of their morphologic evolution. The new data enrich our understanding of ontogeny of R. (Pteroredlichia) chinensis and provide significant criteria for taxonomic identification.

5 Middle to Upper Ordovician Conodont Succession from the Qiliao Section of Shizhu, Chongqing—Revealing a Depositional Hiatus between Lower Darriwilian and Sandbian

Wang Zhi-hao , Zhen Yong-yi , Ma Xuan , Zhang Yuan-dong

2017, 56(1):37-53. CSTR:

[Abstract](230) [HTML](0) [PDF 0.00 Byte](6)

Abstract:
Conodonts from the Padoda Formation (Katian) to the Kuniutan Formation (early Darriwilian) in the Qiliao section, Shizhu, Chongqing are documented. They can be subdivided into (in descending order) the following 7 conodont biozones, including the Hamarodus brevirameus, Amorphognathus superbus, Baltoniodus alobatus, B. variabilis, Yangtzeplacognathus jianyyensis, Yangtzeplacognathus crassus and Lenodus variabilis biozones. The boundaries of the Katian/Sandbian and the Sandbian/Darriwilian are within the Baltoniodus alobatus Biozone and the Yangtzeplacognathus jianyyensis Biozone respectively. The Guniutan Formation in this section is incomplete in comparison with the type section in Yichang of Hubei Province, with only two conodont biozones, namely the Yangtzeplacognathus crassus and Lenodus variabilis biozones of the early Darriwilian age represented. Therefore the absence of Yangtzeplacognathus protoramosus, Y. foliaceus, Eoplacognathus suecicus and Dzikodus tablepointensis biozones of the middle to upper Darriwilian in this section indicates a significant depositional hiatus between the Kuniutan Formation (early Darriwilian) and the Datianba Formation (Sandbian). Apparently, the time span of the hiatus is well corresponded to the major eustatic sea-level fall during the mid-late Darriwilian. However, this preliminary result is yet to be confirmed by further detailed studies in a wider area located near the current western and northwestern margins of the Yangtze Platform to better confine the temporal and spacial distribution of the hiatus identified herein.

6 The Astogenies of Silurian Graptolite Oktavites spiralis Based on Specimens from the Northwestern Margin of the Yangtze Platform, South China

Wang Xin , Wang Jian , Zhang Ju

2017, 56(1):54-67. CSTR:

[Abstract](198) [HTML](0) [PDF 0.00 Byte](5)

Abstract:
A graptolite index species of Telychian Age (late Llandovery, Silurian), Oktavites spiralis Geinitz, 1842, is significant in stratigraphy correlation due to its typical morphological characters, rapid evolution and global distribution. However, controversies on the stratigraphic range of the species derived from the its broad definition without information of population variation has led to difficulties in regional correlations. In order to increase the accuracy of description, 45 specimens of Oktavites spiralis with different developmental stages have been collected from Oktavites spiralis Zone to Cyrtograptus lapworthi Zone (Telychian stage) in the Ziyang–Langao area, and its developmental sequence has been established according to the larvas which the sicula and proximal rhabdosomes are also well preserved. Meanwhile, the Oktavites spiralis and coexiting species Oktavites contortus can be further distinguished according the different morphology of the proximal rhabdosomes, which is also a key to define this genus precisely.

7 Devonian Corals from Zhaotong, NE Yunnan (II) ——Givetian Rugose Corals

Liao Wei-hua , Ma Xue-ping

2017, 56(1):68-81. CSTR:

[Abstract](326) [HTML](0) [PDF 0.00 Byte](5)

Abstract:
A relatively complete and extended Devonian shallow marine sequence crops out in the vicinity of Qingmen village in the northeastern suburb of Zhaotong, Yunnan Province. Lower to Upper Devonian strata are all exposed, with abundant shallow water benthic fossils. It is an ideal area for Devonian studies in the northeastern Yunnan Province. The stratigraphic succession has been well established, which is very thick. Nevertheless, benthic fossils have not been described. The present paper is the second of the series of rugose coral studies, dealing with late Middle Devonian (Givetian) strata and corals, with discussions on stratigraphic divisions and correlations, as well as the coral palaeobiogeographical relationship. Six genera and species have been described, with a new genus and species named. They are?Endophyllum panxiense Liao, Ma and Sun, Sinospongophyllum sp., Parasociophyllum isactis (Frech), Argutastrea endecus (Kong), Temnophyllum poshiense Wang and Dianqianophyllum bianqingense gen. et sp. nov.

8 Doubtful Cyanobacteria in the Giant Oolitic Limestone of the Lower Triassic Feixianguan Formation from the Yudongzi Section of Jiangyou, Sichuan and Two Episodes of Early Triassic Cyanobacterial Explosions

ZHOU Zhi-cheng , LUO Hui , WILLEMS H , XU Bo , WANG Xue-heng , CAI Hua-wei , CHEN Di-shu , LIU Shi-jia , CHEN Jin-hua

2017, 56(1):82-93. CSTR:

[Abstract](203) [HTML](0) [PDF 0.00 Byte](6)

Abstract:
The disaster event of marine ecological environments at the end-Permian resulted in mass extinction of marine benthic fauna and the explosion of Early Triassic cyanobacteria mainly found from microbialite. The abundant doubtful cyanobacteria are first discovered in the giant oolitic limestone of the lower part of the Feixianguan Formation. Their types and structures are very different from cyanobacteria found in the microbialite at the bottom of the Feixianguan Formation reported before. The gathering of doubtful cyanobacteria in the giant ooids and host rocks implies that the formation of the giant oolitic limestone was closely related to the doubtful cyanobacterial activities. In this case it is similar to the formation of microbialite found at the bottom of the Feixianguan Formation. It can be inferred that two episodes of Early Triassic doubtful cyanobacterial explosions occurred in this region and provide a clue that there were two events of marine ecological environmental deteriorations at least. However, the Early Triassic explosions of cyanobacteria are of benefit to improvement of marine ecological environments and biotic recovery. Therefore, it is significant for the very late Early Triassic and the Middle Triassic overall biotic recovery and radiation.

9 Fossil Plant Assemblage from the Middle Jurassic Yan’an Formation in Huating, Gansu Province and Its Paleoclimatic Implication

.LI Qi-jia , LI Jun , AN Peng-cheng , TANG De-liang , ZHU Yu-ting , DING Su-ting , WU Jing-yu

2017, 56(1):94-107. CSTR:

[Abstract](259) [HTML](0) [PDF 0.00 Byte](5)

Abstract:
On the basis of morphological and cuticle analysis, a total of 24 genera and 49 species of plant fossils were identified from the Middle Jurassic Yan’an Formation of Huating, Gansu Province. The results show that Ginkgopsida (38.8%) and Filicopsida (28.6%) are dominated in this flora, Coniferopsida (16.3%), Sphenoposida (8.2%) and Cycadopsida (4.1%) have an important proportion while Lycopsida and Pteridospermopsida are absent. On the basis of the comparison of fossil compositions with other Jurassic floras, including 11 Middle Jurassic floras from North China which had been investigated in detail by previous researches, we conclude that the present Yan’an Formation flora of Huating belongs to the early assemblage of the Coniopteris–Phoenicopsis flora in North China, with a geological age of Middle Jurassic (likely Aalenian to Bajocian). Meanwhile, most species from the Yan’an Formation were distributed in a zone of warm and humid conditions with some exceptions that existed in tropical or subtropical zones. Therefore, the regions of Huating, East Gansu Province might have experienced a humid and warm–temperate climate during the Middle Jurassic.

10 Relationships between Vegetation and Stomata, and between Vegetation and Pollen Surface Soil in Taibai Mountains

.LI Yong-fei , LI Chun-hai , XU Liu-yuan , XU Bin , Pang You-zhi

2017, 56(1):108-116. CSTR:

[Abstract](282) [HTML](0) [PDF 0.00 Byte](5)

Abstract:
In this paper 13 surface pollen samples from different communities are analyzed for relationships between vegetation and stomata, and between vegetation and pollen surface soil in Taibai Mountains. We have found that pollen assemblages of deciduous and coniferous forests seem to correspond very well with the incorporated characteristics of vegetational community, deciduous forest and conifer pollen assemblages may represent their communities moderately, and alpine meadows pollen assemblages are not well associated with their numerical characteristics of plant community. Pinus, Tsuga and Betula are over-represented, and Juglans and Ulmus are moderate representative, whereas Larix, Abies, Ericaceae and Acer are under-represented pollen taxa. In addition, DCA (Detrended Correspondence Analysis) is moderately effective in distinguishing different plant communities, and can reflect accurately their vegetational characteristics with the help of stomata.

Volume 56,Issue 1,2017 Table of Contents

Current Issue

Volume

Issue

Most Read

Most Cited

Most Downloaded

WeChat

Mobile website