Table of Content

15 March 1997, Volume 35 Issue 01

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RESTUDY OF THELODONT MICROFOSSILS FROM THE LOWER PART OF THE CUFENGSHAN GROUP OF QUJING, EASTERN YUNNAN, CHINA

WANG NianZhong

1997, 35(01):  1-17. 

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The Cuifengshan Group is generally subdivided into four formations in ascending order: the Xishancun, Xitun, Guijiatun and Xujiachong formations. The rocks of the group are depositionally continuous between the formations and with the underlying Yulongsi Formation. Previously, this lower part of the Cuifengshan Group (the Xishancun and Xitun formations) was placed in the Lower Devonian by many workers based mainly on the age of the underlying and overlying strata. The new thelodont genus Pdrathelodus including four new and one old species must be a transitional type between Thelodus and Turinia. As it is known, Thelodus ranges generaly from Middle Wenlockian to Middle Pridolian, but Turinia is confined to Early and Middle Devonian (Gross, 1967; Turner, 1973, 1991; Talimaa, 1978; Märss, 1986). According to the transitional feature of the new genus, Parathelodus ranges probably from Middle Pridolian to Early Lochkovian. The age of Parathelodus—bearing strata in the lower part of the Cuifengshan Group of Qujing could be Middle and Late Pridolian, because a more important argument is that Parathelodus scitulus WI. et sp. nov. discovered in lower part of the Cuifengshan Group, associated with Devonian thelodont Turinia sp. and Canonia sp. and conodont zone Icriodus woschmidti was also found in the marine Lower Putonggou Formation of Early Lochkovian age in the West Qinling Mountains, Gansu Province, North China (Wang N Z, 1995a). The new thelodont materials were recovered from 14 horizons in the lower part of the Cuifengshan Group. Based on the new thelodont and other fossil findings, the Siluro — Devonian boundary in Qujing area could be drawn at the middle part of the Xitun Formation of the Cuifengshan Group. Three new vertebrate assemblages from Ludlovian to early Emsian strata of Qujing can be established in ascending order: the Hanilepis—Naxilepis Assemblage from the Guandi, Miaogao to Yulongsi (except for the upper black shale) formations; the Parathelodus—Polybranchiaspis Assemblage from the upper black shale of the Yulongsi Formation to the middle part of the Xitun Formation and the Sanchaspis— Gantarostrataspis Assemblage from the Xujiachong Formation.

THE MACROPETALICHTHYIDS (PLACODERMI) FROM GUANGXI AND HUNAN, CHINA

Jl Shu'an, PAN Jiang

1997, 35(01):  18-34. 

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Since Neopetalichthys and Quasipetalichthys were referred to Order Petalichthyida by Liu (1973) for the first time, more and more remains of this group have been reported in China. And today, South China is considered as an important biogeographical province of petalichthyids in the world. In the present paper, two new species of Guangxipetalichthys gen. nov., which excavated from Bobai, Guangxi and Tiaomajian, Hunan respectively, are systematically described.

A NEW GENUS OF PRIMITIVE DINOCEPHALIAN —THE THIRD REPORT ON LATE PERMIAN DASHANKOU LOWER TETRAPOD FAUNA

CHENG Zhengwu, LI Jinling

1997, 35(01):  35-43. 

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Material of the Late Permian Dashankou fauna was collected from a quarry at Yumen, Gansu, Northwest China. Significance and composition of the fauna, stratigraphical and lithological characters of the fossil — bearing beds have been previously demonstrated in the several papers (Cheng et al., 1996; Li and Cheng, 1995; Cheng and Ji 1996). Based on some excellent preserved specimens, the second genus of Dinocephalia in the fauna, following the first one, Sinophoneus Cheng and Ji, 1996, is described in the present paper.

MAMMALIAN FOSSILS FROM SANSHUI BASIN, GUANGDONG, CHINA

WANG Banyue, ZHANG Wei

1997, 35(01):  44-48. 

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A left upper molar (IVPP VI 1197) and a fragment of lower jaw, two vertebrae and some ribs (V 12180) were collected from Formation I of the Buxin Group in Sanshui Basin, Guangdong Province, China. The lower jaw is more similar to that of Bemalambdidae than to other mammals as evidenced by its robust body, deep mandible symphysis with rather steep anterior border, presence of three pairs of incisors, a large c and especially a long diastema between c and p2, which is one of the distinctive features of Bemalambdidae. The upper molar is also similar to that of the Bemalambdidae in being proportionally wide and short, with a wide stylar shelf, developed parastyle and metastyle, and a V —shaped protocone. The specimens from Sanshui are more similar to those of Hypsilolambda than to Bemalambda in lacking a distinct antero —external border on the lower jaw and having a forked and V —shaped parastyle on the upper molar. Hypsilolambda is known to include two species: H. chalingensis and H. impensa. The Sanshui specimens are much larger and robuster than both of them. The molar is also much wider in proportion. They may represent a new species of Hypsilolambda, or even a new genus, At present we tentatively assign it to Hypsilolambda as？Hypsilolambda sp. The deposits bearing the mammal fossils was named as Formation I of the Buxin Group. Recently it was suggested to be transferred to middle Eocene Baoyue Formation. The Bemalambdidae are only known from early一middle Paleocene. Hypsilolambda is only known from middle Paleocene. Therefore, the age of the fossil一bearing deposits is unlikely Eocene, but Paleocene. As for the stratigraphic terminology of the deposits, it seems better to keep the original one, Formation I Of the Buxin Group.

MAMMALIAN REMAINS FROM THE LATE PALEOCENE OF GUICHI, ANHUI

HUANG Xueshi, CHEN Liezu

1997, 35(01):  49-67. 

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In the western part of Tongling Basin, on the southern bank of the Yangtze River, lies the Meigeng area of Guichi County, Anhui Province. Here is exposed a series of red strata from which local geologists recovered mammalian fossils in the 1980s. Two species of Pantodonta, including a new one, and one species of Notoungulata are currently recognized in the Guichi Fauna. Discussion of the fossil —bearing beds is also presented herein.

A NEW BRONTOTHERE FROM LATE MIDDLE EOCENE OF QUFU, SHANDONG

WANG Yuan, WANG Jingwen

1997, 35(01):  68-77. 

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The brontothere fossil described herein was collected in 1984 by the second author from Huangzhuang Formation of Qufu, Shandong, China. Huangzhuang fauna, first reported in 1985, was regarded as Sharamuranian age, comparing to Late Uintan of North America (Sha & Wang, 1985; Shi, 1989; Tong, 1989; Wang, 1994). A few unrecognized brontothere materials have been reported from Qufu and Xintai of Shandong Province (Shi, 1989; Chow & Qi, 1982). Our specimen preserves the anterior part of a skull with almost complete upper dentition. This is the first recognizable brontothere genus from Shandong Province, and also a relatively complete material reported in China in recent years. We propose a new genus and species and refer it to subfamily Metatelmatheriinae.