Table of Content

15 December 1998, Volume 36 Issue 04

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EARLY SILURIAN CHONDRICHTHYAN MICROFOSSILS FROM BACHU COUNTY, XINJIANG, CHINA

WANG Nanzhong, ZHANG Shiben, WANG Junqing, ZHU Min

1998, 36(04):  257-267. 

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THE FIRST DISCOVERY OF SILURIAN AND EARLY DEVONIAN ACANTHODIANS FROM ZOIGE AND TEWO COUNTIES, WEST QINLING MOUNTAINS

WANG Nanzhong, WANG Junqing, ZHANG Guorui, WANG Shitao

1998, 36(04):  268-281. 

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DINOSAUR EGGS FROM XICHUAN BASIN, HENAN PROVINCE

ZHAO Hong, ZHAO Zikui

1998, 36(04):  282-296. 

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Xichuan Basin, located in the southwest of Henan Province, is an elongated basin with its longitudinal axis oriented in the northwest— southeast direction. The "red— beds " unconformably deposited on the Precambrian or Cambrian rocks are widely distributed in the basin, with a maximum thickness of over 1600m. In 1974, Upper Cretaceous dinosaur eggs were first discovered in these beds by the Twelfth Brigade, Bureau of Geology and Mineral Resources of Henan, and the egg—bearing beds were divided into three formations: Gaogou, Majiacun, and Sigou formations. After this discovery, the latter author surveyed the area, and collected two clutches of eggs and many eggshell fragments in 1975. Two years later, the Twelfth Geological Brigade collected many eggshell fragments from 9 localities (fig. l). In this paper, we characterize the dinosaur eggshell assemblages from 10 localities in the Xichuan Basin and discuss the ages of the egg—bearing beds.

MID-TERTIARY CHALICOTHERE (PERISSODACTYLA) FOSSILS FROM LANZHOU, GANSU, CHINA

QIU Zhanxiang, WANG Banyue, XIE Junye

1998, 36(04):  297-318. 

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The chalicotheres are a comparatively small group of the perissodactyles. While the functional morphology of the peculiar limb bones of the chalicotheres remains always highly attracting for the paleontologists, little attention has been paid to their stratigraphic significance. Working with the material to be described below, the authors found that the chalicotheres are among the most often encountered fossils in the Mid—Tertiary deposits in China. In addition, they evolved rapidly. This makes them important in stratigraphic analysis. For the purpose of comparison the chalicothere materials gathered from the northwest provinces of China (Nei Mongol, Ningxia and Xinjiang), both previously reported and unstudied, are carefully examined. A revision of these specimens will be given elsewhere.

NEW LAGOMORPH FROM THE MIOCENE OF NORTHERN JUNGGAR BASIN, XINJIANG, CHINA

WU Wenyu, YE Jie, MENG Jin, Bl Shundong, LIU Liping, ZHANG Yi

1998, 36(04):  319-329. 

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Four lagomorph teeth (P2dex, 2p3sin and p4/ml / m2dex) were collected from the Miocene of Northern Junggar Basin, Xinjiang during two field reasons in 1996 and 1997. These teeth were once identified as Amphilagus (Wu et al., 1998). Further study demonstrates that they represent a new form morphologically different from Amphilagus and the other related genera: the European Titanomys, Desmatolagus of Central Asia as well as Gripholagomys, Hesperolagomys and Russellagus of North America. This new form is designated as Plicalagus junggarensis gen. et sp. nov.

PALEOCLIMATIC RECONSTRUCTION USING CARBON AND OXYGEN ISOTOPES OF TOOTH ENAMEL FROM MANNALIAN FOSSILS

DONG Junshe, DENG Tao

1998, 36(04):  330-337. 

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The tooth enamel of mammalian fossil is able to be efficiently resistant to diagenesis and retains the original carbon and oxygen isotopic composition. On the basis of the analyses to the isotopic composition of herbivorous mammalian tooth enamel, the paleoclimates when these mammals. lived can be reconstructed. The carbon isotopic composition of structural carbonate in tooth enamel responds to that of dietary plants. According to this principle, the proportions of C3 and C4 plants in the terrestrial ecosystem can be estimated, which were controlled mainly by C02 atmospheric levels, moisture stress and irradiance as well as related to different latitudinal or climatic zones. The oxygen isotopic composition of biogenic phosphate in tooth enamel responds to that of ingested water from precipitation whose oxygen isotopic composition responds to temperature variations. As a result, there is an outstanding correlation between oxygen isotopic composition of tooth enamel and temperature. In the light of this pattern, the annual average temperature in the geological periods can be calculated and the climatic variation curve of cold and warn-I in the geological periods can be made.