Some Miocene ratite eggshell fragments from Gashunyinadege (about 17.5 Ma) and Baogedawula (7.11 ± 0.48 Ma), Inner Mongolia, China, are described. The outer surfaces of eggshell fragments from Gashunyinadege are ...Some Miocene ratite eggshell fragments from Gashunyinadege (about 17.5 Ma) and Baogedawula (7.11 ± 0.48 Ma), Inner Mongolia, China, are described. The outer surfaces of eggshell fragments from Gashunyinadege are smooth with a sting pore pattern, while their entire thickness is around 2.12 mm. In a cross-sectional view, the surface crystal layer is very thin and the ratio of cone layer to the those from Gashunyinadege, but seem much thinner and have a lower pore density. Both characteristics fit aepyornithid-type eggshells, implying that the distribution of aepyornithid-type eggshells can be extended to East Asia. The sediments at Gashunyinadege date to approximately 17.5 Ma, implying that the specimens from this locality are relatively early examples of aepyornithid-type eggshells. Aepyornithidtype eggshells seem to have appeared in Eurasia much earlier than struthionid-type eggshells. The faunal compositions in the two localities reflect gradual drying of the Mongolian plateau during the Miocene. A reduction in the number of pores 10 Ma ago, probably occurred in response to this drying process.展开更多
笔者有幸得到德国赢创德固赛（中国）投资有限公司的资助，参加了2008年6月29日至7月4日在澳大利亚布里斯班举行的第23届世界家禽大会（XXIII World＇s Poultry Congress 2008）。此次大会与第6届亚太家禽健康会方（6^th Asian-Pacific ...笔者有幸得到德国赢创德固赛（中国）投资有限公司的资助，参加了2008年6月29日至7月4日在澳大利亚布里斯班举行的第23届世界家禽大会（XXIII World＇s Poultry Congress 2008）。此次大会与第6届亚太家禽健康会方（6^th Asian-Pacific Poultry Health Congress）和第4届国际平胸鸟科学研讨会（4^th International Ratite Science Symposium）同期举行，并举办了有关展览。展开更多
基金supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(KZCX2-YW-120)the Key Laboratory of Evolutionary Systematics of Vertebrates,Chinese Academy of Sciences(2010LESV007)
文摘Some Miocene ratite eggshell fragments from Gashunyinadege (about 17.5 Ma) and Baogedawula (7.11 ± 0.48 Ma), Inner Mongolia, China, are described. The outer surfaces of eggshell fragments from Gashunyinadege are smooth with a sting pore pattern, while their entire thickness is around 2.12 mm. In a cross-sectional view, the surface crystal layer is very thin and the ratio of cone layer to the those from Gashunyinadege, but seem much thinner and have a lower pore density. Both characteristics fit aepyornithid-type eggshells, implying that the distribution of aepyornithid-type eggshells can be extended to East Asia. The sediments at Gashunyinadege date to approximately 17.5 Ma, implying that the specimens from this locality are relatively early examples of aepyornithid-type eggshells. Aepyornithidtype eggshells seem to have appeared in Eurasia much earlier than struthionid-type eggshells. The faunal compositions in the two localities reflect gradual drying of the Mongolian plateau during the Miocene. A reduction in the number of pores 10 Ma ago, probably occurred in response to this drying process.
文摘笔者有幸得到德国赢创德固赛（中国）投资有限公司的资助，参加了2008年6月29日至7月4日在澳大利亚布里斯班举行的第23届世界家禽大会（XXIII World＇s Poultry Congress 2008）。此次大会与第6届亚太家禽健康会方（6^th Asian-Pacific Poultry Health Congress）和第4届国际平胸鸟科学研讨会（4^th International Ratite Science Symposium）同期举行，并举办了有关展览。
