准噶尔南缘—吐鲁番盆地晚二叠世—中三叠世早期二齿兽类的发育及生态环境探讨

准噶尔南缘—吐鲁番盆地晚二叠世—中三叠世早期地层中,共有5个岩组发现有二齿兽类化石.这些二齿兽类生活在河流—浅水湖泊的古地理环境中,伴随的古气候条件为热带—亚热带气候.该时期的“红层”可以作为热带—亚热带气候的标志之一.

Large Tetrapod Burrows from the Permian Naobaogou Formation of the Daqingshan Area, Nei Mongol, China

Two new tetrapod burrow casts from the Naobaogou Formation （Middle or Late Permian） of Nei Mongol,China are described.It marks the first pre-Cenozoic tetrapod burrow from China,and one of the earliest records of tetrapod burrows.Comparison to other Permian and Triassic burrows suggests that these burrows were created by tetrapod slightly smaller than Lystrosaurus.Deduced from the morphology and sizes of two burrows and known tetrapods of the Naobaogou Formation,the burrow should be the production of a therapsid,most likely a dicynodon.These burrows indicate a seasonal climate and this area was semiarid or arid during that time.

袁复礼对中国地质科学发展的贡献

袁复礼教授(1893—1987),中国著名的地质、地理和考古学家。早年留学美国,回国后长期任清华大学教授兼地学系系主任,其间参加了著名的中瑞西北科学考察,在考察中发现大量动物和植物化石,尤其在新疆发现二齿兽和水龙兽等冈瓦纳大陆大型爬行动物化石,贡献卓著。他毕生从事地质调查和地质教育事业,笔者从其参与创建中国地质学会、西北科学考察、清华大学任教、考古发掘、第四纪地质与地貌学研究、矿产资源调查等方面阐述袁复礼对中国地质科学发展的贡献。