海南“三亚人”遗址1992年发掘报告

本文记述的是海南三亚发现的石器时代洞穴遗址,地质时代为晚更新世末或全新世初期。哺乳动物组合为东洋界动物群,石制品在类型上或加工方式上与两广地区相同时代的文化类型比较接近。人类牙齿属晚期智人。     

江西新余发现的旧石器

本文报道的旧石器材料来自余市郊,袁河第二阶段地红色粘土层,根据地貌,地层与石制品的特征,初步推定石器地点的地质时代为晚更新世晚期,即考古学上的旧石器时代晚期。     

广东封开县罗沙岩洞穴遗址第一期发掘简报

封开罗沙岩第一期发掘,出土了一些打制石器,它们有明确的地层,并有绝对年代测定数据,有助于解决广东是否有旧石器文化的争论。     

A review of selected triassic to Early Cretaceous ferns

After becoming nearly extinct during the Permian, the ferns began a slow recovery during the Triassic as the climate of the earth moderated. As a result, a considerable number and variety were present and widely distributed during the Jurassic and Early Cretaceous. However, with the rapid expansion of the angiosperms during the Late Cretaceous, the ferns once again became reduced in variety and greatly restricted in distribution. Some of the Mesozoic ferns are rather primitive and obviously are closely related descendants of Paleozoic taxa. Such ferns are assigned mostly to the Marattiaceae, Guaireaceae, Osmundaceae, and Gleicheniaceae. The majority of the Mesozoic ferns, however, are distinctive and appear to have originated during that era. These fossil ferns generally fit into modern orders and families such as the Matoniaceae or the Dipteridaceae. In some cases, it is difficult to clearly distinguish some of the Mesozoic ferns from living genera. A portion was presented as an invited paper to the symposium: Evolution of pteridophytes and gymnosperms at the XV International Botanical Congress, Yokohama, Japan (1993).     

Biomarker indications for microbial contribution to Recent and Late Jurassic carbonate deposits

Summary Biomarker investigations were applied to the hydrocarbon fractions of three Recent (cyanobacterial mat, Lake Van microbialite and Lake Satonda microbialite) and two Late Jurassic carbonate samples obtained from sponge bioherms. The relative concentrations ofn-alkanes, monomethyl alkanes, acyclic isoprenoids, steroids and hopanoids in these samples are studied and their probable biological precursors are discussed. Normal alkanes with carbon chain lengths ranging from C₁₅ to C₃₄ and monomethyl alkanes ranging from C₁₇ to C₂₁ with a varying methyl branching pattern are found. The major hydrocarbons are low molecular weight (LMW)n-alkanes (C₁₅–C₂₁) with a slight to strong predominance ofn-heptadecane (C₁₇). High molecular weight (HMW)n-alkanes occur in low to moderate relative concentrations showing a preference of odd-carbon numbered compounds with a maximum at C₂₉. Within the acyclic isoprenoids, pristane, phytane/phytene, pentamethyl-eicosane, squalane and lycopane could be identified. Polycyclic terpenoids of the sterane and/or hopane type are present in all carbonate samples. The carbon numbers of these components range from 27 to 29 and 27 to 32, respectively. These organic compounds identified can be attributed to various source organisms such as cyanobacteria, archaebacteria, algae and vascular plants. All hydrocarbon fractions of the samples are characterized by moderate to high relative concentrations of compounds derived from cyanobacteria, signifying the role of these organisms as contributors to the Recent as well as to the Late Jurassic carbonate deposits.     

福建永安丰海二叠系上部及三叠系底部的双壳类动物群*

系统研究了闽西永安丰海地区二叠系上部及三叠系下部的双壳类动物群面貌、层位及组合,并与国内外相当的地层进行了对比,阐明了该双壳动物群在二叠-三叠系界线划分中的地层意义.描述了15属24种(其中5新种)、5未定种.     

川西峨眉晚白垩世夹关期河流沉积中的痕迹化石群落*

晚白垩世夹关组中的痕迹化石群落至少由12个痕迹属17个痕迹种组成,其中包括5个新痕迹种,即Cystichrtium cuwatitivum,Steinichnus laryus,Paradidymaulichnus emeiertsis,Monmorphichnus lineates和Rusophycus univalvis.这一化石群落主要是无脊椎动物的进食迹、觅食迹、爬迹、停息迹和居住迹,其中多数呈下浮痕和全浮痕保存,并形成于经常干旱的河流环境(大多出现在泛滥平原沉积中).该群落可识别出两个痕迹化石组合,即1) Scoyenia-Steinichnus-Rusophycus组合,它主要产自泛滥平原和漫滩环境;2)Skolithos-Arenicolites组合,它代表一种水道砂坝或曲流砂坝环境.     

石炭纪一植物新属Reticalethopteris gen.nov.——对Palaeoweichselia yuani Sze的再研究

对北祁连山东段和鄂尔多斯西缘新材料的研究表明,甘肃景泰红水堡晚石炭世早期的杂羊齿属(Palaeoweichselia)与西欧的模式标本存在明显差异,遂另建-新属——Reticalethopteris gen.nov..新属与Neuralethopteris是脉延羊齿类植物中分别代表网状叶脉和羽状叶脉的一对姐妹属.     

论晚二叠世的“克氏蛤”

系统评述目前世界上出现的晚二叠世克氏蛤类标本,并描述采自贵州,云南藏东的有关化石１属３种。其中１新属１新种,右壳足丝凹口特征在克氏蛤类研究中具有重要意义。晚二叠世的Ｃｌａｒａｉｏｉｄｅｓ ｇｅｎ．ｎｏｖ．以足丝凹口内端明显向腹方或后腹方扩展膨大成足丝凹湾而不同于早三叠世的Ｃｌａｒａｉａ．后者似由前者演化而来,它们在二叠－三叠系界线附近发生替代,可能与古生代末的绝灭事件相关。     

贵州盘县新塘晚石炭世的四射珊瑚

文章通过贵州盘新塘原下二叠统下部紫松阶珊瑚化石的分析,将该地层划归上石炭统上部。描述上炭统威宁阶,过岩阶和紫松阶的四射珊瑚６属７种,其中５新种,通过对这些珊瑚的形态构造进行了剖析,略述了该地区在晚石炭世的环境特征。