摘要
一、前言广西隆林晚石炭世-早二叠世地层发育,岩相稳定,岩层连续,(竹蜓)类化石极其丰富,是研究我国南方石炭-二叠系界线理想的地区之一。董文兰、龙家荣(1977),黄志勋(1979),夏国英等(1986)先后在这一地区做过工作。1982年底,中国科学院南京地质古生物研究所石炭-二叠系界线工作小组对该地区进行了重点研究,在隆林县卜糯乡常么村附近测制了1条晚石炭世-早二叠世的地层剖面。本文研究的(竹蜓)类化石就是这次采获许多门类化石中的一部分。野外工作中得到吴望始教授等的帮助,成文过程中又受到张遴信教授的指点,蒋汉培磨制薄片,陈毅勇摄影,在此一并致谢。
In the Longlin County, Guangxi, Late Carboniferous and Early Permian marine strata are fully developed, with the Changmo section well exposed. This section is composed of grey and light grey crystalline thick-bedded to massive limestones, extensively exposed in simple structure, with the fusulinid succession appearing quite clear.
The Maping Formation of the Changmo section comprises four fusulinid zones in ascending order as follows:
1. Triticites montiparus Zone. With its lower limit marked by the first appearance of Triticites montiparus, this zone ranges from sample levels ABS61 to ABS63 (7.2m in thickness). Its fusulinids are dominated by individuals of Triticites characterized by robust chomata and simple folded septa.
2. Triticites simplex Zone. With the first appearance of Triticites simplex regarded as its lower limit, this zone ranges from sample levels ABS56 to ABS60 (5.6m in thickness). In this zone the genus Triticites is characterized by strong septal fluting and much smaller chomata, while Schwagerina, Rugosofusulina, Mccloudia, Eoparafusulina make their first appearances, but they are fewer in number and in species.
3. Pseudoschwagerina beedei Zone. This zone begins with the first appearance of Pseudoschwagerininae and ranges from sample levels ABS51 to ABS55 (8.1m in thickness), yielding a large and subspherical shell with whorls loosely coiled, together with Pseudoschwagerina, Zellia, Schwagerina, Rugosofusulina, Quasifusulina, Mccloudia and Triticites, among which Triticites is markedly reduced both in species diversity and in abundance.
4. Sphaeroschwagerina sphaerica Zone. With the first appearance of the genus Sphaeroschwagerina regarded as the lower limit, this zone ranges from sample levels ABS48 to ABS50 (4.9m in thickness). In this zone the Schwagerininae are of the more advanced type with larger shells and much stonger septal folds, while Sphaeroschwagerina has a larger and globose shell, with much thinner spirotheca.
The Carbo
出处
《古生物学报》
CAS
CSCD
北大核心
1991年第3期396-405,435-438,共10页
Acta Palaeontologica Sinica
