摘要
一、四川盆地西部卡尼期地层分区四川盆地西部北起广元南至峨眉出露一套晚三叠世卡尼期地层。但这套地层的分层问题争论已久,尚未解决。笔者认为只有将化石组合对比与沉积相对比结合才可能更容易解决这一问题。现将其大致划为3个沉积相区: 1.中部沉积相区处于古海湾中部,北起江油县黄连桥,南至什邡县金河。由成都地质学院及国家地质总局第二普查勘探大队合组的川西北石油一队于1975年在本相区建汉旺组。该组下段以黄连桥剖面为代表,厚90m。
A suite of Late Triassic Carnian strata is exposed in the western part of the Sichuan Basin, from Guangyuan county in the north to Emei county in the south, The subdivision of the strata has long been in debate up to now. The author considers that by combining the correlation of fossil assemblages with that of sedimentary facies, this problem can be solved more easily. It has been found that three different formations (bearing the names of Hanwang, Ma'antang and Kuahongdong) and their originating profiles, founded by predecessors for the suite of Carnian strata are separately located in three different sedimentary facies regions of the Carnian gulf. By way of correlating the sedimentary facies, one can easily make clear the interrelationship between the horizons of the three formations. A lot of sponge fossils have been found in the Upper Member of the Carnian strata. This paper lays much stress on the systematics for the members of Lyssacinosa in Hexactinellida, which have been found in large amounts in this region. Since very few fragments and spicules of Lyssacinosa have ever been found in the Late Triassic strata of the world before (Hartman and others, 1980; Mostler, 1978), the discovery of Carnian fossil Lyssaeinosa in this. region is of great significance. The fossils include 1 new family, 8 new genera and 8 new species, which are listed as follows: Keriogastrospongiidae fam. nov. Keriogastrospongia gen. nov. Keriogastrospongia phialoides gen. et sp. nov. Clossospongia gen. nov. Glossospongia angustoscula gen. et sp. nov_Crepospongia gen. nov. Crepospongia circulana gen. et sp. nov. Oospania gen. nov. Oospongia radiocanalis gen. et sp. nov. Calpidospongia gen. nov. Calpidospongia rhynchoprocta gen. et sp. nov_ Pyrenospongia gen. nov. Pyrenospongia omalohemisphaera gen. et sp. nov_Lecanocoelospongia gen. nov. Lecanocoelospongia brachystypos gen. et sp. now. Placospongia gen. nov. Placospongia annulicarina gen. et sp. nov.
出处
《古生物学报》
CAS
CSCD
北大核心
1989年第6期766-772,833,共7页
Acta Palaeontologica Sinica
基金
国家自然科学基金
