摘要
豫西焦作地区上石炭统太原组灰岩(L_1—L_9)中,(竹蜓)类化石丰富,根据其形态特征和内部构造分析,可分为两种不同的古生态类型,即底栖型和浮游型。前者多呈纺锤形,长纺锤形、园柱形、隔壁褶皱强烈,旋壁厚并具旋脊或轴积,主要产自 L_1和 L_6-L_9灰岩中,被解释为形成于高能的近滨环境;后者出现于 L_2-L_5灰岩中,以个体大,呈球形,隔壁平直,旋壁薄且旋脊不发育为英特征,被认为产生于低能的远滨(正常天气浪基面之下或附近)环境。
Two palaeoecological types of the Fusulinida fossils,based on their morphological features and internal structures,could be re- cognized from shallow marine limestones(L_1—L_9)of Upper Car- boniferous Taiyuan Formation of the Jiaozuo area,Western Henan: The first—benthonic type,coming from L_1 and L_6—L_9,commonly occurs as the fusoid or long-fusoid forms and there are intensely rugose septa,thick-spirotheca,chomata and axial filling in their interiors,and which is explained to form in the high energy near shore environments;the second—plankton type,occuring in L_2—L_5, is characterized by the big spherical forms in which there are platesepta and thin spirotheca but no choma,and which is regarded to produce in the low energy offshore(below fair weather wave base or near)environments.
关键词
豫西
太原组
Jing类
古生态
Fusulinida
Palaeoecology
Palaeogeographic environ ment
