A study on Permian Solitary corals of Japan

I.从北上、阿武熊、希达和中国山的二叠纪采集了孤立珊瑚。它们主要产于灰岩相，其次为钙质砂岩和页岩相。非钙质相的产量是极其罕见的。II.珊瑚生产层位范围从早二叠世到晚二叠世。但是，如果将二叠纪划分为3个部分，则上部的珊瑚出现很少。这也与相控效果有关。以北上山脉的地层序列为标准，坂本泽组和卡诺仓组及其对应组的珊瑚产状相当丰富，而丰山组的珊瑚则很少。因此，人们认为北上山脉的沉积环境在丰马时代前后由陆棚相转变为斜坡相。如上所述，珊瑚的出现一定受到这种现象的影响。上二叠统或最上二叠统的发育受到很大限制， ...更多信息 在其他地区亦未能从有关海平面采集到珊瑚。三、已发现的单生珊瑚属的地层分布为：Lophophyllidium、Lophocarinophyllum、Duplocarinia、Amandophyllum、Yabeiphyllum、Laophyllum、Iranophyllum、Sakamotosawanella，它们来自Sakamotozawa组及其相应的组：Cyathaxohia、Calophyllum、Verbeekiella、Lophyllidium、Ufimia？和Iranophyllum从Kanokura组及其等价物：只有一个样品从Toyoma组。IV.从dissepimented孤立的皱纹珊瑚，特提斯和北方型的形式是已知的共存下坂本泽组。但后来直到卡诺库拉时间只有特提斯珊瑚出现。至于所谓的Cyathaxonia动物群，没有或很少有地方性。虽然Verbeekiella和Duplocarinia最初被描述来自帝汶属于特提斯领域，其余的是或多或少世界性的性质。V.许多保存完好的个人收集Verbeekiella其中包含2种：其中一个是新种。从个体发生学的研究，这一新的形式，缩短主隔膜发生在早期的生长阶段，从而表明了一个独特的地位，这一组皱纹的单倍型。多叶虫是罕见的，没有得到充分的研究。少

I.Solitary corals were collected from the Permian of the Kitakami, Abukuma, Hida and Chugoku mountains. They occur mostly in limestone facies, followed by calcareous sandstone and shale facies. Yield from non-calcareous facies is extremely rare.II.Coral producing horizons range from the earliest Permian to the late Permian. However, if we divide the Permian into 3 parts, the coral occurrence from the upper part is rare. This is also related to the result of facies control. Taking the stratigraphic succession in the Kitakami mountains as standard, the occurrence from the Sakamotozawa and Kanokura Formations and their equivalents is fairly rich ; whereas corals are rare in the Toyoma Formation. It has been so considered that the sedimentological environment shifted from shelf to slope facies in the Kitakami Mountains at around the Toyoma Time. Coral occurrence must have been influenced by this phenomenon, as stated above. Development of the Upper or Uppermost Permian is much restricted a … More lso in the other areas, where no corals were obtainable from the horizons concerned. Therefore coral assemblage near or at the Terminal Permian can not be investigated in Japan.III.Stratigraphic distribution of detected solitary coral genera is : Lophophyllidium, Lophocarinophyllum, Duplocarinia, Amandophyllum, Yabeiphyllum, Laophyllum, Iranophyllum, Sakamotosawanella from the Sakamotozawa Formation and its equivalent formations : Cyathaxohia, Calophyllum, Verbeekiella, Lophophyllidium, Ufimia? and Iranophyllum from the Kanokura Formation and its equivalents : Only one sample from the Toyoma Formation.IV.Viewed from dissepimented solitary rugose corals, both Tethyan and Boreal type forms are known to coexist in the Lower Sakamotozawa Formation. But later on until the kanokura Time only Tethyan corals occur. As to the so-called Cyathaxonia fauna no or little provinciality is detectable. Although Verbeekiella and Duplocarinia were originally described from Timor belonging to the Tethyan Realm, the rest is more or less cosmopolitan in nature.V.Many well-preserved individuals were collected for Verbeekiella which contains 2 species : among them one is a new species. From the ontogenetical investigation of this new form, shortening of cardinal septum occurs from the early growth stage, thereby indicating a unique position of this group in the rugosan phylogeny. Plerophyllids are rare and not fully investigated. Less