ON THE IZUMI SANDSTONE GROUP

泉砂岩群由日本诸岛白垩纪沉积组成，呈带状沉积，呈东西走向，长约500公里。从泉美山兰根基半岛到龟须市，本文尝试了以下五个新证据的描述：1)IWAKIJI植物群：该植物群显示落叶锦鸡叶相，是在雅潘的上白垩世最重要的植物群之一。2)在古生态学家看来，该化石属被一些古生态学家认为是LEBENSSPUPEN，但它具有植物学证据。然而，作者认为，在这些岩石的某些部分，它是不确定的物质。3)在这个群的西部，有深源安山岩的变质条件。在这个群的西部地区：这个群的西端在爱亨县麻河町的青岛已知。但它的范围在九州境内的文戈-绥都海峡(海峡)之上。5)这个群的构造：这个群被南北向的TRDNDING断层隔开六个街区。在东侧的俯仰旋回结构中发现了这些短柱。

IZUMI SANDSTONE GROUP HAS LONG KNOWN TO BE FORMED OF THEUPPER CRETACEOUS DEPOSITS IN THE JAPANESE ISLANDS; AND IT SHOWS A BELT-LIK SEDIMENTED ROCKS, AND TRENDS THE EAST-TO-WEST WITH THE LENGTH OF 500 KM. FROM THE IZUMI MOUNTAIN RANGEIN KII PENINSULA TO USUKI CITY IN KYUSHU.IN THIS REPORT, THE WRITER TRIES A DESCRIPTION ON FIVE NEW EVIDENCES,AS FOLLOWS;1) IWAKIJI FLORA: THIS FLORA SHOWS THE DECIDUOUS BROARD LEAVES FACIES, AND IS THE ONE OF THE MOST IMPORTANT FLORA OF THE UPPER CRETACEOUS IN JAPAN.2) ON THE ARCHASEZOSTERA: THIS FOSSIL-GENUS HAS BEEN CONSIDERED A LEBENSSPUPEN BY SOME PALAEOECOLOGISTS,BUT IT SHOWS A BOTANICAL EVIDENCE. HOWEVER, THE WRITER CONSIDERS THAT IT IS INCERTITUDE MATTER ON SOME PARTS OF THESE FOSSILS.3) METAMORPHOSED CONDITION BY THE INTRUSIVED PLOCENE ANDESITIC ROCKS: IN THE WESTERN PART OF THIS GROUP. IT HAS BEEN FOUND IN THE HORNFELS-LIKE ROCKS BY SOME INTRUDING OF ANDESITIC ROCKS.4) ON THE WESTERN AREA OF THIS GROUP: THE WESTERN-END OF THIS GROUP AHS BEEN KNOWN AT AOSHIMA, MAGAHAMA-CHO, EHIME PREFECTURE. BUT ITS AREA EXISTS OF TREDING IN KYUSHU OVER THE BUNGO-SUIDU(CHANNEL).5) STURUCTURE OF THIS GROUP: THIS GROUP IS SEPARATED SIX-BLOCKS BY THE FAULTS OF TRDNDING OF THE SOUTH -TO-NORTH. AND IN THESE BOLCKS WERE FOUND IN THE PITCHING CYNCLINAL STRUCTURE IN THE EASTWARD.