As a result of writer's recent study on the geology of the Senkaku Retto (Uotsuri-jima, Kita-ko-jima and Minami-ko-jima), a summary of conclusion is led as follows. 1. The following stratigraphic division (in the decending order) is recognized in the Uotsuri-jima and its adjacent area of the Senkaku Retto. Geologic age Stratigraphic division Geologic relation Recent Alluvial bed and talus deposit Raised coral reef Miocene? Intrusive igneous rocks Uotsuri-jima formation unconformity unconformity intrusion The geologic map of the Uotsuri-jima and its adjacent area is shown in Fig. 2. 2. The Uotsuri-jima formation is mainly made of sandstone with intercalation of conglomerate, rarely with thin coal bed and siltstone. 3. The Uotsuri-jima formation shows a trend of SW-NE, EW and NW-SE strikes, and generally inclining at the angle of less than 20° N. It indicates dome structure in the Uotsuri-jima, and slight folding in other islands. 4. Intrusive igneous rocks, such as hornblende dioritic porphyrite and its associated rocks, occur as intrusive sheet in the Uotsuri-jima formation of the Uotsuri-jima and Minami-kojima. Essential constituent minerals of these rocks are hornblende, plagioclase and magnetite phenocrysts or microphenocrysts. The groundmass showing horocrystalline texture is composed of hornblende, plagioclase, quartz, magnetite and secondary minerals viz. calsite, chlorite and other clay minerals. 5. The chemical and normative mineral compositions of intrusive igneous rocks are shown in Table 2. As seen from the Table, they are generally rich in Al2O3, Fe2O3, MgO and CaO contents, while poor in FeO, total FeO, TiO2 and K2O contents. 6. The natural remanent magnetic properties of intrusive igneous rocks from the Senkaku Retto are shown in Table 3, and also their stereographic projections in Fig. 7. That indicates just four samples (no. SU-1 in the Uotsuri-jima) are magnetized reversely, while others are normally. Since intrusive igneous rocks show no signs of structural change after they were emplaced in situ, there is estimated to be at least two activity stages of them.
The jointed area between the Eastern Hindu Kush and the Western Karakoram is called The described area is situated at the Eastern Hindu Kush range, and situated at the western part of this Syntaxial area. As a result of writer's study a summary of conclusion is lead as follows. 1. At present time, between the Upper Tirich glacier and the Lower Tirich glacier is separated by each moraine, namely, end moraine of the Upper Tirich glacier and side moraine of the Lower Tirich glacier is not continuous. Therefore, borth of the Upper and Lower glaciers are independent glacier. The Istor-O-Nal glacier is divided into two parts by a large fence, the Upper and Lower, which is called the Istor-O-Nal Upper glacier and Istor-O-nal Lower glacier. 2. The results of writer's measure the mountain, surrounding the Tirich Mir glacier by the Transit Compass, are shown in Table 1. which are included 30 points of new altitude. 3. The following stratigraphic division (in the descending order) is recognized in this area Geologic age Stratigraphic division Geological relation Recent Alluvial bed and Glacial deposit unconformity Pleistocene Terrace deposit and Glacial deposit unconformity Tartiary Tirich Mir granite intrusion Cretaceous Resun group clino-unconformity Green series fault Permian and Carboniferous Chitral group Atak subgroup unknown Zani subgroup unknown ? Momi gneiss 4. A tentative plan of the geological correlation in the Eastern Hindu Kush and the Western Karakoram are shown in Table 3.
