Permian radiolarians are detected from cherts of the Tamba Terrane in the Nishizu district， southwestern Fukui Prefecture. The Tamba Terrane exposed in the district is mainly composed of basalt， limestone， chert， mudstone and sandstone. It is characterized by a chaotic mixture of these rocks; i.e.， slabs of basalt， limestone， chert， mudstone and sandstone are embedded in pelitic mixed rocks. Only a few biostratigraphical studies in the district have previously been appeared and some of them described the occurrence of Permian， Triassic and Jurassic radiolarians，but the ages of the rocks constituting the Tamba Terrane in the district are still uncertained. Newly recovered radiolarians treated herein can give the chert sequence in the Nishizu district additional ages of late Early， middle Middle and middle Late Permian. Moreover， cherts generally occur as slabs， which are classified into small-scale lenticular and large-scale sheet-like types， both of which are assigned to Permian in age.
Temperature-depth profiles and groundwater levels were measured on 88 observation wells in the Kanto Plain. From observation results， subsurface temperature distribution in the Kanto Plain is assumed to be strongly affected by thermal advection due to groundwater flow， which has regional difference between high temperature area and low temperature area. The high temperature area is located in a low land around the Kinu， Tone Rivers and central part of the Kanto Plain. The low temperature area， on the other hand， is located in a high land and/or a mountain area around the Kanto Plain. Considering from observed distribution of subsurface temperatures and hydraulic heads， two local groundwater flow systems which discharge to the Tone River in Gunma Prefecture and to the Kinu River in Tochigi Prefecture， and one regional groundwater自owsystem which recharged in the peripheral area in the plain and discharges to central part of the plain are estimated. Moreover， there are subsurface temperature inversions in shallow layer due to the eｆｆect of surface warming. The distribution of inversion in the Kanto Plain has tendency that the depth of inversion in the recharge area is deeper than that in the discharge area， and this tendency suggests the existence of the regional groundwater flow system in the Kanto Plain.
The fission track dating was applied for the Kt-7 Tuff， interbedded in the uppermost part of the Miocene Kubota Formation in the eastern Tanagura area， Northeast Japan. The fission track age of the Kt-7 Tuff (10.6±0.3Ma; 1σ error) is almost equal to the K-Ar and fission track ages of the Kt -1 Tuff， interbedded in the lowest part of the Kubota Formation. These radiometric ages show good agreement with the previously established calcareous and siliceous microfossil biostratigraphy. The integrated stratigraphy based on microfossils as well as K-Ar and fission track ages indicate a high sedimentation rate of the Kubota Formation.
Tsukaharano debris avalanche deposit of 0.3 km3 was derived from Kyogatake V olcano which forms an andesitic cone of middle Pleistocene. The avalanche deposit spreads over the southwestern foot of the volcano， reaching as far as 11 km and 1.4 km down from the source Kyogatake. The deposit forms a debris plateau called Tsukaharano which is 10-25 m high and 2.5 km square， and is accompanied with many hummocky hills. The deposit consists of a chaotic mixture of mostly fumarolic altered lava and fragile pyroclastic rocks which often forms flameshape blocks showing imbricate structure. The avalanche was associated with neither magmatic nor phreatic eruption. 14C ages of peat soils on and under the avalanche deposit show ages about 5 and 6.7 ka respectively. They are much younger than the active time of the source volcano. Most likely an earthquake caused the avalanche.
Three K-Ar ages were measured on the volcanic rocks along the Quaternary volcanic front of NE Japan. The results are 2.3 Ma on Nanatumori volcanic rock， 1.7 Ma on Kamurodake Volcano and 0.7 Ma on Aoso Volcano. These data suggest the volcanic front moved to the present location from the east to the west after about 2 Ma. The same movement of the volcanic front is recognized in the Fossa Magna region， central Japan， which is the southern extension of the volcanic front of NE Japan.
Zinc-bearing actinolite was found in a hydrothermal vein of a drill core retrieved at 1，223 m in depth of the deep research well， WD-1， which had been drilled in the Kakkonda geothermal area， northeastern Japan. Zinc-bearing actinolite is fibrous and occurs with sphalerite，chalcopyrite， pyrite， quartz， anhydrite， epidote and clay minerals in the vein. The ZnO content of actinolite ranges in 0.4-1.5 wt.%， relatively high compared with zinc-bearing calcic amphiboles in previous reports. The actinolite was possibly formed from zinc-rich hydrothermal fluid at early stage of geothermal activity in Kakkonda.