The Southern Kanto "dissolved-in-water type" gas-producing region, which covers Chiba prefecture, a part of Tokyo, Kanagawa, Ibaraki and Saitama prefectures, is one of the largest gas-producing regions in Japan. The methane gas from the region has no geological relation to petroleum or coal. Stratigraphically most of the gas-producing horizons in the region are restricted to the marine Kazusa group of Pliocene to Pleistocene in age. (Here, the Kazusa group denotes all the formations between the Kurotaki unconformity and the top of the Kasamori formation.) The natural gas is concentrated in a basin-like structure of the Kazusa group, being mostly dissolved in connate brine water. It can be considered that the natural gas in the Kazusa group, at least the greater portion of it, is indigenous to the group. Roughly speaking, the natural gas potentiality is highest in the southern part of the Kujukuri district, and very low both in the western half of the area of distribution of the group and in the Kisarazu-Goi district.
Judging from the geologic conditions during the deposition of the Kazusa group, such as lithofacies, depositional environments, and the modes of sedimentation of the group, the natural gas in the group was generated in the greatest quantities in the deep open-sea bottom where much argillaceous sediments were rapidly deposited. A considerable part of the gas thus generated has migrated into the porous layers in the group; however, since the time of the deposition of the group the gas has always behaved under the strong influence of the movements of the groundwater, that is, gravitative percolation of meteoric water into the strata, and compaction current in the strata. And, the movements of the groundwater have corresponded exactly to the changes in the pressure distribution of the water, which have been caused by sedimentation, deformation of the strata, and changes in paleogeography of the Kanto region ever since. Thus, the present modes of occurrence and the distribution of the natural gas in the Kazusa group can be clearly explained from the geologic conditions during the deposition of the group, and from the geohistorical factors which have more influentially controlled since the time of the deposition of the group than the former.

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The greater part of the Japanese peculiar Law System in the pre-historic era has not been made quite clear yet, because the scientific approach to the legal characters of Japanese ancient Empire, especially to the origin of her Royal Family, had been prohibited untill the end of the World War II, and besides, the feature of the Japanese peculiar law system, prior to the reception of Chinese Mother law, or Tang Empire's Law, was of no letter one.
In this article, therefore the author intends to describe some of the characters of our pre-historic Legal System exactly, above all, those of the governmental administration.
At first he explains some of the legal terms, peculiar to ancient tribes and states of Japan under the clan system, and secondly, the way of public notice of Territorial Domain and the mutual status of the ancient states. The article consists of 2 chapters.
Chapter I: The author shows a general view, adding to the Sacred Fire Worship System, which had displayed a strong power of rule in our society, and shows especially, the cohesion of the ruling system of government, with Mountain Worship and other tribal one, and thirdly, he shows the way of indication by the governmental Authority in old era of unwritten laws.
During this explanation, he tries to clarify especially significant features of the vestieges of ancient administration through pointing to the Miyo-ken Yama or Tomi-yama as the administrative and military Posts of Observation of borders on the ground of Divine Agreements between or among the parties concerned, accompanied with Ohira-yama, Divine Mountain of the proof of Peace Treaty, and moreover pointing to Kunimi-yama, Mikuni-yama. Takami-yama, Yahazu-yama and Oeboshi-yama etc.
Chapter II: In accordance with the present institution of Japanese prefectures, the author analyzes and illustrates the mutual status of each of the local states for the neighbouring states. The order of the description of each prefecture is as follows:
a) From Chishima, the kurile Islands, and Hokkaido, to the North-eastern Provinces ;
b) From the Kanto districts, the main central part of the Japanese main island, Chubu districts, or the Central Japan, and Hokuriku districts, to the Kinki districts or the Osaka, kyoto area;
c) The Chugoku and Shikoku districts;
d) The Kyushu and Okinawa districts.
Through these illustrations of every prefecture, the legal sense and terms of unwritten law system of our country in prehistoric era are explained partly, out of the remains of our past and native civilization nowadays disused.

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