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basic information of the underground, but also are the distinguished products of Type 1 Basic Researches that contribute to the construction of knowledge system [2][3]. Geological maps are always compiled based on the latest geological model of the time. Since new geological models emerge with the progress of geology, it often happens that two maps compiled at different periods, even though they are adjacent, may be represented by different geological divisions and/or legend, and the distribution of formations may be discontinuous. Because of such inconveniences, we are faced with growing need to revise and update these geological maps made at different ages with latest model and knowledge obtained in field surveys. Expanding this operation nationwide will make geological maps more useful and helpful in our society. Likening the situation where current research become outdated and inapplicable as time goes by to the "valley of death" in research, we must promote Type 2 Basic Research to make past accomplishments more valuable and escape this situation. The research of seamless geologic maps aims to recreate valuable geoinformation for society. This study contributes not only to the development and management of useful geoinformation, but it also develops both Internet deliverable technologies that facilitate wider use of geological maps and standardization of interoperation among different spatial information. We also intend to develop, deliver, and utilize the information through the network in and outside Japan to provide Full Research. Upto-date web delivery technologies can be applied to seamless geological map, to make data compliant to international standards. This is expected to stimulate faster and broader distribution of detailed and precise geoinfor mation.

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