Jurassic stratigraphy in North America has been recently promoted by IMLAY, FREBOLD and many other geologists. It seems important for Japanese stratigraphers to recognize the present status of the Mesozoic geology in North America especially its Pacific side, since Japan belongs also to the Circum-Pacific mobile belt which suffered somewhat similar orogenic disturbances in Mesozoic times. In this paper are summerized the stratigraphy, palaeogeography and tectonics concerning Jurassic rocks in Alaska, Canada and the United States (exclusive of the Gulf region) on the basis of such recent works, and compared with those in Japan. In North Alaska and Rocky regions the sedimentation was done under relatively calm and stable condition. But in many areas of South Alaska, the Canadian Coast Range and Sierra Nevada the Jurassic succession is fairly variable, of geosynclinal characters and the total thickness often excesses 5, 000 meters. The Jurassic period is generally recognized to be calm one without any strong orogenic disturbances in Japan and most countries, but in the Pacific coast of North America “Nevadan Orogeny” with initial magmatism, regional metamorphism, isoclinal folding, thrusting and batholitic intrusion took place during Jurassic and Early Cretaceous times.
This paper is the record of the Alexander von Humboldt Centenary Fesitival at Berlin on 18-19th May 1959, 32nd German Geographical Congress on 20-24th, and the author's round the world travel, May to July of the same year. 1) Tokyo-Rome-Stockholm. 2) Special Commission on the 1:1, 000, 000 World Population Map of the International Geographical Union, under the chairmanship of Professor Dr. W. William- Olsson, Stockholm School of Economics. It was held at Stockholm on 13-15th May, to which Prof. Dr. F. Burg-dörfer (München), Mr. R. Perothero (Liverpool), Mr. G. Norström (Stockholm) attended. We discussed mainly on the method of absolute population distribution maps. 3) Stockholm and Uppsala. 4) Humboldt Festival and the 32nd German Geographical Congress. The Festival was held at the residence of Humboldt family at Tegel and the recently constructed Congress Hall at Tiergarten, both in West Berlin. More than 1, 000 participants, not only geographers but also scientists of various fields, diplomats, govermental officers, and others assembled. The Geographical Congress (Geographentag), including Carl Ritter's Centenary Festival, was held on 20-24th May at the Congress Hall. There were 16 selected reports on German and foreign regional geography, urban geography, geomorphology, eustatic changes, and cultural geography. A half day excursion in West and East Berlin was held on 22nd. After the Congress, three excursions in Braunschweig, Bad Harzburg, and Minden were prepared. At the festivals, Prof. Dr. H. Lautensach and Prof. Dr. C. O. Sauer were honoured with the Humboldt Gold Medal; Prof. Dr. H. W. Ahlmann and Prof. Dr. C. Troll were awarded the Ritter Gold Medal; The Ritter Silver Medals were given to Prof. Dr. J. Büdel, Prof. Dr. E. Otremba, Prof. Dr. R. Maack, and Prof. Dr. S. Kiuchi. The Geographical Society of Berlin (Gesellschaft für Erdkunde zu Berlin; President Prof. Dr. J. H. Schultze) took the best effort to organize these Meetings. 5) Excursion in Braunschweig. 6) Days in Dahlemdorf, Berlin. 7) Bonn and the University of Bonn. 8) Excursion in Rhein-Westfalen. 9) Strooll in Greater London. 10) Liverpool and Chester. 11) Flight over the Atlantic Ocean. 12) The discovery of America in 1959's. 13) University and Institutes of United States: Their environment and activities. 14) Country life in Michigan. 15) San Francisco to Tokyo. Acknowledgment: The author would like to write here his deepest gratitude to all the professors, members, and institutions which he has visited. To the Science Council of Japan, Asia Foundation, Freie Universität Berlin, International Geographical Union, Handelshogskolan i Stockholm, British Council, and other institutes, which have supported the travel, the author expresses his best regard.
Present status of the oil fields in Algerian Sahara is described for their productions, reservoir conditions and geological structures, etc. And it is discussed that deposition of paleozoic formations in shallow-sea circumstances and the continuous structure-highs in their duration had played an important role for the origin and accumulation of oil. Further, the future prospect of productions and the related political and economical problems are also examined.