Frontispiece 4　The uppermost part of Osawa.
Unit names are also shown at Frontispiece 2.
A: The uppermost part of Osawa looking up from the right bank. Many dikes cut horizontally stratified lava layers (August 2005).
B: The uppermost part of Osawa viewed from the left bank (August 2004).
C: Kengamine and Arinotowatari viewed from the right bank (August 2005).
D: Enlarged view of central part of C. Two unconformities exist as shown at E. Researchers and supporting climbers are in the circles (August 2004).
E: A sketch of picture E showing flow directions and unconformities.

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