THE YIELDING OF THE EARTH'S CRUST.

Washington, D.C.: GPO Magazine. Very Good. Soft cover. pp235-247, drawings. Removed from ANNUAL REPORT OF THE BOARD OF REGENTS OF THE SMITHSONIAN INSTITUTION FOR THE YEAR ENDING JUNE 30, 1921. VG. In plastic report covers. "The geological evidence is such as to justify anyone in concluding that the material of at least the outer portion of the earth has moved from place to place during past geological periods. Material that must have been laid down in the form of sediments in shallow oceanic waters, as is evidenced by the presence of sea-shell fossils, is now above sea level, in some cases to the extent of many thousands of feet. Sedimentary rocks, which must have been laid down in horizontal or nearly horizontal strata, are now much curved and distorted. There could be cited many cases to show that strata have not only moved in elevation but also horizontally. What has caused these movements is one of the outstanding problems in geophysics and geology." .