Word: laccolith
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Source of Wonder. As the ground rose, a railroad track had to be moved and the bed of a nearby stream had to be deepened. The postmaster kept copious records of every move the mountain made. Geologists decided that it was caused by a "laccolith," a mass of molten material that had forced its way toward the surface, raising local rock strata instead of breaking through them...
...There may be also a laccolith: a formation where lava once pooled into a cone. The top crust cooled but the hot material beneath found egress, leaving a bubble formation with the top separated from the bottom by perhaps 1,500 ft. In this case sinking would continue until a box canyon was formed...
...GEOLOGICAL CONFERENCE. Papers: "Photomicrographs of Iron and Steel" (illustrated; 30 minutes), Dr. H. C. Boynton; "Model of a Laccolith in the Black Hills (30 minutes), Mr. H. E. Simpson. Geological Lecture Room...
...GEOLOGICAL CONFERENCE. Papers: "A Laccolith in the Black Hills," Mr. H. G. Ferguson (20 minutes). "Glacial Cirques in the Montana Rockies," Mr. F. E. Matthes (30 minutes), (illustrated), Geological Lecture Room...
...GEOLOGICAL CONFERENCE. Papers: "A Laccolith in the Black Hills," Mr. H. G. Ferguson (20 minutes). "Glacial Cirques in the Montana Rockies," Mr. F. E. Matthes (30 minutes), (illustrated), Geological Lecture Room...