. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 136 GEOLOGICAL HISTORY OF THE YELLOWSTONE PARK. close of the Cretaceous, altliougli there is good reason to believe that in this region profound fanlting and displacement continued the work of mountain building well into the Middle Tertiary period. Throughout Tertiary time in the Park area, geological history was char-. :iiueh=vju,ncs. YELLOWSTO>'E JiATIONAL PARK acterized by great volcanic activity, enormons volumes of erupted mat
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 136 GEOLOGICAL HISTORY OF THE YELLOWSTONE PARK. close of the Cretaceous, altliougli there is good reason to believe that in this region profound fanlting and displacement continued the work of mountain building well into the Middle Tertiary period. Throughout Tertiary time in the Park area, geological history was char-. :iiueh=vju,ncs. YELLOWSTO>'E JiATIONAL PARK acterized by great volcanic activity, enormons volumes of erupted mate- rial being jwured out in theEocene and Middle Tertiary, continuing with less force through the Pliocene, and extending into Quaternary time. Within very recent times there is no evidence of any considerable out-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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