. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. AMERICAN GEOLOGY EATONIAN ERA. 1820-1829. 275 He remarked on the disappearance of the primitive rocks soon after leaving1 Philadelphia and the appearance of the transition limestone, ~^J-. with occasional protrnsions through this limestone of amphibolite. He also made reference to the red sandstone of Pennsylvania, New Jersey, and Maryland and the calcareous breccia found on the Potomac. Please note that these images are extracted from scan
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. AMERICAN GEOLOGY EATONIAN ERA. 1820-1829. 275 He remarked on the disappearance of the primitive rocks soon after leaving1 Philadelphia and the appearance of the transition limestone, ~^J-. with occasional protrnsions through this limestone of amphibolite. He also made reference to the red sandstone of Pennsylvania, New Jersey, and Maryland and the calcareous breccia found on the Potomac. 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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