. Annual report for the year ended June 30 .... United States National Museum. Reconstruction of Cambrian black-mud sea bottom of 500 million years ago. Plants and animals of this period were first recognized and described by Charles D, Walcott, fourth Secretary of Smithsonian Institution. Below: Eurypterid, or sea scorpion, about 3 feet long, from the brackish Silurian sea that covered the Buffalo, , area about 320 million years Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of th
. Annual report for the year ended June 30 .... United States National Museum. Reconstruction of Cambrian black-mud sea bottom of 500 million years ago. Plants and animals of this period were first recognized and described by Charles D, Walcott, fourth Secretary of Smithsonian Institution. Below: Eurypterid, or sea scorpion, about 3 feet long, from the brackish Silurian sea that covered the Buffalo, , area about 320 million years 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 United States National Museum. [Washington] : Smithsonian Institution
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