. The Canadian record of science. Natural history. 98 Canadian Record of Science. to have been found embedded in clay in the region between Irvine and the Cypress Hills in the Xorth-West. They consist of a greyish-white, opalescent chalcedony with hard- ness of 7 and specific gravity 2"592. The person wbo found them supposed they were fossils, and some of them certainly remind one of nummulites. In some cases they are flat on both sides, in others flat on one side and convex on the other. The convex sides are mostly smooth, and in some cases exhibit slight radial depressions or furrows. T
. The Canadian record of science. Natural history. 98 Canadian Record of Science. to have been found embedded in clay in the region between Irvine and the Cypress Hills in the Xorth-West. They consist of a greyish-white, opalescent chalcedony with hard- ness of 7 and specific gravity 2"592. The person wbo found them supposed they were fossils, and some of them certainly remind one of nummulites. In some cases they are flat on both sides, in others flat on one side and convex on the other. The convex sides are mostly smooth, and in some cases exhibit slight radial depressions or furrows. The flat sides, however, show marked concentric furrows. When viewed by transmitted light, the concretions are seen to have a radiated as well as a concentric structure, and the radiated structure is made much more apparent by grinding down. until the concretion has become transparent. This is especially true if the section be examined in polarised light when it is also seen to be doubly refracting. The concretions are from a-quarter of an inch or less in diameter up to. 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 Natural History Society of Montreal. Montreal, Natural History Society
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Keywords: ., bookcentury1800, bookdec, booksubjectnaturalhistory, bookyear1884
