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Encyclopedia Britannica - Main :: INV-JED |
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JACOBS CAVERN , a cavern in latitude
Academy
Jacobs Cavern is one of the smaller caves, hardly more than a rock-shelter, and is entirely in the " St Joe Limestone " of the sub-carboniferous age. Its roof is a single flat stratum of lime-stone; its walls are well marked by lines of stratification; drip-stone also partly covers the walls, fills a deep fissure at the end of the cave, and spreads over the floor, where it mingles with an ancient bed of ashes, forming an ash-breccia (mostly firm and solid) that encloses fragments of sandstone, flint spalls, flint implements, charcoal and bones. Underneath is the true floor of the cave, a mass of homogeneous yellow clay, one metre in thickness. It holds scattered fragments of limestone, and is itself the result of limestone degeneration. The length of the opening is over 21 metres; its depth 14 metres, and the height of roof above the undisturbed ash deposit varied from r m. 20 cm. to 2 M. 6o cm. The bone recess at the end was from 50 cm. to 8o cm. in height. The stratum of ashes was from 50 cm. to I M. 50 cm. thick. The ash surface was staked off into square metres, and the substance carefully removed in order. Each stalactite, stalagmite and pilaster was measured, numbered, and removed in sections. Six human skeletons were found buried in the ashes. Seven-tenths of a cubic metre of animal bones were found: deer, bear , wolf, raccoon, opossum, beaver, buffalo
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The rude type of the implements, the absence of fine pottery, and the peculiarities of the human remains, indicate a race of occupants more ancient than the " mound-builders." The deepest implement observed was buried 50 cm. under the stalagmitic surface. Dr. Hovey has proved that the rate of stalagmitic growth in Wyandotte Cave, Indiana, is .0254 cm. annually; and if that was the rate in Jacobs Cavern, 1968 years would have been needed for the embedding of that implement. Polished rocks outside the cavern and pictographs in the vicinity indicate the work
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