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Novaculite, also called Arkansas Stone, is a microcrystalline to cryptocrystalline rock type that consists of silica in the form of chert or flint. It is commonly white to grey or black in color, with a specific gravity that ranges from 2.2 to 2.5.
The main structure is a braced metal-frame fire tower, alongside which stand a residence, privy, and vaulted stone storage cellar. These structures were all built in 1937 by a crew of the Civilian Conservation Corps , and is particularly unusual because the fire watch facility included a residence.
[14] [16] In 1996, Fasold co-wrote a paper with geologist Lorence Collins titled "Bogus 'Noah's Ark' from Turkey Exposed as a Common Geologic Structure", which concluded that the boat-shaped formation was a natural stone formation that merely resembled a boat. The same paper pointed out that the "anchors" were local volcanic stone. [16]
Gothic rib vault ceiling of the Saint-Séverin church in Paris Interior elevation view of a Gothic cathedral, with rib-vaulted roof highlighted. In architecture, a vault (French voûte, from Italian volta) is a self-supporting arched form, usually of stone or brick, serving to cover a space with a ceiling or roof.
The ceiling is completely flat, including the dome on the left Annular vault – A Barrel vault springing from two concentric walls. Barrel vault – An architecture tunnel vault or barrel vault is a semicircular arch extended in depth: a continuous series of arches, one behind the other.
There are also the usual dangers associated with caverns: claustrophobia, poor air circulation, floor/ceiling collapses and getting lost. There is no light except for occasional patches of phosphorescent fungus ; most Underdark inhabitants either have highly developed senses other than sight or have developed darkvision .
In architecture, a boss is a decorative knob on a ceiling, wall or sculpture. Bosses can often be found in the ceilings of buildings, particularly at the keystones at the intersections of a rib vault. [1] In Gothic architecture, such roof bosses (or ceiling bosses) are often intricately carved with foliage, heraldic devices or other
A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to bear weight.