- A natural bridge or arch in limestone .
A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. Courtesy of the author & The Karst Waters Institute. 2002.
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karst window — 1. Depression revealing a part of a subterranean river flowing across its floor, or an unroofed part of a cave. 2. A small natural bridge or arch which can be seen through . 3. A through opening in natural limestone walls, formed by… … Lexicon of Cave and Karst Terminology
bridge — 1. May be a natural bridge of bedrock normally formed outside a cave entrance by partial collapse leaving an isolated roof segment, as in the famous examples of Rakov Škocjan, Slovenia. Rock bridges may also occur inside caves due either… … Lexicon of Cave and Karst Terminology
natural bridge — 1. A residual portion of the roof of a subterranean stream which has not collapsed and is found bridging a valley. Normally a surface feature, but may be used to describe a similar occurrence in a cave system . 2. A rock bridge spanning … Lexicon of Cave and Karst Terminology
London Bridge (disambiguation) — London Bridge is a bridge over the River Thames in central London, England.London Bridge may also refer to:* London Bridge (karst), a limestone karst near Canberra, Australia * London Bridge (Lake Havasu City), a bridge in Lave Havasu City,… … Wikipedia
London Bridge (karst) — London Bridge is a limestone karst near Canberra, Australia that consists of a limestone arch hollowed out by the Molonglo River.It was first discovered by the European explorers Captain Mark Currie, Brigadier Major John Ovens, Joseph Wild and… … Wikipedia
Crossing the bridge noodles — Simplified Chinese 过桥米线 Literal meaning Cross bridge rice noodles … Wikipedia
natural arch — 1. A residual portion of the roof of a subsurface karst cavity which has not collapsed. Such a natural arch may occur as a surface topographic feature, or as a part of a cave system . 2. A rock arch or very short natural tunnel;… … Lexicon of Cave and Karst Terminology
window — 1. In speleology, a natural opening above the floor of a passage or a room, giving access to an adjoining cavity or to the surface; larger and less symmetrical than a porthole. 2. The opening under the arch of a small natural bridge .… … Lexicon of Cave and Karst Terminology
blade — In a cave, a thin sharp projection jutting out from roof, wall, or floor, of which it is an integral part; generally the remains of a partition or bridge  … Lexicon of Cave and Karst Terminology
false floor — A remnant of a sheet of flowstone, originally deposited on clastic sediments that were subsequently washed out from beneath. False floors may survive as a complete bridge between passage walls or just as projecting ledges. They may be thin and … Lexicon of Cave and Karst Terminology