Wiktionary
n. (context geology English) An upwelling of crystalline rock salt and its aureole of deformed sediments.
Wikipedia
A salt dome is a type of structural dome formed when a thick bed of evaporite minerals (mainly salt, or halite) found at depth intrudes vertically into surrounding rock strata, forming a diapir. It is important in petroleum geology because salt structures are impermeable and can lead to the formation of a stratigraphic trap.
Usage examples of "salt dome".
From there, the cliff rose above the low buildings at the outskirts of the city, loose rubble from the salt dome lying in plain sight, some sections a dozen yards thick, others only broken into a million small crystals the size of a fist.
There are 1,000 acres of producing field, and they lie atop a salt dome (see below).
The salt dome's air circulation system would diffuse the gas through the man-made cave within two minutes, and within three not a soul would be still alive.
Gwillam Forte's press representative explained it away by saying that it came from a tunnel to a nearby salt dome, where SD-2 would soon be built.
Sinking a shaft to the salt dome they had located, three thousand meters down, would cost in the millions&mdash.
The salt dome was definite, the drilling sites were chosen, the main work of the expedition was done.