One of the mysteries of the English language finally explained.
A mass of igneous rock, typically lens-shaped, that has been intruded between rock strata causing uplift in the shape of a dome.
- ‘This age is essentially identical with the rhyodacite laccoliths in the Grosvenor Hills intrusion which are also reversely polarized.’
- ‘The three laccoliths in this famous group were not all created at the same time.’
- ‘The larger area below the laccolith could cover an area as large as several states.’
- ‘Nearby Lime Butte, Gypsum Butte, and Green Mountain are all laccoliths with varying degrees of exposure.’
- ‘Based on the position of the dikes, where was the source of the magma for the laccoliths located?’
Late 19th century: from Greek lakkos ‘reservoir’ + -lith.
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