Volcanic plug in the context of "Crag and tail"

La Gomera (Spanish: [la ɣoˈmeɾa] ) is one of Spain's Canary Islands, in the Atlantic Ocean off the coast of Africa. With an area of 370.03 km (142.87 sq mi), it is the third-smallest of the archipelago's eight main islands. It belongs to the province of Santa Cruz de Tenerife. La Gomera is the third least populous of the eight main Canary Islands, with 22,361 inhabitants at the start of 2023. Its capital is San Sebastián de La Gomera, where the cabildo insular (island council) is located.

A monolith is a geological feature consisting of a single massive stone or rock, such as some mountains. Erosion usually exposes the geological formations, which are often made of very hard and solid igneous or metamorphic rock. Some monoliths are volcanic plugs, solidified lava filling the vent of an extinct volcano.

In architecture, the term has considerable overlap with megalith, which is normally used for prehistory, and may be used in the contexts of rock-cut architecture that remains attached to solid rock, as in monolithic church, or for exceptionally large stones such as obelisks, statues, monolithic columns or large architraves, that may have been moved a considerable distance after quarrying. It may also be used of large glacial erratics moved by natural forces.

A batholith (from Ancient Greek βαθύς (bathús), meaning "deep", and λίθος (líthos), meaning "stone") is a large mass of intrusive igneous rock (also called plutonic rock), larger than 100 km (40 sq mi) in area, that forms from cooled magma deep in the Earth's crust. Batholiths are almost always made mostly of felsic or intermediate rock types, such as granite, quartz monzonite, or diorite (see also granite dome).

The Bass Rock, or simply the Bass ( /bæs/), is an island in the outer part of the Firth of Forth in the east of Scotland. Approximately 2 km (1 mi) offshore, and 5 km (3 mi) north-east of North Berwick, it is a steep-sided volcanic plug, 107 m (351 ft) at its highest point, and is home to a large colony of gannets. The rock is uninhabited, but historically has been settled by an 8th-century Christian hermit, and later was the site of an important castle, which after the Commonwealth period was used as a prison. The island belongs to Hew Hamilton-Dalrymple, whose family acquired it in 1706, and previously to the Lauder family for almost six centuries. The Bass Rock Lighthouse was constructed on the rock in 1902, and the remains of a chapel survive.

The Bass Rock features in many works of fiction, including Lion Let Loose by Nigel Tranter, Catriona by Robert Louis Stevenson, The Lion Is Rampant by the Scottish novelist Ross Laidlaw and The New Confessions by William Boyd. Most recently it features prominently in The Bass Rock by Evie Wyld, which won the 2021 Stella Prize.

Carbonatite (/kɑːrˈbɒnəˌtaɪt/) is a type of intrusive or extrusive igneous rock defined by mineralogic composition consisting of greater than 50% carbonate minerals. Carbonatites may be confused with marble and may require geochemical verification.

Carbonatites usually occur as small plugs within zoned alkalic intrusive complexes, or as dikes, sills, breccias, and veins. They are almost exclusively associated with continental rift-related tectonic settings. It seems that there has been a steady increase in the carbonatitic igneous activity through the Earth's history, from the Archean eon to the present.

Dumbarton Castle (Scottish Gaelic: Dùn Breatainn, pronounced [t̪unˈpɾʲɛʰt̪ɪɲ]; Welsh: Alt Clut) has the longest recorded history of any stronghold in Scotland. It sits on a volcanic plug of basalt known as Dumbarton Rock which is 240 feet (73 m) high and overlooks the Scottish town of Dumbarton.

Ball's Pyramid is an uninhabited islet in the Pacific Ocean located 20 kilometres (12 mi; 11 nmi) southeast of Lord Howe Island, between Australia and New Zealand. The steep rocky basalt outcrop is the eroded plug of a shield volcano and caldera that formed 6.4 million years ago. It is 572 metres (1,877 ft) high, 1,100 metres (3,609 ft) long and only 300 metres (984 ft) across, making it the tallest volcanic stack in the world.

Ball's Pyramid, which is part of Australia's Lord Howe Island Marine Park, is positioned in the centre of a submarine shelf surrounded by rough seas, which makes any approach difficult. The pyramid is home to the only remaining wild population of the giant Lord Howe Island stick insect, thought to be extinct since 1920 until their discovery in 2001.

The Pitons are two mountainous volcanic plugs, volcanic spires, located in Saint Lucia. Petit Piton is 743 m (2,438 ft) high and Gros Piton is 798.25 m (2,618.9 ft) high; they are linked by the Piton Mitan ridge. Piton means mountain peak in French, so Petit and Gros Piton respectively refer to the smaller and larger peak. The Pitons are a World Heritage Site, 2,909 ha (7,190 acres) in size, and located near the town of Soufrière.