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A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile -charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption.
Agathla Peak is an eroded volcanic plug consisting of volcanic breccia cut by dikes of an unusual igneous rock called minette. It is one of many such volcanic diatremes that are found in Navajo country of northeast Arizona and northwest New Mexico.
Huerfano Butte (/ ˈ w ɛər f ə n oʊ /; Spanish pronunciation:) is a volcanic plug [5] or hypabyssal plug [6] located 8.8 miles (14.1 km) north of Walsenburg in Huerfano County, Colorado, United States.
Cabezon Peak is a large volcanic plug that is a prominent feature in northwestern New Mexico.It rises to 7,785 feet (2,373 meters) in elevation, and nearly 2,000 feet above the floor of the Rio Puerco Valley. [4]
The island is a volcanic plug of the Miocene era Waitākere Volcano, composed of stratified rudite and intrusive andesite. [1] The rock is what remains of one of the volcano's funnel-shaped vents on the eastern side of the mountain, which was uplifted from the sea between 3 and 5 million years ago. [2]
The Taung Kalat pedestal hill is sometimes itself called Mount Popa and given that Mount Popa is the name of the actual volcano that caused the creation of the volcanic plug, to avoid confusion, the volcano (with its crater blown open on one side) is generally called Taung Ma-gyi (mother hill). The volcanic crater itself is a mile in diameter. [14]
This volcanic plug, roughly 300 metres (980 feet) in diameter, has a potassium–argon date of 1.6 ± 0.2 million years which may be due to excess argon. [ 103 ] [ 107 ] The eruptions during Ice Peak time deposited 76.7 cubic kilometres (18.4 cubic miles) of volcanic material, making the Ice Peak Formation the most voluminous geological ...
Morro Rock (Salinan: Le'samo; Chumash: Lisamu'; Spanish: El Morro) [4] [5] [6] is a volcanic plug in Morro Bay, California, on the Pacific Coast at the entrance to Morro Bay harbor. A causeway connects it with the shore, making it a tied island. The rock is protected as the Morro Rock State Preserve. [7]