| 21. | The Thumb consists of alkali olivine basalt along with other Quaternary volcanic plugs in the Omineca Mountains.
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| 22. | This group of small volcanoes on the upper Bridge River includes stratovolcanoes, volcanic plugs and lava flows.
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| 23. | The Waitakere Ranges also contain many dikes, volcanic plugs, etc ., that formed part of this volcano.
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| 24. | "' Cabezon Peak "'is a large volcanic plug that is a prominent feature in northwestern New Mexico.
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| 25. | The hill is the second to last in a series of volcanic plugs called the Nine Sisters.
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| 26. | The park takes its name from "'Beacon Rock "', an basalt volcanic plug next to the Columbia River.
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| 27. | Two mineralized zones, termed the Fire Tower Zone and the North Zone, occur within volcanic plugs about apart.
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| 28. | Geologists have determined that the Blue Mountains Basalts are derived from a lava flow, not a volcanic plug.
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| 29. | A cluster of 14 volcanic plugs are exposed that were originally under the central part of Maitland Volcano.
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| 30. | Geologically, the law is a volcanic plug of hard phonolitic trachyte rock of Carboniferous ( Dinantian ) age.
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