| Ryolite is the hard rock, which can be seen in the large volcanic neck that juts up along the river and is the bulk of the rock in the park. |
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| Devils Tower, Wyoming, is probably a volcanic neck but might also be a laccolith. |
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| The ore body is brecciated and may represent the filling of a volcanic neck or pipe. |
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| This volcanic neck is located a few miles south of Tuff Canyon on the west side of the road. |
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| Over here is Belougery Spire, OK, and that's an old volcanic neck. |
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| A zone of sterilized rock around the volcanic neck will be sampled at a depth of several hundred meters to determine if microorganisms are present. |
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| Sugarloaf Mountain near Campbellton represents a Devonian volcanic neck that became plugged with felsic lava during the final stages of volcanism. |
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