Volcanic plugs are believed to overlie a body of magma which could be either still largely liquid or completely solid depending on the state of activity of the volcano. Plugs are known, or postulated, to be commonly funnel shaped and to taper downward into bodies increasingly elliptical in plan or elongated to dike-like forms. Typically, volcanic plugs and necks tend to be more resistant to erosion than their enclosing rock formations. Thus, after the volcano becomes inactive and deeply eroded, the exhumed plug may stand up in bold relief as an irregular, columnar structure. - USGS
| Place | Type | AsNotedIn | Locale | |
|---|---|---|---|---|
| Place | Type | AsNotedIn | Locale | |
| Petit Piton |
|
Pitons Management Area | ||
| Gros Piton |
|
Pitons Management Area | ||
| Shiprock | New Mexico |
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