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Below is a list of some other places where you can see outcroppings of Madison Limestone. It can be found near the surface in the sky-blue areas (labelled uPZ in some places) on this Geologic Map of Montana (click on the map to enlarge it when the page opens up).
Dacite usually forms as an intrusive rock such as a dike or sill. Examples of this type of dacite outcrop are found in northwestern Montana and northeastern Bulgaria. Nevertheless, because of the moderate silica content, dacitic magma is quite viscous and therefore prone to explosive eruption.