The bed of the river near the falls is a basalt flow lying over an Amygdaloid flow.

Paulingite is usually found in vesicles of basalt flows.

However, the Pueblo Mountains also have much older metamorphic rock underlying the more recent basalt flows.

Also, a basalt flow intrudes through the Gettysburg Formation near the town.

For instance, a series of basalt flows are assumed to be related to one another.

During the Eocene Period, a large basalt flow covered most of the nearby plateau.

The lower ridges on the eastern front also contain Jurassic basalt flows.

There are a great many other possible variables within a single basalt flow, apart from the vesicle distribution.

When a basalt flow has cooled sufficiently for some sort of crust to form, one of two possible things can happen.

A basalt flow can advance over a kilometre of flat ground in a matter of hours; an andesite may take months.