igneous rock

Rocks formed by the cooling and solidifying of molten materials. Igneous rocks can form beneath the Earth 's surface, or at its surface, as lava .

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Notes

Granite, solid volcanic lava, and basalt are examples of igneous rock.

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The beacons were found to be part of a horizontal, stratified series of sandstones underlying the igneous rock.

The strata are bent down towards the central plug of igneous rock, and are generally more or less altered at the line of junction.

How does a contemporaneous igneous rock affect the beds upon which it rests?

What is a neck of intrusive igneous rock, and how have the strata surrounding it been affected?

That is, a dike is a more or less vertical sheet of igneous rock which has cooled and crystallized in a fissure.

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