The Wyoming batholith is a granite batholith of Neoarchean origin 2,800 to 2,500 million years ago—which forms the eroded core of the Granite and Laramie Mountains in central Wyoming.
[1] The Wyoming batholith lies within the Wyoming Craton.
The batholith, in its time, was a magma chamber.
Contemporary magma chambers are filled with lava and buried deeply and are inaccessible.
The Wyoming batholith is accessible for study, its overburden having eroded away.