* Intrusive Igneous Rock (like granite) - This is the rock that would be exposed first as erosion wears away overlying layers.
* Metamorphic Rock (like gneiss or schist) - This rock type is formed when pre-existing rocks (like the intrusive igneous rock) are subjected to heat and pressure deep underground. As the overlying layers are eroded, the metamorphic rock would be exposed.
Why these two?
* Uplift: Uplift brings deep underground rocks closer to the surface.
* Erosion: Erosion wears away overlying layers, revealing rocks that were once buried.
* Igneous and metamorphic rocks: These rock types are formed in the Earth's crust and mantle, and are typically found at depths where they are exposed by uplift and erosion.
Additional Considerations:
* The specific types of igneous and metamorphic rocks would depend on the specific geological conditions and composition of the original rock.
* The presence of sedimentary rocks is also possible, depending on the depositional history of the area. However, since the question emphasizes a long period of uplift and erosion, these sedimentary layers would likely have been eroded away.
