Here's why:

* Discordant: This means the rock body cuts across existing rock layers, rather than being parallel to them.

* Intrusive Igneous Rock: This means the rock formed from magma that cooled and solidified underground.

* Batholith: These are the largest intrusive bodies, often covering hundreds or even thousands of square kilometers. They are typically formed from the slow cooling and crystallization of massive amounts of magma deep within the Earth's crust.

Some famous examples of batholiths include:

* Sierra Nevada Batholith: Located in California, USA, it is over 400 km long and contains some of the tallest peaks in the Sierra Nevada mountain range.

* Idaho Batholith: Located in Idaho, USA, it is over 250 km long and played a major role in shaping the Rocky Mountains.

Let me know if you have any other questions!