The type of unconformity that separates older metamorphic rocks from younger sedimentary rocks immediately above them is called an angular unconformity.

Here's why:

* Angular Unconformity: This type of unconformity occurs when tilted or folded sedimentary rocks are eroded, and then new sedimentary layers are deposited on top of them. The older, tilted rocks have a different angle than the younger, horizontal layers, creating an "angle" at the unconformity.

Let me know if you'd like to learn more about different types of unconformities!