Relative age means age in comparison with other rocks, either younger or older. New rock layers are always deposited on top of existing rock layers. Therefore, deeper layers must be older than layers closer to the surface. This is the law of superposition.

What is relative dating inclusion law?

The law of included fragments is a method of relative dating in geology. Essentially, this law states that clasts in a rock are older than the rock itself. For example, in sedimentary rocks, it is common for gravel from an older formation to be ripped up and included in a newer layer.

Are these inclusions older or younger than the rock they are in?

Inclusions are always older than the rock they are found in. Even if we did not see the igneous and metamorphic rocks in surface exposures, the fact that they occur in the (brownish) sediment unit indicates the presence of older ingneous and metamoprhic rocks that supply material to that unit.