1. n. [Geology] The approximate age determination of rocks, fossils or minerals made by comparing whether the material is younger or older than other surrounding material.

What is the best definition of relative age?

The geologic age of a fossil organism, rock, geologic feature, or event, defined relative to other organisms, rocks, features, or events rather than in terms of years.

Is the extrusion older or younger?

Rock layers below an extrusion are always older than the extrusion. Now the extrusion is the youngest layer. An intrusion is always younger than the rock layers around and beneath it.

Does relative age mean?

Relative age is the age of a rock layer (or the fossils it contains) compared to other layers. It can be determined by looking at the position of rock layers. Absolute age is the numeric age of a layer of rocks or fossils. Absolute age can be determined by using radiometric dating.