The extrusion is younger because extrusions are always younger than the rock layers below them.
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Most absolute age of fossils.
When you finish, you should have a vertical stack of cards with the top card representing the youngest fossils of this rock sequence and the "TC" card at the bottom of the stack representing the oldest fossils.
They can be used to determine the relative age of rocks.
2 How do you know that "X" is older than "M"? Find the training resources you need for all your activities.