Level 1 · Superposition
An undisturbed sequence of four sedimentary rocks
Geological evidenceStudy the finished rock record before making your sequence.
The sedimentary rocks form a sequence that can be read from bottom to top.
The investigation
Look for clues
Use the geology, not the position of the cards.
Oldest to youngest
Arrange the events
Tap a card to place it, or drag it into a numbered position. Tap a placed event to remove it.
Your geological timeline
Choose the events in the correct order.