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    Answer 3 out of 4 questions correctly.

The following diagram shows an example of a rock sequence. Use the rock sequence to answer the question below.
A diagram with two layers of rock. A layer of sandstone with footprints is below a layer of limestone. A vertical, double-headed arrow shows the age of the rock layers. The oldest rock layer is at the bottom of the diagram. The youngest rock layer is at the top of the diagram.
The sandstone layer was formed from sediment deposited on a beach. This layer contains fossils of dinosaur footprints. 
The limestone layer was formed from sediment deposited on the ocean floor. No dinosaur footprint fossils were found in this layer. 
Which rock layer is older?
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