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The Park lies on a limestone bedrock with was formed by the tropical sea 340 millions year ago.

Limestone is a type of rock formed by fossils and sediments of fish and shells.

Over time, these sediments built up and were pressed together by the weight of the water to form limestone.

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Sandstone boulders were deposited during the last Ice Age and are known as 'glacial erratics'.

Sandstone is a type of rock formed by sediments of sand pressed together.

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In these pictures, you can see the sandstone sits on a 'pedestal' of limestone. This is because the other limestone has been dissolved by the weather over time. Sandstone is a stronger rock and has protected the limestone underneath.

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You may see features like this sinkhole around the Burren.

The limestone was dissolved by the weather and caused the top layer to collapse forming this hole