Sedimentary Rocks in Ireland

Formed from remains of animals and plant life.
Most common rock type in Ireland.
Example: The Burren in County Clare.
Made from cemented and compressed remains of sea creatures.
Contains calcium carbonate from bones.
Color varies from grey to white to black.
Formed approximately 350 million years ago during the Carboniferous period (Carboniferous limestone).

Formed from broken-down remains of pre-existing rock.
Examples in Ireland: Comeragh Mountains (County Waterford) and Macgillycuddy Reeks (County Kerry).
Coarse-grained, usually brown or red.
Most common type: old red sandstone (red color due to iron oxide).
Formed approximately 400 million years ago when Ireland had a desert-like climate.
Sediments from weathered Caledonian fold mountains were carried by rivers and deposited in shallow seas and lakes.
Laid down in layers (strata), compressed and cemented over time.
Also formed in river channels, deltas, and floodplains.

Formed over millions of years on land, lake beds, or beneath the sea.
Two main types: organic and inorganic.
- Organic: Formed from the remains of plants and animals.
- Inorganic: Formed from broken-down pre-existing rocks.

Formed from remains of animals and plant life.
Most common rock type in Ireland.
Example: The Burren in County Clare.
- The Burren is a karst landscape, known for its unique flora and geological formations.
Made from cemented and compressed remains of sea creatures.
- These creatures include shellfish, coral, and algae.
Contains calcium carbonate from bones.
- $CaCO_3$ is the chemical formula for calcium carbonate.
Color varies from grey to white to black.
- Color depends on the impurities present during formation.
Formed approximately 350 million years ago during the Carboniferous period (Carboniferous limestone).
- The Carboniferous period was characterized by warm, shallow seas that supported abundant marine life.

Formed from broken-down remains of pre-existing rock.
Examples in Ireland: Comeragh Mountains (County Waterford) and Macgillycuddy Reeks (County Kerry).
Coarse-grained, usually brown or red.
- Grain size can vary, affecting the texture of the rock.
Most common type: old red sandstone (red color due to iron oxide).
- Iron oxide (\textFe2O3) gives the rock its reddish hue.
Formed approximately 400 million years ago when Ireland had a desert-like climate.
- This was during the Devonian period.
Sediments from weathered Caledonian fold mountains were carried by rivers and deposited in shallow seas and lakes.
- The Caledonian mountains were formed by the collision of tectonic plates.
Laid down in layers (strata), compressed and cemented over time.
- Strata can reveal the geological history of an area.
Also formed in river channels, deltas, and floodplains.