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Fingal's Cave

Sea cave in Scotland

  • 4 min read
  • 5 chapters
Fingal's Cave , Island of Staffa , Scotland
Unknown author Unknown author · Public domain

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Through Hexagon and Echo

Formation

Fingal's Cave is formed entirely from hexagonally jointed columnar basalt within a Paleocene lava flow and is similar in structure to both the Giant's Causeway in Northern Ireland and Ulva.

In these locations, cooling on the upper and lower surfaces of the solidified lava resulted in contraction and fracturing, starting in a blocky tetragonal pattern and transitioning to a regular hexagonal fracture pattern with fractures perpendicular to the cooling surfaces. As cooling continued these cracks gradually extended toward the centre of the flow, forming the long hexagonal columns we see in the wave-eroded cross-section today. Similar hexagonal fracture patterns are found in desiccation cracks in mud where contraction is due to loss of water instead of cooling.

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