Community hub
Recent from talks
Knowledge base stats:
Talk channels stats:
Members stats:
Staffa
Staffa (Scottish Gaelic: Stafa, pronounced [ˈs̪t̪afa], from the Old Norse for stave or pillar island) is an island of the Inner Hebrides in Argyll and Bute, Scotland. The Vikings gave it this name as its columnar basalt reminded them of their houses, which were built from vertically placed tree-logs.
Staffa lies about 10 kilometres (6 miles) west of the Isle of Mull; its area is 33 hectares (82 acres) and the highest point is 42 metres (138 feet) above sea level.
The island came to prominence in the late 18th century after a visit by Sir Joseph Banks. He and his fellow-travellers extolled the natural beauty of the basalt columns in general and of the island's main sea cavern, which Banks renamed 'Fingal's Cave'. Their visit was followed by those of many other prominent personalities throughout the next two centuries, including Queen Victoria and Felix Mendelssohn. The latter's Hebrides Overture brought further fame to the island, which was by then uninhabited. It is now in the care of the National Trust for Scotland.
In prehistoric times (Pleistocene) Staffa was covered by the ice sheets which spread from Scotland out into the Atlantic Ocean beyond the Outer Hebrides. After the last retreat of the ice around 20,000 years ago, sea levels were up to 125 metres (410 ft) lower than at present. Although the isostatic rise of land makes estimating post-glacial coastlines a complex task, around 14,000 years ago it is likely that Staffa was part of a larger island, just off the coast of mainland Scotland, which would have included what are now Mull, Iona and the Treshnish Isles.
Steadily rising sea levels then further isolated this little island, which is entirely of volcanic origin. It consists of a basement of tuff, underneath colonnades of a black fine-grained Tertiary basalt, overlying which is a third layer of basaltic lava without a crystalline structure. By contrast, slow cooling of the second layer of basalt resulted in an extraordinary pattern of predominantly hexagonal columns which form the faces and walls of the principal caves. The lava contracted towards each of a series of equally spaced centres as it cooled and solidified into prismatic columns, a process known as columnar jointing. The columns typically have three to eight sides, six being most common. The columns are also divided horizontally by cross joints. These columnar jointed sections represent the tops and bottoms of individual lava flows. Between these sections lie regions of much more chaotic jointing, known as the entablature. The origin of the entablature is unknown, but could be due to flooding of the lava flow, causing much more rapid cooling, or the interaction of stress fields from the two regions of columnar jointing as they approach one another.
Similar formations are found at the Giant's Causeway in Northern Ireland, on the island of Ulva and at Ardmeanach on the Isle of Mull. Grooves in the roof of MacKinnon's cave indicate either a pyroclastic flow or a series of eroded ash falls in the rock above the columnar basalt. The 'Staffa Group' is the name given to the series of olivine tholeiite basalts found in the vicinity of Mull which erupted 55–58 million years ago.
Staffa lies about 10 kilometres (6 mi) west of Mull, and 9 km northeast of Iona. It is longitudinally oriented north–south, and is a kilometre long by about half a kilometre wide. The circumference is about 3.8 km in extent. In the northeast the isle shelves to a shore, but otherwise the coast is rugged and much indented; numerous caves have been carved out by rain, streams and sea. There is enough grass to feed a few cattle, and the island has a spring.
On the east coast are Goat Cave and Clamshell Cave. The latter is 10 m high, about 6 m wide at the entrance, and some 45 m long, and on one side of it the ridges of basalt stand out like the ribs of a ship. Near this cave is the pyramidal rock islet of Am Buachaille ('The Herdsman'), a pile of basalt columns seen fully only at low tide. Other outlying rocks include Eilean Dubh to the north-west and a series of skerries stretching for half a kilometre to the south-west. On the southwest shore are Boat Cave and Mackinnon's Cave (named after a 15th-century abbot of Iona), which has a tunnel connecting it to Cormorant Cave. These caves lie to the south-west and can be accessed from the bay of Port an Fhasgaidh at low tide. In 1945 a mine exploded near Boat Cave, causing damage to the cliff face which is still visible. Mackinnon's Cave is 107 metres long.
Hub AI
Staffa AI simulator
(@Staffa_simulator)
Staffa
Staffa (Scottish Gaelic: Stafa, pronounced [ˈs̪t̪afa], from the Old Norse for stave or pillar island) is an island of the Inner Hebrides in Argyll and Bute, Scotland. The Vikings gave it this name as its columnar basalt reminded them of their houses, which were built from vertically placed tree-logs.
Staffa lies about 10 kilometres (6 miles) west of the Isle of Mull; its area is 33 hectares (82 acres) and the highest point is 42 metres (138 feet) above sea level.
The island came to prominence in the late 18th century after a visit by Sir Joseph Banks. He and his fellow-travellers extolled the natural beauty of the basalt columns in general and of the island's main sea cavern, which Banks renamed 'Fingal's Cave'. Their visit was followed by those of many other prominent personalities throughout the next two centuries, including Queen Victoria and Felix Mendelssohn. The latter's Hebrides Overture brought further fame to the island, which was by then uninhabited. It is now in the care of the National Trust for Scotland.
In prehistoric times (Pleistocene) Staffa was covered by the ice sheets which spread from Scotland out into the Atlantic Ocean beyond the Outer Hebrides. After the last retreat of the ice around 20,000 years ago, sea levels were up to 125 metres (410 ft) lower than at present. Although the isostatic rise of land makes estimating post-glacial coastlines a complex task, around 14,000 years ago it is likely that Staffa was part of a larger island, just off the coast of mainland Scotland, which would have included what are now Mull, Iona and the Treshnish Isles.
Steadily rising sea levels then further isolated this little island, which is entirely of volcanic origin. It consists of a basement of tuff, underneath colonnades of a black fine-grained Tertiary basalt, overlying which is a third layer of basaltic lava without a crystalline structure. By contrast, slow cooling of the second layer of basalt resulted in an extraordinary pattern of predominantly hexagonal columns which form the faces and walls of the principal caves. The lava contracted towards each of a series of equally spaced centres as it cooled and solidified into prismatic columns, a process known as columnar jointing. The columns typically have three to eight sides, six being most common. The columns are also divided horizontally by cross joints. These columnar jointed sections represent the tops and bottoms of individual lava flows. Between these sections lie regions of much more chaotic jointing, known as the entablature. The origin of the entablature is unknown, but could be due to flooding of the lava flow, causing much more rapid cooling, or the interaction of stress fields from the two regions of columnar jointing as they approach one another.
Similar formations are found at the Giant's Causeway in Northern Ireland, on the island of Ulva and at Ardmeanach on the Isle of Mull. Grooves in the roof of MacKinnon's cave indicate either a pyroclastic flow or a series of eroded ash falls in the rock above the columnar basalt. The 'Staffa Group' is the name given to the series of olivine tholeiite basalts found in the vicinity of Mull which erupted 55–58 million years ago.
Staffa lies about 10 kilometres (6 mi) west of Mull, and 9 km northeast of Iona. It is longitudinally oriented north–south, and is a kilometre long by about half a kilometre wide. The circumference is about 3.8 km in extent. In the northeast the isle shelves to a shore, but otherwise the coast is rugged and much indented; numerous caves have been carved out by rain, streams and sea. There is enough grass to feed a few cattle, and the island has a spring.
On the east coast are Goat Cave and Clamshell Cave. The latter is 10 m high, about 6 m wide at the entrance, and some 45 m long, and on one side of it the ridges of basalt stand out like the ribs of a ship. Near this cave is the pyramidal rock islet of Am Buachaille ('The Herdsman'), a pile of basalt columns seen fully only at low tide. Other outlying rocks include Eilean Dubh to the north-west and a series of skerries stretching for half a kilometre to the south-west. On the southwest shore are Boat Cave and Mackinnon's Cave (named after a 15th-century abbot of Iona), which has a tunnel connecting it to Cormorant Cave. These caves lie to the south-west and can be accessed from the bay of Port an Fhasgaidh at low tide. In 1945 a mine exploded near Boat Cave, causing damage to the cliff face which is still visible. Mackinnon's Cave is 107 metres long.