Edinburgh Hard Rock Cafe classic pin

Edinburgh Hard Rock Cafe classic pin

The geology of the Edinburgh, Scotland area.

The geology of the Edinburgh, Scotland area.

Ediinburgh is, I suppose, my favorite city in Scotland. I love Military Tattoo performed there every August. I am also very much interested in the geology of Edinburgh. The castle is perched atop an old eroded volcanic plug. Below is a geological map of the area. This pin is from the Hard Rock Café on the upper level of the city.

Edinburgh Castle Rock

The imposing rock that the famous Edinburgh Castle was built on, is a plug formed from one of the vents of Arthur’s Seat (see above).  The base of the plug can be studied on almost three sides, although steep grassy slopes prevent direct access to parts of it.  The rock is also famous for its ‘partner’ – the Royal Mile (or High Street).  The street slopes gently to the east, away from the Castle and leads to Holyrood Palace near the foot of Arthur’s Seat.

This whole feature is a crag-and-tail, formed during the last ice-age.  The glaciers, travelling from the west, were deflected around the hard volcanic rock, leaving uneroded soft sedimentary rock lying behind it.  Two shallow valleys lie to the north and south of the rock, gouged out from the deflected ice.  These are Princes Street Gardens and the Grassmarket and Cowgate.  The junction between the ‘crag’ and the ‘tail’ can be studied from Johnston Terrace, Princes Street Gardens and within Edinburgh Castle itself.

Ariel view of Edinburgh and the castle atop the rock

Ariel view of Edinburgh and the castle atop the rock

Location: 02-D5

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