P002871

Uploaded on:
2009-02-14 05:09:43.0
Type:
Digital Asset
File Size:
356.19 KB
Dimensions:
1000 x 783 pixels
276 views 6 downloads
P number: P002871
Old photograph number: D03464
Caption: Spectacular columnar jointing of Samson's Ribs, Arthur's Seat, Holyrood Park, Edinburgh, Midlothian.
Description: Spectacular columnar jointing of Samson's Ribs, Arthur's Seat, Holyrood Park, Edinburgh, Midlothian. This is a strikingly columnar intrusion of Dunsapie-type olivine basalt within the south-western margin of the Arthur's Seat vent. It is believed to have formed a feeder channel to adjacent lava flows within the vent. Erosion since Carboniferous times has stripped off the rocks surrounding the volcano and revealed these intrusions within the vent. The columns commonly seen in sheet-like basaltic intrusions and lavas develop from cooling joints arranged in a roughly hexagonal pattern on the cooling surface of the body. As the body cools, these joints propagate through the thickness of the body, perpendicular to this surface, to give the columnar effect.
Date taken: Tue Jun 01 00:00:00 BST 1982
Photographer: Bain, T.S.
Copyright statement: NERC
Acknowledgment: This image was digitized with grant-in-aid from SCRAN the Scottish Cultural Resources Access Network
X longitude/easting: 327400
Y latitude/northing: 672500
Coordinate reference system, ESPG code: 27700 (OSGB 1936 / British National Grid)
Orientation: Landscape
Size: 356.19 KB; 1000 x 783 pixels; 85 x 66 mm (print at 300 DPI); 265 x 207 mm (screen at 96 DPI);
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