Showing posts with label basalt. Show all posts
Showing posts with label basalt. Show all posts

Friday, 21 June 2013

The Giant's Causeway

Giant's Causeway. Looking SE. Columnar jointing in tholeiitic basalt. The columns are usually from five to seven sided with ball and socket cross-joints.  Old photograph number:  NI00708
BGS image ID: P006483
Giant's Causeway. Looking SE. Columnar jointing in tholeiitic basalt. The columns are usually from five to seven sided with ball and socket cross-joints. 
Old photograph number: NI00708

Giant's Causeway. Looking SE. Columnar tholeiitic basalt, showing ball and socket cross-jointing. The cross-joints are upward and downward facing in apparently random pattern. Old photograph number:  NI00706
BGS image ID: P225384
Giant's Causeway. Looking SE. Columnar tholeiitic basalt, showing ball and socket cross-jointing. The cross-joints are upward and downward facing in apparently random pattern.
Old photograph number:  NI00706
Giant's Causeway. Looking N. The Middle Causeway. Columnar tholeiitic lava. Old photograph number:  NI00710
BGS image ID: P225386
Giant's Causeway. Looking N. The Middle Causeway. Columnar tholeiitic lava.
Old photograph number:  NI00710

Bob McIntosh

Monday, 1 April 2013

The Rock and Spindle, 3.621 km. east of St. Andrews. Fife Region.

The 'Rock and Spindle', 3.621 km. east of St. Andrews. Fife Region
BGS image ID: P000250
The 'Rock and Spindle', 3.621 km. east of St. Andrews. Fife Region. The prominent low stack in the vicinity of the Kinkell Ness Vent is a volcanic 'neck' within the Carboniferous Calciferous Sandstone Series. The radiating spokes of the 'Spindle' are columnar jointed basanite (basalt) and are relatively free from xenoliths while the rest of the stack into which the spindle grades without any sign of contact is basalt containing many xenoliths, igneous towards the centre and masses of sedimentary rocks, sandstones and limestones up to two metres across around the outside.

BGS old photograph number: B474. Whole Plate.
Photographer: R. Lunn
Date of photograph: 1895

Bob McIntosh