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The Long Row Lava Flow

The Long Row

The rocks on Whinny Hill, to the north and north-east of the summit of Arthur's Seat, consist of lava flows with interbedded tuffs. The Long Row is a basalt lava flow with crude colmnar jointing. The extrusive nature of this unit is established by irregularities at the top, filled with basaltic ash. Immediately beneath the Long Row is a thin irregular sill known as the Dasses.

The Long Row is an important marker horizon because it continues on the far side of the Arthur's Seat vents. It is quite clear that the Long Row lava flow was extruded over the surface before the vents were formed.

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