The Stonehenge bluestones are of volcanic and igneous rocks, the most common of which are called dolerite
The occurrence of dolerite
intrusions in the southern Baltic Sea was first reported in the 1980s after the drilling of two offshore oil exploration wells, D1-1 and C8-1 (Fig.
fourstar Oasis, from The sea cliff is said to resemble a kilt, with vertical basalt columns forming the pleats and intruded sills of dolerite
forming the pattern.
my earliest memory: a radiant moon silently rising above the rim of our backyard in its light I saw my slender shadow fall endlessly through a craggy, cold eternity- there where I stood in a landscape of dolerite
by day a Namaqua woman looked after me her clicking speech echoed in my Afrikaans a magnet that must hold me here in the moon's trance the language that has me holding on tight as across Africa's cracked lip its fevered breath blows hard
And next moment we're swerving between massive dolerite
columns and cliffs in jet- boat style, ensuring we hit neither.
For nearly a century it has been known that the 80 or so pillars of dolerite
, rhyolite and tuff, collectively known as 'bluestones', that were incorporated into the structure of Stonehenge, Wiltshire, originated over 220km away to the north-west in the Preseli Hills of southwest Wales (Thomas 1923).
During the summer, tens of thousands of birds, including more than 36,000 pairs of puffins, over 1,000 pairs of Arctic Turns, 1,900 breeding shags, and even a few Shelduck, Ringed Plovers, Barn Swallows and Rock Pipits visit the islands' igneous dolerite
outcrops that once provided homes to saints like Aidan and Cuthbert.
However, some scientists who have studied the unique geology of the Karoo, with its widespread intrusion of dolerite
dykes and sills, have expressed concern that there exists the possibility of contaminants reaching the groundwater system.
Stony Brown Dermosols (Isbell 2002) (Luvisols; IUSS Working Group WRB 2007) have formed on Jurassic dolerite
hills to the south.
Thomas identified Carn Meini as the source of spotted dolerite
bluestones, but a new analysis of the rocks' chemical makeup has fingered Carn Goedog as the true home of at least 55 percent of those used at Stonehenge, according to Planet Earth.
39]Ar dates using samples of freshest-available dolerite
from dyke exposures at Christmas Cove (South Bristol, Maine), Spruce Point (Boothbay Harbor), and Doyle Point (Yarmouth); the Caraquet Dyke on the NW side of the Mattawamkeag River near Bancroft, Maine; and the Higganum Dyke in a road cut in Hurd State Park near Haddam, Connecticut.
We soon pass a large mass of rock composed of dolerite
with layers of sandstone and shale at its base and, after crossing a wooden footbridge, steps take us over a wall.