The much beloved author John M. Downs published his account of the Isles of Shoals in 1944 after a lifetime living among the people who took part in the fishing, hotel and contemporary communities. He summarizes his need to write his own story this way:
Many stories have been written about the Isles of Shoals. Mine is to be a series of recollections–“Sprays of Salt.” I played on the rocks, a unrealizing child, as the poets and artists worked talents about me. The ocean they praised and painted was the ocean I owned and for seventy years this ocean owned me (Preface).
Down’s account of his life – told in vignettes – represents one of the most honest and clear view of the Isles. It’s one in which he quotes directly from numerous other sources. He writes:
The Isles are absolutely just rocks planted bleakly by some of nature’s craftmanship in the midst of a section of the ocean vaulted over by an everchanging sky and completely surrounded by the blue, green, temperamental waves which at times lapped the shores in listing submission and at others would dash thundering against the shores in a revolutionary tumult” (12).
Continuing from our last post using Frank Preston Stearns’s Sketches from Concord and Appledore of1895, now a look at the geology of the islands:
Their geological structure is more interesting. It is generally supposed that the soil of New England rests on a foundation of primeval granite but it is not exactly that. There is very little true granite in New England, what is taken for it commonly being syenite, a rock indeed that differs from granite only in the substitution of horn-blend for mica.
Above Stearns is describing syenite which modern geologists describe as a coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or present in relatively small amounts (<5%).
The so-called Quincy granite is a finer sort of syenite, which in the White Mountains are composed of syenite kept with granite. The Isles of Shoals are also mostly syenite, but there are large boulders of coarse granite lying about, and in some places the syenite changes suddenly to granite as if the two had been welded together. Then there are dykes of dark brown trap or ancient lava, from four to ten feet wide running across the island from south-west to north-east, and others again at right-angles to these.
If you recall, or look back to the last post, you’ll notice that Stearns comments that the Islands were never mountain tops. Here he describes how they may actually have formed due to volcanic action millions of years ago.
This would seem to indicate that the elevation of the surrounding plateau was due to volcanic action. The structure of White Island is very different from the others, a large portion of the rock being studded with innumerable garnets, while veins of some greyish white minerals run through it in which there are still smaller garnets.
Sterans, Frank Preston (1895) Sketches from Concord and Appledore. G.P. Putnam and Sons: New York.