. History of the town of Hingham, Massachusetts . of six feet. There are two others not far distant havingthe same general direction, each about two feet wide. Stillanother was noticed of less width than either mentioned, havingpieces of granite, through which it had cut, enclosed. Beach near Summer Street. — On the beach east of Herseyswharf, near the steamboat landing and about ninety yards from it,may be seen a trap dike running east and west, having a width ofnine feet. This dike has veins of epidotc. About twenty-eight yards beyond this there is another east andwest dike of the same chara
. History of the town of Hingham, Massachusetts . of six feet. There are two others not far distant havingthe same general direction, each about two feet wide. Stillanother was noticed of less width than either mentioned, havingpieces of granite, through which it had cut, enclosed. Beach near Summer Street. — On the beach east of Herseyswharf, near the steamboat landing and about ninety yards from it,may be seen a trap dike running east and west, having a width ofnine feet. This dike has veins of epidotc. About twenty-eight yards beyond this there is another east andwest dike of the same character, which is somewhat irregular andintermixed with granite, but showing, where distinct, a width oftwo feet. Fifty yards farther a dike is reached which crosses the beachin the granite, and which is particularly interesting, because itshows within its body a continuous mass of granite which wastorn from the walls of that rock and enclosed in the igneous ma-terial, when this was irrupted from beneath in a molten condi-tion. See Figure No. Figure No. 2. One hundred and twenty-five feet farther east a small cove,called Mansfields Cove, is reached, where may be seen just at its 36 History of Hingham. entrance a dike six feet in width, of porphyritic texture and par-tially decomposed, its direction being, like the others, east andwest. The cove is about ninety feet deep, and is bordered on its south-erly side by granite, having here and there more or less mixtureof trap. Some Melaphyr is also seen in juxtaposition with thegranite, and this rock also appears on the adjoining land near,but to a limited extent. Martins Lane. — On the right of Martins Lane and justbeyond its termination, a dike may be observed within granitewalls, having an east and west direction and traceable 100 width is about six feet. JOINTS. Joint structure properly finds place here, as all the rocks of thetown exhibit it, and none more than the granites. Probably there can be found no reader of
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