A Study of the Igneous Rocks At York Haven And Stony Brook Pa And Their Accomp
A Study of the Igneous Rocks At York Haven And Stony Brook Pa And Their Accomp
Frederick Ehrenfeld
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The interesting fact was noticed here that some of the boulders when struck possessed great resonance. Of two pieces lying side by side, one when struck rang almost like a phonolite, while the other did not have this property. As the fragments were seemingly alike in all other respects, the difference was probably due to some difference in their position in the ground. At the railroad cut at Stony Brook the dike is well exposed and its width easily measured ; it is seventy-four feet wide. Its c...ontact with the limestone is sharp and distinct. At this point the dike makes a small elevation, which soon fades away. The limestone adjoining the dike is highly crystalline, but contains no secondary crystallizations of minerals. It is whitish in color, with thin blackish streaks. There are also some thin beds of shale. Perhaps the most striking feature of the limestone here is a layer of conglomerate, differing from ordinary rocks of this name in the fact that the material is all limestone. It has probably resulted from the cementing together of limestone pebbles and fossils, which have since been altered 1 Report C, Pa.
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