10
EXPLANATION OF PLATE I.
Explanation of Letters and Figures used in the references to unstratified and crystalline Rods in Plate 1.
| a. Granite. | b. Sienite. | c. Porphyry, |
| d. Greenstone. | e. Serpentine. | f. Basalt, or Trap, |
| g. Trachyte. | h. Products of Extinct Volcanoes. | |
| i. Products of Active Volcanoes. | ||
a. 1.—a. 3. Mountains of Granite, raised into lofty ridges, from beneath Gneiss and Primary Slates.
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a. 4. Granite intermixed with Gneiss.
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a. 5.—a. 8. Granite, subjacent to stratified rocks of all ages, and intersected by volcanic rocks.
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a. 9. Granite Veins, intersecting Granite, Gneiss, and primary Slate.
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a. 10. Granite Vein, intersecting Primary and Transition rocks, and forming overlying masses at the surface.
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a. 11. Granite Vein intersecting Secondary strata, and overlying Chalk.[1]
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b. Dikes of Sienite.
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b. 1. Overlying masses of Sienite.
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c. Dikes of Porphyry.
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c. 1. Overlying masses of Porphyry.
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d. Dikes of ancient Greenstone.
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d. 1. Overlying masses of the same. The Rocks represented by d. and e. often pass into one another.
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e. Dikes of Serpentine.
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e. 1. Overlying masses of Serpentine.
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f. Dikes and intruded subterraneous masses of Basalt.
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f. 1. to f. 7. Masses of Basalt protruded through, and overlying strata of various ages.
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- ↑ In the locality quoted in the Explanation of Plates, Vol. II. p. 5, the Granite which comes to the surface over the Chalk, is not covered by Tertiary deposites, as represented in our section, Pl. 1.
