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Figure 4 - Not getting the drift. A hard look at the early history of plate-tectonic ideas

Figure 4. Hopkinsʼ Plate 6. The upper drawing is a vertical section, and the lower drawing is the same, but cut horizontally. In Hopkinsʼ drawings, the massive coarse-grained Granite is progressively transformed from south to north; first to coarse-grained Gneiss with oriented minerals, and then to finer grained and more micaceous Schist. In modern geology we know that such changes can take place, but not in a south-to-north transition. From Hopkins (1844).
Hopkinsʼ Plate 6. The upper drawing is a vertical section, and the lower drawing is the same, but cut horizontally. In Hopkinsʼ drawings, the massive coarse-grained Granite is progressively transformed from south to north; first to coarse-grained Gneiss with oriented minerals, and then to finer grained and more micaceous Schist. In modern geology we know that such changes can take place, but not in a south-to-north transition. From Hopkins (1844).
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