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Updated: May 14, 2025
On the evening of the next day, there was a thunderous knock at Warburton's flat, and in rushed Franks. "You were at Ashtead yesterday," he cried. "I was. What of that?" "And you didn't come to tell me about the Elvans!" "About Miss Elvan, I suppose you mean?" said Will. "Well, yes, I do. I went there by chance this afternoon. The two men were away somewhere, I found Mrs.
Next we find, in the same county, that elvans, or straight dikes of porphyritic granite, have cut through the granite and the veins before mentioned, but have not penetrated the Devonian rocks.
A few fragments also of tin found in Wicklow in the drift are supposed to have been derived from veins of the same age. Next, if we turn to Cornwall, we find there also the monuments of a very analogous sequence of events. Here, then, the tin lodes are newer than the elvans.
This granite, like the syenitic granite of Christiania, has broken through the stratified formations, on the north-west side of Dartmoor, the successive members of the culm-measures abutting against the granite, and becoming metamorphic as they approach. These strata are also penetrated by granite veins, and Plutonic dikes, called "elvans."
Subsequently to these elvans, veins of copper and lead were produced, being of a date certainly posterior to the Silurian, and anterior to the Devonian; for they do not enter the latter, and, what is still more decisive, streaks or layers of derivative copper have been found near Wexford in the Devonian, not far from points where mines of copper are worked in the Silurian strata.
It has, indeed, been stated by some Cornish miners that the elvans are in some instances posterior to the oldest tin-bearing lodes, but the observations of Sir H. de la Beche during the survey led him to an opposite conclusion, and he has shown how the cases referred to in corroboration can be otherwise interpreted.
Her father, by no means forward to speak of himself and his pursuits, was led in that direction by Peak's expressions of interest, and the two were soon busied with matters which had a charm for both. A collection of elvans formed the starting-point, and when they had entered upon the wide field of palaeontology it was natural for Mr.
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