126 OVER ON THE ISLAND The Island is alive! "Do you realize," the older man interrupted my thoughts, "that the Island belongs to the Permian and Triassic eras?" "Why . . ."began Jean. "... no!" I finished. "It is. But mostly Permian. There are several anticlines at different places on the Island. There is red sandstone, arenaceous shale, calcareous sandstone, and pebble conglomerates as well." "Fancy that!" "Fossils have been found, too," continued our visitor enthusiastically. "At New London , they dug up, quite a while ago, the jaw of a large carnivorous reptile. It was the second real discovery of saurian bones in the new red sandstone of America." "Wonderful. Wonderful," Jean yawned. "And what became of it? " "It was bought by the Academy of Natural Sciences, Philadelphia. Have you ever been to ?" "No." "A dark mass of dolerite came through the sand¬ stone there. It's well worth seeing. " "What is it like?" " It is a dyke or diabase . . ." "Just what I thought," commented Jean pleasantly. "It is volcanic and was ejected from the interior of the earth while still molten. Naturally it hardened and altered the strata with which it came in contact." "Naturally." "You know, a great glacier once covered this terri¬ tory. That accounts for the granite boulders, and the moraines." "The what?"