| 11. | In 1907, scientists Darton and O'Harra decided that Devils Tower must be an eroded remnant of a laccolith.
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| 12. | She carried her investigations to the Ortiz Mountains of New Mexico, which belong to the laccolith type of extinct volcano.
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| 13. | It is situated within the Gunnison National Forest and is of a geologic formation called a " laccolith ".
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| 14. | After erosion exposed the laccolith, volcanic activity continued and the youngest flows are 1-1.6 million years old.
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| 15. | Mashuk is a laccolith with a crystal nucleus, buried under sedimentary rock ( limestone and marl of Upper Cretaceous and Palaeogene ).
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| 16. | For instance, Devils Tower in Wyoming was thought to be a volcanic neck, but study has revealed it to be an eroded laccolith.
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| 17. | More than of rock which used to exist on top of Square Butte has subsequently eroded to reveal the igneous rock which forms the laccolith.
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| 18. | Folds form under varied conditions of compaction or due to the effects of a high-level igneous intrusion e . g . above a laccolith.
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| 19. | He coined the term " laccolite " ( now laccolith ) to describe the characteristic shapes of some of the igneous intrusions that core the mountains.
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| 20. | In a normal laccolith the intruded material has a flat lower surface and a convex upper surface so that it is more like half a lens in shape.
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