"Trappean" Quotes from Famous Books
 ... Trachytic Rocks. Special Forms of Structure. The columnar and globular Forms. Trap Dikes and Veins. Alteration of Rocks by volcanic Dikes. Conversion of Chalk into Marble. Intrusion of Trap between Strata. Relation of trappean Rocks to the ...
— The Student's Elements of Geology • Sir Charles Lyell
... the assumed want of analogy between geological causes and those now in action. By what train of investigations were geologists induced at length to reject these views, and to assent to the igneous origin of the trappean formations? By an examination of volcanos now active, and by comparing their structure and the composition of their lavas ...
— The Harvard Classics Volume 38 - Scientific Papers (Physiology, Medicine, Surgery, Geology) • Various
... fresh-water fossils is conclusive proof that the lava-flows associated with such beds cannot be submarine. The hypothesis that the lower beds of traps were poured out in a vast, but shallow, freshwater lake extending throughout the area over which the inter- trappean limestone formation extends appears to be extremely improbable. The lava seems to have been poured, during a long succession of ages, over a land surface, uneven and broken in parts, 'with intervals of rest sufficient for lakes, stocked with fresh- water ...
— Rambles and Recollections of an Indian Official • William Sleeman
... under our feet was everywhere furrowed by Dead men's graves, and generally covered with the granulated lava, aptly named by the settlers buck-shot, and found throughout the country on these trappean 'formations. Buck-shot is always imbedded in a sandy alluvium, sometimes several ...
— A Dictionary of Austral English • Edward Morris |
