. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. 81 Fig. bed above the lowermost strata. In other words, if the dike makes an acute angle with the upper sur- face of the coal-vein, the strata are elevated on that side; while, if the angle is obtuse, they are thrown down. The extent of vertical displacement occasioned by faults varies from a few inches or feet to thou- sands of feet. It is not uncommon in coal-fields to find the strata raised on one side of the dike to the extent
. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. 81 Fig. bed above the lowermost strata. In other words, if the dike makes an acute angle with the upper sur- face of the coal-vein, the strata are elevated on that side; while, if the angle is obtuse, they are thrown down. The extent of vertical displacement occasioned by faults varies from a few inches or feet to thou- sands of feet. It is not uncommon in coal-fields to find the strata raised on one side of the dike to the extent of 5 or 600 feet. There are scarcely any phenomena in geology which prove more con- clusively the application of a powerful internal force than the displacements under consideration. Sometimes they extend from, 20 to 40 miles in length; and all the rocks which have been disturb- ed by any fault have experienced on one side the same movement and to the same extent, excepting only those portions which have been subjected to violent pressure. It has been remarked, that min- eral veins are not otherwise different from faults than by reason of the fissures which these have opened in the rocks being filled with spongy and metallic matters. This filling of a fissure consti- tutes a mineral vein; a similar fissure, filled by ba- saltic or other rocks, would be called a rock dike,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lee, Charles A. (Charles Alfred), 1801-1872; Draper, Daniel, 1841-1931, donor. DSI. New-York : Harper & Brothers
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Keywords: ., bookcentury1800, bookpublishernewyorkharperb, booksubjectgeology
