...sometimes filled with " dykes," or masses of unstratified rocks. It is in the immediate neighborhood of masses of unstratified rock that the stratified...into thinner layers; and although the surfaces of divisions of the thinner layers are often parallel to those of the strata, they are also often oblique...

...subdivided by natural joints, usually in positions nearly at right angles to the plane of stratification. Besides its principal layers or strata, a mass of...in general capable of division into thinner layers : the structure of the rock is then said to be laminated. The laminae or thin layers are often parallel...

...veins or dikes are often accompanied by a "fanlt" or abrupt alteration of the level of the strata. Besides its principal layers or strata, a mass of...more strongly in a direction perpendicular to their laminae than parallel to them; they are more tenacious in a direction parallel to their laminae than...

...or dikes are often accompanied by a "fanlt" or abrupt alteration of the level of the strata. Resides its principal layers or strata, a mass of stratified...more strongly in a direction perpendicular to their laminae than parallel to them; they are more tenacious in a direction parallel to their laminae than...

...the work is much facilitated by taking advantage of them. sion between these layers than elsewhere. Besides its principal layers or strata, a mass of...and, although the surfaces of division of the thinner lavers are often parallel to those of the strata, they are also often oblique or even perpendicular...

...forces. It is easier to divide them at the planes of division between these layers than elsewhere. Besides its principal layers or strata, a mass of...of division into thinner layers ; and, although the surf sices of division of the thinner layera arc often parallel to those of the strata, they are also...

...veins or dikes are often accompanied by a "fault" or abrupt alteration of the level of the strata. Besides its principal layers or strata, a mass of...more strongly in a direction perpendicular to their laminae than parallel to them; they are more tenacious in a direction parallel to their laminae than...

...forces. It is easier to divide them at the planes of diviI sion l>et\veen these layers than elsewhere. Besides its principal layers or strata, a mass of...more strongly in a direction perpendicular to their lamina' than parallel to them; they are more tenacious in a direction parallel to their lamina1 than...

...sometimes filled with " dykes," or masses of unstratified rocks. It is in the immediate neighborhood of masses of unstratified rock that the stratified...into thinner layers ; and although the surfaces of divisions of the thinner layers are often parallel to those of the strata, they are also often oblique...