a line of variation typically a lighter color than the surrounding area often found in sedimentary rocks typically run parallel to each other can be curved or straight can appear in different colors, such as red, white, or black
striation which is a line of variation striation which typically a lighter color than the surrounding area striation which often found in sedimentary rocks striation which typically run parallel to each other striation which can be curved or straight striation which can appear in different colors, such as red, white, or black