On the elements of picturesque scenery, considered with reference to landscape painting (1846)
Twining, Henry · London : G. Barclay · leaf 78
ar, composed of a series of green sand, red marl, and chalk, with a slight dip, so that the different strata are not on the same level with the eye at all points of sight, but as the escarp- ments and projections of the cliffs are irregular, so do the lines of stratification and the alternations of…
Landscape painting
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.