On the opposite shore is a singular jutting angle of the shales, forming the principal feature of the low cliffs at the water's edge. Turner fastens on it as the only available mass; draws it with notable care, and then magnifies it, by diminishing the trees on its top to one fifth of their real size, so that what would else have been little more than a stony bank becomes a true precipice, on a scale completely suggestive of the heights behind. The hill beyond is in like manner lifted into a more rounded, but still precipitous, eminence, reaching the utmost admissible elevation of ten or twelve hundred feet (measurable by the trees upon it). I have engraved this entire portion of the drawing of the real size, on the opposite page; the engraving of the whole drawing, published in the England Series, is also easily accessible. [Illustration: FIG. 83.] Sec. 33. Not knowing accurately to what group of the Yorkshire limestones the rocks opposite the Abbey belonged, or their relation to the sandstones at the Strid, I wrote to ask my kind friend Professor Phillips, who instantly sent me a little geological sketch of the position of these "Yoredale Shales," adding this interesting note: "The black shales opposite the Abbey are curiously tinted at the surface, and are contorted. Most artists give them the appearance of solid massive rocks; nor is this altogether wrong, especially when the natural joints of the shale appear prominent after particular accidents; they should, however, never be made to resemble [i.e. in solidity] limestone or gritstone." Now the Yoredale shales are members of the group of rocks which I have called slaty coherents, and correspond very closely to those portions of the Alpine slates described in Chap. X. Sec. 4; their main character is continual separation into fine flakes, more or less of Dante's "iron-colored grain;" which, however, on a large scale, form those somewhat solid-looking masses to which Mr. Phillips alludes in his letter, and which he describes, in his recently published Geology, in the following general terms: "The shales of this tract are usually dark, close, and fissile, and traversed by extremely long straight joints, dividing the rock into rhomboidal prisms" (i.e. prisms of the shape _c_, Fig. 83, in the section). Sec. 34. Turner had, therefore, these four things to show:--1. Flaky division horizontally; 2. Division by rhomboidal joints; 3. Massy appearance occasionally, somewhat concealing the structure; 4. Local contortion of the beds. (See passage quoted of Mr. Phillips's letter). [Illustration: FIG. 84.]