FIG. 1. Scale ¹⁄₆₀ inch to the foot. This represents a section of a shaft sunk by the Kimberley Mining Board, at the N. E. of and about 700 feet from the then margin of the mine. The section was taken by Mr. Geo. Jas. Lee, a gentleman who was at one time chairman of the mining board, and who, when it finally decided to abandon the shaft named in 1878, took the section of which the accompanying diagram or illustration gives an accurate representation. The dip of the strata is about 2°.5 N. N. W. (_a_) Represents a heap of diamondiferous débris from the yellow ground of the mine, 14 feet in depth. (_b_) Surface red sand, 6 feet thick. There was no calcareous tufa underlying the red sand here, as is usually the case within the mine proper and its immediate vicinity. (_c_) Jointed trap, or blue whin, 15 feet. (_d_) Light colored shales; bluish white, olive yellow, gray, etc., 25 feet. This layer, surrounding and joining the mine, is 50 feet thick, and contains many fossils, some of which are shown in the following plates. (_e_) Black, or bluish black carboniferous shale, containing four or five “iron bands,” or limonite (marked _f_), from 1 inch to 1 foot thick. This layer is 225 feet thick, and in addition to many fossils also contains numerous flat-rounded pieces of black shale, of a harder nature than the body of the reef, and generally with a _septum_ dividing the nodules. Water has evidently worn the masses down on each side of this hard division, often giving them the appearance of oyster, mussel and other shells, also of fish and other forms. One such stone amongst many (marked with an arrow) was found just above the hard rock, which here commences. (_g_) A trachyitic _breccia_ of specific gravity 2.815. This is of a very tough, horny nature, and of a pale bluish gray color, sprinkled with small particles, both angular and round, of a darker color (3 feet). (_h_) Compact augitic, or hornblendic, very tough (8 feet). (_i_) Seamy do. do., closely resembling basaltic trap, 4 feet worked, but of unknown depth. The total depth of the working represented in the diagram is 300 feet, and was the deepest working in the Kimberley mine at the time that it was abandoned.[29] FIG. 2. This represents a diagrammatic section of the interior of the Kimberley mine, from the surface to a depth of about 300 feet, and made up as follows: (_a_) Grass, etc. (_b_) Red sand as in Fig. 1, 6 feet. (_c_) Calcareous tufa, 6 feet. (_d_) Yellow diamondiferous ground, 25 feet. At the junction of the “yellow” and “blue” the change of color previously alluded to is shown, and also the porous layer with water oozing from it, and trickling down the “face” of the claim. (_e_) “Blue ground” with various “greasy seams;” (_f_) and boulders. PLATE II.