Transactions . Alumina, AI2O3, Lime, CaO, Magnesia, MgO, Sulphuric acid, SOs, Potash, K-20, ....... trace Soda, Na20 trace trace THE CEMENT-MATERIALS OF SOUTHAVEST ARKANSAS. 55 I.—Specimen from gully near surface, 11 south, 27 west,Section 35, northeast quarter of the northeast quarter. II.—Specimen from block plowed up in field, same sectionand quarter. Mr. Jones tells me that a similar rock is found in the north-east quarter of Section 32, in the west half of 27, and in thewest half of 26. The Upper or Saratoga Chalk
Transactions . Alumina, AI2O3, Lime, CaO, Magnesia, MgO, Sulphuric acid, SOs, Potash, K-20, ....... trace Soda, Na20 trace trace THE CEMENT-MATERIALS OF SOUTHAVEST ARKANSAS. 55 I.—Specimen from gully near surface, 11 south, 27 west,Section 35, northeast quarter of the northeast quarter. II.—Specimen from block plowed up in field, same sectionand quarter. Mr. Jones tells me that a similar rock is found in the north-east quarter of Section 32, in the west half of 27, and in thewest half of 26. The Upper or Saratoga Chalk near Washington.—The outcropof the upper or Saratoga chalk-bed is not continuously exposedfor any great distance; it is for the most part concealed by soilor by an overwash of soil, sands and gravels. The exposures,however, show that it extends from the face of the hill, justeast of Saratoga, to Columbus, this latter town standing on orvery near its northern margin. From this place it strikes in Fig. Section through Washington. the direction of Washington, but about a mile west of that townit swings northward and crosses the railway on top of the water-shed between Washington and Ozan. The diagram, Fig. 5, giving the succession of rocks at Sara-toga, shows also the succession for Washington and the bedsunderlying that place. A section at Washington is shown inFig. 6. It will be seen that the sections are geologically Washington, however, the chalk-beds are exposed in therailway-cuts on the water-shed north of and higher than thetown, while at Saratoga they are at the base of the hill thatslopes away to the north, and are lower than the town. The Washington exposures examined are in the railwa}T-cutsin 11 south, 25 west, about Section 9, about 2J miles northand a little west of Washington. Approaching the exposuresby the railway-track from the south, the first one shows 7 feet 56 THE CEMENT-MATERIALS OF SOUTHWEST ARKANSAS. of light-gray chalk at the top o
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
