NJDEP - NJGS - First Annual Report of the Geological Survey of the ...

7_(t) (2) _8)Silex, . 49.83 48.50 53.26Alumina_ . . 6.00 7.30 3.85Protoxid of iron, oi.53 22.80 24.15. Potash, . 10.12 11.50 5.36Soda, . 1.60Lime, . .50 or less. 1.73_,Iagnesia, . 1.83' . traoe. 1.10Water_ . . 9.80 7.90 10.12Loss, .89I100.00 99,50, 101.17The preceding statements and analytical results Show thatthe subject is by no means u plain one. To me it is one ofdeep interest, and I have taken every pains to inform myselfupon the practical agriculture of the district, and the influencewhich marl has exerted in bring'ing it to its present high Con.dition. With this knowledge my chemical examinations hav6been conducted, but they are not yet in suc h a state of forwardnessas to be presented complete. Z. f_w approximate •results will be given.In the.following table the amounts of phosphoric acid" and,lime are given, in the fim_ and second columns. They areaverages from several analyses of specimens from diff&entpits. The third and fourth columns give the _nount of phosph.3teand carbonate of llme. The phosphate is calculatedfrom the phosphoric acid, and it probably exists in the marlin this form. The'only doubt of it arises from the fact thatphgsphate of iron is a common mineral in this Stratum. Carefulexaminations have not been made to determine the amount_of potash and soda ; enough, he,rover, has beeh done to showthat they are always present, bud constituting fi'om five to tenper cent. of the whole.tNEW JERSEY GEOLOGICAL SURVEY