596 



APPENDIX 



The following table shows the total production in the United States from 

 1867 to 1908: 



MARKETED PRODUCTION or PHOSPHATE ROCK IN THE UNITED STATES, 

 1867-1908, AND EXPORTATION FOR 1899-1908 



Of the total quantity (31,594,279 tons) South Carolina has furnished 

 12,138,454 tons; Florida, 14,087,833 tons; Tennessee, 5,315,422 tons; 

 and other states, 53, 570 tons. In twenty-one years Florida has produced 

 more phosphate than has South Carolina in thirty-two years. 



The phosphate deposits range in age from the Ordovician in Tennessee 

 to the Tertiary in Florida, occurring also in the Devonian in Tennessee 

 and Arkansas, and in the Carboniferous in the Wyoming-Idaho-Utah 

 field. 



Within the last few years a large area of phosphate-bearing rock has 

 been discovered in the western United States. This discovery is of 

 much importance, since it opens a new field in an area which is tributary 

 to the great agricultural region of the Middle West. The phosphate 

 occurs over a considerable area in southeastern Idaho, southwestern 

 Wyoming, and northeastern Utah. It is found in rocks of "Upper 

 Carboniferous" age in a series of shales and limestones, 100 feet thick, 

 within which are several beds of phosphate rock ranging in thickness 

 from a few inches to 10 feet. At the base of the series is a limestone, 

 and 6 to 8 inches of soft brown shale separates this from the principal 

 phosphate bed, which is 5 to 6 feet thick. This phosphate bed is oolitic 

 in character and high in phosphoric acid. There are in the series several 

 other beds ranging from a few inches to 10 feet in thickness, and sepa- 



