. The Southern States. f rock in this manner, thepiles often containing looo or 1500 method has largely been abandonedand the cylindrical rotary drier is beingused instead, as more efficient and moreeconomical. The pebble when dried iscarried by chain and bucket conveyorsto great storage bins, which are heavilytimbered buildings often holding asmuch as 4000 or 5000 tons. Whencars are to be loaded for shipment the vaded that region. Mr. N. H. Darton,of the United States GeologicalSurvey, advances the theory thatguano was the original source ofthe phosphate of lime which replacedthe ca
. The Southern States. f rock in this manner, thepiles often containing looo or 1500 method has largely been abandonedand the cylindrical rotary drier is beingused instead, as more efficient and moreeconomical. The pebble when dried iscarried by chain and bucket conveyorsto great storage bins, which are heavilytimbered buildings often holding asmuch as 4000 or 5000 tons. Whencars are to be loaded for shipment the vaded that region. Mr. N. H. Darton,of the United States GeologicalSurvey, advances the theory thatguano was the original source ofthe phosphate of lime which replacedthe carbonate of lime of the N. A. Pratt is satisfied that thephosphate boulders are the fossil remainsof a low order of animal life, whichsecreted a skeleton composed of phos-phate of lime, just as the coral animaldeposits a skeleton of carbonate of Cox expresses his opinion thatthe phosphate deposits of Florida aredue to the mineralization of an ancient THE FLORIDA PHOSPHATE INDUSTRY. 355. DREDGING ROCK PHOSPHATE IN BLUE RIVER. guano. Mr. Walter B. M. Davidsonholds that the underlying limestone ofFlorida contained a small percentage ofinsoluble phosphate of lime which nowremains after the carbonate of lime hasbeen dissolved and washed away. Fromthese various theories and opinions thereader may make his own evidences of this swarminganimal life are presented by the fossilremains in the phosphate trom the numerous quantitiesof these remains, it would seem as ifthis region once were fairly crowdedwith life, for the bones are unearthed bytons, huge mastodon bones, teeth andtusks, ribs of smaller animals and theteeth of sharks by millions. Occasion-ally bones in natural condition are foundbut most of them are of fossil in\^estigators made the mistake ofsupposing that the deposits of phosphateof lime came from these bones, but ithas been demonstrated that the reverseis the case, the bones having beenfo
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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectagriculture
