CONTENTS AND ILLUSTRATIONS 
27 
Page 
Vesicular and Calcareous Sand Rock in the Overburden- 68 
Overburden Absent or Reduced in Thickness--—>- 68 
Bog Iron Ore in the Overburden- 68 
Secondary Enrichment in the Phosphate Bed- 69 
Fossils of the Land Pebble Phosphate Deposits- 71 
Derived from the Bed Rock-- 7 1 
Derived from Miocene Stream and River Deposits- 7 1 
Contemporaneous with the Phosphate Deposits- 72 
Land Dwelling Animals--- 72 
Marine Animals - 73 
The River Pebble Phosphate Deposits - 76 
Fossils from the River Pebble Phosphate Deposits --- 76 
Local Deposits of River Pebble Phosphates- 78 
Peace Creek - 78 
Alafia River ---— 81 
Manatee River - 82 
North Creek - 82 
Caloosahatchee River- 82 
Black Creek - 83 
Olustee Creek-- 83 
Allapaha River--- 83 
Sopchoppy River- 83 
Relation Between the Hard Rock and the Pebble Phosphates of Florida— 84 
ILLUSTRATIONS. 
Page 
Fig. 1. Map to show the location of phosphate deposits in Florida -- 30 
Fig. 2. View to show overburden of the land pebble phosphate- 42 
Fig. 3. Mining River pebble phosphate- 44 
Fig. 4. Diagrammatic sketch to show the structure of Florida- 53 
Fig. 5. Diagrammatic sketch to show conditions under which the land peb¬ 
ble phosphates were accumulated-<- 59 
Fig. 6. Unconformity in the phosphate bed- 62 
Fig. 7. Top view of land tortoise- 70 
Fig. 8. Part of lower jaw of a gavial- 74 
Fig. 9. Side view of land tortoise_:_ 75 
Fig. 10. Jaw and teeth of Chlamytherium_ 80 
Fig. 11. Ostrea from the Bone Valley formation_ 83 
Fig. 12. Tooth of the elephant —- 85 
Fig. 13. Alum Bluff on the Apalachicola River- 87 
Fig. 14. View in Pit of Pembroke Mine- 89 
Fig. 15. Mining phosphate rock by hydraulic method- 89 
Fig. 16. Phosphate washer- 89 
Fig. 17. Pit of Palmetto Phosphate Company- 91 
Fig. 18. Pit of Pierce Phosphate Company- 91 
Fig. 19. Plant of the Pierce Phosphate Company- 91 
Fig. 20. Sample of Phosphatic Marl from Black Creek-- 93 
Fig. 21. Sample from Phosphate Bed - 93 
Fig. 22. Phosphate Pebbles washed from the Bed Rock -- 95 
