CONTENTS.
PAGE.
The Hard Rock Phosphate-Dunnellon formation...................... 21
Lithologic description............................................ 21
Gray sands................................................2 2
Clays ........................ ............................. 22Flint boulders...............................................Limestone inclusions......................................... 22
Conglomerate............................................... 22
Vertebrate and invertebrate fossils........................... 2-3
Phosphate rock ............................................. 23
Materials lying above the phosphate formation ....................... 24
Relation to the underlying formations-Vicksburg limestones ...
Local details ...................................................23?
Suwannee, County........................................... 25
Columbia County ........................................... 23
Alachua County ............................................ 26
Marion County .............................................,!
Citrus County.......... .................................... 29
Hernando County ...........................................219
Thickness ..................................................... 30
Source of materials ..................... ........................ 30
Conditions of deposition ......................................... 31
Formation name ................. .............................. 32
The Land Pebble Phosphate-Bone Valley formation.................... 33
Lithologic description ........................................... 33
Materials lying above the phosphate formation ............ .......... .34
Relation to the underlying formation-Arcadia marl?................. 35
Local details ................................................... 33
Hillsboro County .................... ....................... 33
Polk County................................................ 36
Condition of deposition ........................................ 37
Change of conditions during deposition .......................... ')
State and Government lands in the phosphate section...................... 38
List of phosphate companies operating in Florida during i90................. 39
Production of phosphate during 1909.............................. ............. 40
Table of production and shipment of Florida phosphate, 1908 09............41I