8 CONTENTS. 
New Jersey — Continued. p a; 
Portland-cement materials — Continued. 
Limestones of Warren and Sussex counties — Continued. 
Kittatinny or " Magnesian " limestone 
Trenton limestone 
Hudson shales 
Geologic structure 
Limestones of Upper Delaware Valley 
White marl deposits 
Portland-cement industry 
Bibliography 
N ew York 
Portland-cement materials 
Chazy limestone 
Trenton limestone 
Helderberg limestones '. 
Tully limestone 
Quaternary marls 
Portland-cement industry 
Early history 
Present condition 
North Carolina 
Crystalline limestones ! 
Soft limestones J i 
North Dakota 
Ohio 
Portland-cement materials 
Trenton series 
Cincinnati group 
Clinton limestones 
Corniferous limestones 1 
Maxville limestones 2 
Coal measures limestones '3 
Quaternary marls ? 3 
Portland-cement industry : 3 
Oklahoma ^5 
Oregon i" 
Materials and conditions in southwestern Oregon 
Materials in northeastern ( )regon 
Pennsylvania 
Portland-cement materials 
Trenton limestone 
Helderberg or Lewistown limestone 180 
Carboniferous limestones 82 
Portland-cement industry R4 
Lehigh district 184 
Geology 
Magnesian Kittatinny limestone 
Trenton limestone 
Hudson shales 
Manufacturing methods 88 
Combination of materials used 
Character and composition of the cement rock 
