...this gneissic series, and are intimately associated with beds of iron ore, generally a slaty hematite, but occasionally magnetite. Chrome, titanium. nickel,...character, which has acquired for them the name of tulcose or nacreous slates, though analysis shows them not to be magnesia n. but to consist essentially...

...thus gneUbic series, and are intimately associated with beds of iron ore, generally a slaty hematite, but occasionally magnetite. Chrome, titanium, nickel,...frequently met with in this series. The gneisses often pas; into schistose micaceous quartzites, and the argilliies, which abound, frequently assume a soft,...

...this gueissie series, and are intimately associated with beds of iron ore, generally a slaty hematite, but occasionally magnetite. Chrome, titanium, nickel,...series. The gneisses often pass into schistose micaceous qnartzites. and the argillites, which abound, frequently assume a soft, unctuous character, which has...

...Printed in advance from the Association number of the American Naturalist. 8vo. Salem, 1871. tains of Vermont ; and (3), The White Mountains of New Hampshire....slates, though analysis shows them not to be magnesian, bnt to consist essentially of a hydrous micaceous mineral. They are sometimes black and graphitic....

...this gneissic series, and are intimately associated with beds of iron ore, generally a slaty hematite, but occasionally magnetite. Chrome, titanium, nickel,...nacreous slates, though analysis shows them not to be magnesiau, but to consist essentially of a hydrous micaceous mineral. They are sometimes black and...

...this gneissic series, and are intimately associated with beds of iron ore, generally a slaty hematite, but occasionally magnetite. Chrome, titanium, nickel,...which has acquired for them the name of talcose or » Ainer. Jour. Sci., II., v. 116. nacreous slates, though analysis shows them not to be magnesian,...

...this gneissic series, and are intimately associated with beds of iron ore, generally a slaty hematite, but occasionally magnetite. Chrome, titanium, nickel,...which has acquired for them the name of talcose or 6 ADDRESS OF EX-PRESIDENT HUNT. nacreous slates, though analysis shows them not to be magnesian, but...

...this gneisbic series, and are intimately associated with beds of iron ore, generally a slaty hematite, but occasionally magnetite. Chrome, titanium, nickel,...frequently met with in this series. The gneisses often pas* into schistose micaceous qu^rtzite?, and the argillites, which abound, frequently assume a soft,...

...this gneissic series, and are intimately associated with beds of iron ore, generally a slaty hematite, but occasionally magnetite. Chrome, titanium, nickel,...antimony, and gold are frequently met with in this scries. The gneisses often pass into schistose micaceous quartzites, and the argillites, which abound,...

...this gneissic series, and are intimately associated with beds of ironore, generally a slaty .hematite, but occasionally magnetite. Chrome, titanium, nickel,...consist essentially of a hydrous micaceous mineral allied to paragonite. They are sometimes black and graphitic. III. The White Mountain Series. — This...