Page images
PDF
EPUB

PREFACE.

WANT expressed by many Geologists and often felt by the Author, is a classified HANDY-BOOK OF ROCK NAMES. It is hoped that, until a better appears, this Manual may be useful to the Public.

To write such a work satisfactorily is no easy task. In other branches of Natural Science, such as Botany, Zoology, and the like, some systematic nomenclature has been followed, but in Geology no one system has been used, or all system has been ignored. It is not uncommon to find eminent Petrologists calling the rock by several names, or, what is more perplexing, using for a rock a name already given to a totally different one. At the present time

Rock names

same

are in such confusion that if an observer names a rock, without at the same time mentioning his authority, he may be supposed to be referring to a rock, or even rocks, totally different to that which he intended to illustrate. This irregularity has caused many names to be used, not only unscientifically but also absurdly, as the original name may refer to a mineral or character not possessed by the rock or rocks to which it is now applied. From the above it is evident that a compiler of such a book as this Manual must run contrary to the opinions and

[ocr errors][merged small]

Damng the camlade is Manual, the sts have been con

sulted and acce cooted: also also works in general subjects from which information could be procured. Dana's suggestions as to the termination of Rock names have been adopted as far as practicable, while the older names for rocks are generally adopted, except when they are objectionable or better names have since been proposed. Such local names as were known are also given, as they may assist explorers in gleaning information about a country. To various fellow-labourers I am much indebted to D. Forbes, F.R.S., &c., for information; also to W. King, Dep. Supt. Geol. Surv., India, and for his valuable assistance while arranging and classifying the rocks. I should also mention the names of the Rev. M. H. Close, M.R.I.A., &c.; Stackpoole Westropp, M.D., M.R.I.A., &c.; and H. Leonard, M.R.Í.Ä.; besides others who have supplied me with lists of local names.

G. H. K.

Group N. Slate

Group O. Calcareous Rocks

Group P. Pseudomorph Calcareous Rocks

PART III.-Order II. DERIVATE ROCKS ...
Class 1. Subaqueous Rocks

...

...

Page 88

89

...

[blocks in formation]

Group A. Rocks for the most part mechanically

[merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small]

Group B. Rocks for the most part chemically formed 106

[blocks in formation]

110

110

Subgroup F. Limonite Rock

Subgroup G. Hematite Rock

Subgroup H. Spherosiderite

Subgroup 1. Minerals occurring as Rock Masses 111
Group C. Rocks partly mechanically, partly chemi-
cally, and partly organically formed
Subgroup A. Laminated Coal

Subgroup B. Limestone

Subgroup C. Dolomyte

Class 2. Subaërial Rocks

[blocks in formation]

...

...

112

...

...

112

[blocks in formation]

Group D. Mechanically, chemically, and organically

formed

...

Subgroup A. Coal

115
120

122

122

122

Subgroup B. Surface Deposit and Accumulations 126

« PreviousContinue »