GENERAL GEOLOGY.


Old Names.
Granite (general)............
Granite (specific)............
Granulite.
Gneiss (general) .............
Gneiss (specific).............


Mica schist (general).........
Mica schist (specific) .........
Hydromica schist (general)..
Sericite schist (specific)......
Protogine ...................
Greisen (general)............
Felsite ......................
Quartz-felsite (general).......
Kersantite (specific).........
Syenite (general)............
Syenite (specific)....
Quartz syenite (general).....
Quartz syenite (specific)......
Syenite gneiss...............
Diorite (general).............
Diorite (specific).............
Quartz diorite (general)......
Quartz diorite (specific)......
Andesite ....................
Gabbro......................
Dolerite or diabase (general). .
Dolerite or diabase (specific)..


Proposed Names.
Fel-qua-mi, qua-fel-mi, etc.
Ortho-qua-musc, qu'ortho-musc, etc.
Ortho-qua-bio, qu'ortho-bio, etc.
Fel-qua or qua-fel.
Foliated mi-qua-fel, fel-mi-qua, qua-mi-fel, etc.
Foliated musc-ortho-qua, ortho-mus-qua, qua-
musc-orth, etc.
Foliated bi-ortho-qua, Ortho-bio-qua, qua-bi-
orth, etc.
Schistose mi-fel-qua, mi-qua-fel, mi-qua, mi-fel,
etc., or mi-fel schist, mi-qua schist, or simply
mica schist.
Schistose musc-ortho-qua, bi-ortho-qua, etc.
Schistose  hydromi-qua-fel, hydromi-qua,     hy-
droini-fel, etc.
Sericite schist, schistose seri-qua, or seri-qua
schist.
Qu'orth-mi-chlor.
Granular qua-mi.
Felsit.
Felsi-qua.
Bi-olig.
Fel-amph, or amphi-fel.
Ortho-horn, or horn-orth.
Fel-amphi-qua, amphi-fel-qua, etc.
Ortho-horn-qua, horn-ortho-qua, etc.
Foliated ortho-horn, or horn-orth.
Plagi-amph or amphi-plag.
Labra-horn, oligo-horn, anortho-horn, etc.
Plagi-amphi-qua, amphi-plagi-qua, etc.
Labra-horn-qua, oligo-horn-qua, etc.
Ande-horn or andesite.
Labra-dial or dial-lab.
Plagi-pyr or pyro-plag.
Labrad-aug, olig-aug, anortli-aug, etc.


In pronunciation, the accent should be placed upon such syllables
as will best preserve the original sounds of the abbreviations, so far
as convenience of utterance will permit.
Since a gradual transition, advantageous at all stag-es, is to be pre-
ferred to a sudden revolution, it is suggested that the new terms may
be introduced in lithological discussions in parentheses after the com-
mon names. The new terms will thereby not only serve as defini-
tions of the old, as used, but as succinct statements of the composition
of the special rocks described, which is often but vaguely indicated
by the common names. This will often permit a shortening of de-
scriptions, and will certainly foster precision of observation and
statement, while (if a brief explanation of the system and a list of
abbreviations are given until they become well known) it will greatly
serve the convenience of students, semi-scientific readers, and not a
few geologists who mav not be specialists in lithology, and not
freshly familiar with its drifting terms. The system would thus
have opportunity to perfect itself while growing into general use.


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