244 
Tkc American Geoloo-jst. 
April, 1904. 
TABLE II.— A TABLE OF THE 
||Texture. 1 RUDACEOUS. 
Composition 
Unconsolidated. 
Consolidated, 
(rudytes.) 
Metamorphic. 
I'nconsolidated 
'YRO- 
CLASTIC 
Chiefly 
complex 
silicates. 
Volcanic blocks, 
bombs, or lapilli. 
Volcanic Breccia 
and Agglomerates 
etc. 
(Pyrorudytes.) 
Meta-breccia 
Meta-agglom- 
erate. 
Volcanic sand. 
lUTO- 
CLASTIC 
Varied 
according to 
composition 
of original 
rock mass. 
Sometimes 
purely 
siliceous or 
calcareous. 
Fault rubble 
Boulder clay 
Boulder moraine 
Fault breccia. 
Coarse, unstiatified 
pudding stones. 
(Autoiudyles.) 
Meta-breccia. 
Meta-pudding- 
stone. 
Autoclastic sand 
T'nassorted glacial 
sand. 
lTMO- 
CLASTIC 
Generally 
complex 
except when 
original rock- 
maFS is 
simple. 
1 
Talus rubble; 
generally com- 
plex silicates, 
but sometimes 
pure silica or 
or lime. 
Breccia. 
(Complex atmoru- 
dytcs, sometimes 
atmosilicirudytes or 
atmocalciiudytes. 
Meta-breccia 
Quartzytes. 
Marbles. 
Disintegration 
sands (gi-anitic) 
sometimes pure 
siliceous or calcare- 
ous sands. 
1 .Siliceous 
2 Calcareous 
3 Argil'ace- 
ous (usually 
1 Wind blown 
quartz sand. 
2 Wind blown lime 
sand. 
.NEMO- 
CLASTIC 
quite pure). 
A. Simple. 
1. Siliceous. 
a. pure. 
b. impure. 
a. Quartz peb- 
b'es. 
b. Miscellaneous 
gravel, quartz 
piedomJnant. 
a. Quartz conglom- 
erate (Hydrosilici- 
rudytes.) 
b. Composite ru- 
dytes with pebbles 
of crystalline or of 
mixed rock, with 
the quartz. 
(Impvne Hydrosili- 
cirudytes.) 
Meta conglom- 
erate. 
a. Quartz sand, 
beach, river or gla- 
cial wash sand. 
b. Micaceous, feld- 
spathic, glauconitic. 
etc. quartz sands. 
c. Glauconite sands. 
lYDRO- 
CLASTIC 
2. Calcareous 
a. pure. 
b. impure. 
a. Calc lubble 
of corals, shells, 
etc. or of older 
limestones. 
b. Calc lubble 
with siliceous 
or crystalline 
fragments, or 
siliceous or ar- 
gillaceous paste. 
a. Pure lime con- 
glomerate or calci- 
ludiies. 
(Hydrocalcirudytes) 
h. Siliceous, argilla- 
ceous or complex 
calcirudytes. 
(ImpureHydrocalci- 
rudytes.) 
a Marble. 
b. Impiu-e mar- 
ble. 
a. Calc sand. 
b. Silicious. argila- 
ceous ferruginous 
calc sand. 
3. Argillace- 
ous, 
a. pure. 
l3. impiu'e. 
Local 
Local 
Exainples. 
Examples. 
* 
B. Complex. 
Crystalline 
gravel. 
Complex conglom- 
erate. (Complex 
Hydrorudytes.) 
Meta-congloni- 
erate. 
Silicate sands. 
5IO- 
CLASTIC 
Complex 
or simple. 
(Siliceous, 
calcareous, 
argillaceous, 
■carbonaceous 
etc.) 
Rubble of brok- 
en or crushed 
stones of varying 
type. 
Concretes 
etc. 
(Biorudytes) 
Ground up rock. 
