792  INDEX    TO    PUBLICATIONS    OF    IT.    S.    GEOL.    SUKVEY.     [bull.  177. 
Trap  rock,  analysis  of,  from  Pennsylvania,  Berks  County Ann  19, 
vi  cont,  p  222;  Ann  20,  vi  cont,  p  435 
as  data  for  correlation  of  Newark  areas Bull  85,  pp  30-31 
decay  of Bull  52,  pp  16-18 
geographic  distribution  of,  in  eastern  United  States Bull  85,  pp  70-72 
in  Connecticut  Valley,  Triassic  series Ann  7,  pp  462-468 
in  New  Jersey  region,  Newark  system,  relations  of Bull  67 
of  Newark  system Bull  85,  pp  66-77 
thin  section  of,  from  Massachusetts,  Greenfield  (red  hematitic) Mon  xxix, 
pp  430-431 
(See,  also,  Basalt.) 
Trap  sheets,  origin  of,  conclusion  as  to Ann  18,  n,  pp  76-77 
Traverse  series  (Hamilton )  in  Michigan WS  30,  pp  86-87 
Travertine,  analysis  of,  from  Arkansas,  Arkansas  hot  springs Ann  9,  p  646 
analysis  of,  from  Asia  Minor,  Hierapolis Ann  9,  p  646 
from  Yellowstone  Park Ann  9,  p  646;  Bull  150,  p  101 ;  Bull  168,  p  268 
formation  of,  by  hot  springs Ann  9,  pp  613-676 
from  Yellowstone  Park,  description  of,  as  one  of  the  educational  series.  .Bull  150, 
pp  99-101 
(See,  also,  Tufa.) 
Travis  Peak  formation  in  Texas Ann  18,  n,  pp  219-221;  Ann  21,  vn,  pp  140-144 
Trees  as  agents  of  soil  formation Ann  12,  i,  pp  269-274 
(See  Forests.) 
Trees  and  chaparral  in  San  Gabriel,  San  Bernardino,  and  San  Jacinto  forest 
reserves Ann  20,  v,  pp  418-426,  437-451,  463-476 
Trees  and  shrubs  in  Colorado  forest  reserves Ann  20, 
v,  pp  46-63, 109-115,  123-133, 195-209 
in  Flathead  and  Bitterroot  forest  reserves Ann  20, 
v,  pp  247-250,  255-314  (passim),  329-357,  392-405 
Tremolite,  analysis  of.  from  Pennsylvania,  Easton Bull  64,  p  44 
chemical  constitution  of Bull  125,  p  90 
thin  section,  showing  alteration  of  hypersthene  into  fibrous  green  horn- 
blende and Bull  59,  p  23 
Trenton  limestone  in  Canada Bull  81,  p  334 
in  Illinois,  thickness,  etc.,  of Ann  17,  n,  pp  836-837 
in  Indiana Ann  11 ,  i,  pp  627-629 
as  a  source  of  gas  and  oil Ann  8,  n,  pp  475-662;  MR  1892,  pp  690-695 
topography  of A  nn  1 1 ,  i,  pp  648-651 
in  Michigan WS  30,  p  90 
in  New  York-Vermont Ann  19,  in,  p  190 
in  Ohio  as  a  source  of  gas  and  oil Ann  8,  n,  pp  475-662;  MR  1892,  pp  687-690 
as  a  water  carrier Ann  19,  iv,  pp  639-641,  651-654 
thin  sections  of,  from  Indiana Ann  8,  n,  pp  644-645 
Trenton  limestone  and  shale  of  Iowa Ann  11,  i,  pp  329-330 
Tres  Piedras  Mesa,  Rio  Grande  Basin,  irrigation  on Ann  12,  ir,  p  256 
Tri-  and  tetraphosphonitrilic  chlorides Bull  167,  pp  77-89 
Triangulation,  primary,  executed  by  Survey  between  1882  and  1894 Ann  16, 
i,  pp  875-885 
in  1894-1900,  results  of,  in  various  States Ann  16,  i,  pp  62-63;  Ann  17,  i,  pp 
94-96;  Ann  18,  i,  pp  96-97,  143-225;  Ann  19,  i,pp  153-191; 
Ann  20,  i,  pp  221-291;   Ann  21,  i,  pp  227-375;    Bull   122 
in  survey  of  Idaho-Montana  boundary  line Bull  170,  pp  29-40 
in  topographic  work,  method  of Mon  xxn,  pp  41-75 
Triangulation  and  spirit  leveling  in  Indian  Territory Bull  175 
