FOR    THE    YEARS   1901-1905,   INCLUSIVE.  87 
Darton  (Nelson  Horatio) — Continued. 
18.  Preliminary  report  on  the  geology  and  underground  water  resources  of  the  central 
Great  Plains. 
U.  S.  Geol.  Surv.,  Professional  Paper  no.  32,  433  pp.,  72  pis.,  18  figs.,  1905. 
Describes  the  occurrence,  character,  and  relations  of  Archean,  Algonkian,  Cambrian,  Ordovi- 
cian,  Carboniferous,  Triassic,  Jurassic,  Cretaceous  strata  and  Tertiary  deposits,  the  geologic 
history  of  the  central  Great  Plains  region,  and  the  underground  waters  and  other  economic 
resources  of  the  area. 
19.  The  Zuni  salt  lake  [Arizona]. 
Jour.  Geol.,  vol.  13,  pp.  185-193,  5  figs.,  1905. 
Describes  the  situation  and  physiographic  features,  and  the  origin  and  history  of  the  lake. 
20.  The  coal  of  the  Black  Hills,  Wyoming. 
U.  S.  Geol.  Surv.,  Bull.  no.  260,  pp.  429-433,  1905. 
Describes  the  character,  occurrence,  and  geologic  relations  of  coal  beds,  and  the  mining 
operations. 
21.  Zuni  salt  deposits,  New  Mexico. 
U.  S.  Geol.  Surv.,  Bull.  no.  260,  pp.  565-566,  1905. 
Describes  the  occurrence  of  salt  deposits  in  west  central  New  Mexico. 
22.  Underground  waters  of  eastern  United  States:  Delaware. 
U.  S.  Geol.  Surv.,  Water-Supply  and  Irrigation  Paper  no.  114,  pp.  .11-113,  1905. 
Describes  briefly  the  general  geology,  the  water-bearing  horizons,  and  the  water  supplies. 
23.  Age  of  the  Monument  Creek  formation. 
Am.  Jour.  ScL,  4th  ser.,  vol.  20,  pp.  178-180,  1905. 
Gives  an  account  of  additional  evidence  for  the  Oligocene  age  of  the  Monument  Creek 
formation. 
24.  Discovery  of  the  Comanche  formation  in  southeastern  Colorado. 
Science,  new  ser.,  vol.  22,  p.  120,  1905. 
25.  Preliminary  list  of  deep  borings  in  the  United  States.     Second  edition,  with 
additions. 
U.  S.  Geol.  Surv.,  Water-Supply  and  Irrigation  Paper  no.  149,  175  pp.,  1905. 
26.  Sundance  folio,  Wyoming-South  Dakota. 
U.  S.  Geol.  Surv.,  Geol.  Atlas  of  U.  S.,  folio  no.  127,  1905. 
Describes  the  geography,  the  occurrence,  character,  and  relations  of  Algonkian,  Cambrian, 
Ordovician,  Carboniferous,  Triassic  (?),  Jurassic,  Cretaceous,  Tertiary,  and  Quaternary 
formations  and  of  igneous  rocks,  the  geologic  structure  and  history,  and  the  economic 
resources  of  the  area. 
27.  Structure  of  the  Great  Plains  and  the  mountains  on  their  western  margin. 
Abstract-  Science,  new  ser.,  vol.  21,  p.  917, 1905. 
Darton  (Nelson  H.)  and  Fuller  (Myron  L. ). 
1.  Underground  waters  of  eastern  United  States:  Maryland. 
U.  S.  Geol.  Surv.,  Water-Supply  and  Irrigation  Paper  no.  114,  pp.  114-123,  2  pis.,  1905. 
Describes  briefly  the  general  geology  and  water-bearing  horizons  of  the  State,  and  particu- 
larly those  of  the  Baltimore  district. 
2.  Underground  waters  of  eastern  United  States:  District  of  Columbia. 
U.  S.  Geol.  Surv.,  Water-Supply  and  Irrigation  Paper  no.  114,  pp.  124-126,  1  pi.,  1905. 
Describes  briefly  the  general  geology  and  the  water-bearing  horizons  and  prospects. 
3.  Underground  waters  of  eastern  United  States:  Virginia. 
U.  S.  Geol.  Surv.,  Water-Supply  and  Irrigation  Paper  no.  114,  pp.  127-135,  1  pi.,  1905. 
Describes  the  general  geology  and  the  water  horizons. 
Darton  (Nelson  H.)  and  Keith  (Arthur). 
1.  Washington  folio,  District  of  Columbia-Maryland-Virginia. 
U.  S.  Geol.  Surv.,  Geol.  Atlas  of  U.  S.,  folio  no.  70,  1901. 
Describes  geographic  and  topographic  features,  the  character  and  occurrence  of  Archean 
rocks  and  of  the  Cretaceous,  Eocene,  Neocene,  and  Pleistocene  stratasthe  general  structure 
of  the  Piedmont  and  Coastal  plain  regions,  and  mineral  resources  of  the  area. 
