VAN 
.1  EASTERN    CTNITED    STATES.  437 
Kiver,  with  a  section   illustrating  the  superposition  of  the  rocks,  Dr.  William  E.  A. 
Aikin.     Am.  Jour.  Sci.,  1st  ser.,  vol.  XXVI,  1834,  pp.  219-232. 
166  Annual  Report  of  the  Geologist  of  Maryland,  J.  T.  Ducatel ;  pp.  33. 
167  First  Report  of  the  State  Agricultural  Chemist  of  Maryland,  Philip  T.  Tyson. 
Annapolis,  1860,  pp.  145  and  20;  map. 
1158 The  Gabbros  and  Associated  Hornblende  Rocks  occurring  in  the  Neighborhood 
of  Baltimore,  Maryland,  George  H.  Williams.  Bull.  U.  S.  Geol.  Survey,  No.  28,  pp.  78 ; 
4  pis. 
im The  Petrography  and  Structure  of  the  Piedmont  Plateau  in  Maryland,  George 
Huntington  Williams ;  with  a  Supplement  on  a  Geological  Section  across  the  Pied- 
mont Plateau  in  Maryland,  by  Charles  R.  Keyes.  Bull.  Geol.  Soc.  of  America,  vol.  n, 
pp.  301-322. 
170 Memoir  on  the  Geological  Survey  of  the  State  of  Delaware,  including  the  Appli- 
cation of  the  Geological  Observations  to  Agriculture,  James  C.  Booth.  Dover,  1841, 
pp.  188. 
171  Preliminary  Notes  on  the  Geology  of  Delaware — Lauren  tian,  Paleozoic,  and  Cre- 
taceous areas,  Frederick  D.  Chester.  Proc.  Philadelphia  Acad.  Sci.,  1884,  pp.  237-259, 
with  a  map. 
17-The  Gabbros  and  Associated  Rocks  in  Delaware,  Frederick  D.  Chester.  Bull.  U. 
S.  Geol.  Survey,  No.  59,  pp.  45. 
173 Remarks  on  the  "Tide  Water"  Gneisses  of  the  Atlantic  Coast  Region,  D.  S. 
Martin.     Trans.  N.  Y.  Acad.  Sci.,  vol.  v,  pp.  19-20. 
174 On  the  Geology,  Mineralogy,  Scenery,  and  Curiosities  of  Parts  of  Virginia,  Ten- 
nessee, and  the  Alabama  and  Mississippi  Territories,  etc.,  with  Miscellaneous  Re- 
marks, Rev.  Elias  Cornelius.    Am.  Jour.  Sci.,  1st  ser.,  vol.  I,  pp.  214-226,  317-331. 
175  Report  of  the  Progress  of  the  Geological  Survey  of  the  State  of  Virginia  for  the 
year  1839,  William  B.  Rogers.  Richmond,  1840,  pp.  161.  See  also  Preliminary  Report 
(Virginia)  for  1835  and  Annual  Reports  for  1836, 1837, 1838. 
17r>  Report  of  the  Progress  of  the  Geological  Survey  of  Virginia  for  the  year  1840, 
William  B.  Rogers.     Richmond,  1841,  pp.  132. 
177 On  some  Points  in  the  Geology  of  the  Blue  Ridge  in  Virginia,  William  M.  Fon- 
taine.    Am.  Jour.  Sci.,  3d  ser.,  vol.  ix,  pp.  14-22,  93-101. 
1780n  the  Primordial  Strata  of  Virginia,  William  M.  Fontaine.  Ibid.,  vol.  ix,  pp. 
361-369, 416-428. 
179 Geology  of  Virginia — Balcony  Falls;  the  Blue  Ridge  and  its  Geological  Con- 
nections; some  Theoretical  Considerations,  J.  L.  Campbell.  Ibid.,  vol.  xviii,  pp. 
435-445.  See  also  the  Silurian  P"ormation  in  Central  Virginia.  The  "Virginias,  vol.  1, 
pp.  41-45,  54-56;  and  Am.  Jour.  Sci.,  3d  ser.,  vol.  xviii,  pp.  16-29. 
180  The  mineral  resources  and  advantages  of  the  country  adjacent  to  the  James 
River  and  Kanawha  Canal  aud  the  Buchanan  and  Clifton  Forge  Railway,  J.  L.  Camp- 
bell.    The  Virginias,  vol.  I,  pp.  2-8,  with  map. 
181  The  geology  of  the  Blue  Ridge,  etc.,  at  James  River  Gap,  Virginia,  J.  L.  Camp- 
bell.    Ibid.,  pp.  86-87,  94. 
182  Notes  on  the  Mineral  Deposits  at  certain  Localities  on  the  Western  Part  of  the 
Blue  Ridge,  Wm.  M.  Fontaine.     Ibid.,  vol.  IV,  pp.  21-22,  42-47,  55-59,  73-76,  92-93. 
183  A  Reprint  of  Annual  Reports  and  Other  Papers  on  the  Geology  of  the  Vir- 
ginias, William  Barton  Rogers,  pp.  832.     Accompanied  by  maps  and  sections. 
184  The  Snowdon  Slate  Quarries,  J.  L.  and  H.  D.  Campbell.  The  Virginias,  vol.  v, 
pp.  162-163,  170.  See  also  Geology  of  the  Blue  Ridge  in  James  River  Gap,  Virginia, 
J.L.Campbell.  Ibid.,  p.  145;  Geology  of  the  Blue  Ridge  near  Balcony  Falls,  Vir- 
ginia; a  modified  view,  John  L.  Campbell.  Am.  Jour.  Sci.,  3d.  ser.,  vol.  xxviii,  pp. 
221-223;  vol.xvm,  pp,  435-445. 
185  The  Structure  of  the  Blue  Ridge  near  Harper's  Ferry,  H.  R.  Geiger  and  Arthur 
Keith.     Bull.  Geol.  Soc.  of  America,  vol.  n,  pp.  155-164. 
