482  PRE-CAMBRIAN    GEOLOGY    OF    NORTH    AMERICA. 
20  Progress  report  of  exploration  and  survey  of  Leeds,  Frontenac,  and  Lanark 
counties,  by  Henry  G.  Vennor.  Kept.  Prog.  Geol.  Survey  Canada,  1871-72,  pp. 
320-140. 
21  On  explorations  and  surveys  in  the  counties  of  Frontenac,  Leeds,  and  La- 
nark, by  Henry  G.  Vennor.  Kept.  Prog.  Geol.  Survey  Canada,  1872-73,  pp. 
136-179. 
22  Report  of  explorations  and  surveys  in  Frontenac,  Leeds,  and  Lanark  coun- 
ties, by  Henry  G.  Vennor.  Kept.  Prog.  Geol.  Survey  Canada,  1873-74,  pp. 
103-146. 
23  Progress  report  of  explorations  and  surveys  in  the  rear  portions  of  Fronte- 
nac and  Lanark  counties,  by  Henry  G.  Vennor.  Rept.  Prog.  Geol.  Survey 
Canada,  1874-75,  pp.  105-165,  with  a  map.  See  also  Rept.  Prog.  Geol.  Survey 
Canada,   1875  76.  p.  4. 
24Arcbean  of  Canada,  by  Henry  G.  Vennor.  Am.  Jour.  Sci.,  3d  ser.,  vol.  14, 
1877,  pp.  313-316. 
25  Progress  report  of  explorations  and  surveys  made  during  the  years  1875 
and  1876  in  tbe  counties  of  Renfrew,  Pontiac,  and  Ottawa,  by  Henry  G.  Vennor. 
Rept.  Prog.  Geol.  Survey  Canada,  1876-77,  pp.  244-320,  with  a  map. 
26  Notes  upon  the  occurrence  of  Eozoic  rocks  in  the  South  Riding  of  Hastings 
County,  and  in  Prince  Edward  County,  Ontario,  by  D.  F.  H.  Wilkins.  Canadian 
Naturalist,  2d  ser.,  vol.  8,  1878,  pp.  278-282. 
27  Report  of  observations  on  the  stratigraphy  of  the  Quebec  group  and  the 
older  crystalline  rocks  of  Canada,  by  A.  R.  C.  Selwyn.  Rept.  Prog.  Geol.  Sur- 
vey Canada,  1877-78,  pp.  1-15a.  See  also  Summary  report  of  the  operations 
of  the  Geological  Corps  to  December,  1880.  Rept.  Prog.  Geol.  and  Nat.  Hist. 
Survey  Canada,  1879-80,  pp.  1-9. 
28  Descriptive  sketch  of  the  physical  geography  and  geology  of  the  Dominion 
of  Canada,  by  A.  R.  C.  Selwyn  and  G.  M.  Dawson,  1884,  pp.  55. 
29  Account  of  explorations  in  the  Eastern  Townships  of  Quebec,  by  F.  D. 
Adams.  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey  Canada,  1887-88,  new  ser., 
vol.  3,  pt.  1,  pp.  27a,  28a,  84a,  85a. 
30  Report  on  the  geology  and  economic  minerals  of  the  southern  portion  of 
Portneuf,  Quebec,  and  Montmorency  counties.  Province  of  Quebec,  by  A.  P. 
Low.     Ann.  Rept.  Geol.  Survey  Canada,  1890-91,  vol.  5,  pt.  1  l,  1892,  pp.  5-82. 
31 A  group  of  diabase  dikes  among  the  Thousand  Islands,  St.  Lawrence  River, 
by  C.  H.  Smyth.     Trans.  New  York  Acad.  Sci.,  vol.  23,  1893-94,  pp.  209-214. 
32  Norian  Oder  Ober-Laurentian  von  Canada,  by  F.  D.  Adams ;  Inaugural- 
Dissertation  zur  Erlangung  der  Doctorwurde  der  Universitat  zu  Heidelberg, 
1893.  Neues  Jahrb.,  Beil.  Band  8,  1893,  pp.  419-498.  Published  also  in  Ca- 
nadian Rec.  Sci.,  vol.  6,  1895,  pp.  169-198,  277-305,  416-443. 
33  The  Laurentian  of  the  Ottawa  district,  by  R.  W.  Ells.  Bull.  Geol.  Soc. 
America,  vol.  4,  1893,  pp.  349-360. 
34  On  the  typical  Laurentian  areas  of  Canada,  by  Frank  D.  Adams.  Jour. 
Geology,  vol.  1,  No.  4,  1893,  pp.  325-340. 
35  Preliminary  report  on  the  geology  of  a  portion  of  central  Ontario  situated 
in  the  counties  of  Victoria,  Peterborough,  and  Hastings,  together  with  the  re- 
sults of  an  examination  of  certain  ore  deposits  occurring  in  that  region,  by 
F.  D.  Adams.    Ann.  Rept.  Geol.  Survey  Canada,  pt.  1,  vol.  6,  1894,  pp.  15. 
36  Mica  deposits  in  the  Laurentian  of  the  Ottawa  district,  by  R.  W.  Ells. 
Bull.  Geol.  Soc.  America,  vol.  5,  1894,  pp.  481-488. 
.  37A  further  contribution  to  our  knowledge  of  the  Laurentian    (art.  7),  by 
F.  D.  Adams.    Am.  Jour.  Sci.  3d  ser.,  vol.  50,  1895,  pp.  58-69,  Pis.  I,  II. 
38  The  physical  features  and  geology  of  the  route  of  the  proposed  Ottawa 
Canal  between  the  St.  Lawrence  River  and  Lake  Huron,  by  R.  W.  Ells  and  A,  E. 
