GENERAL   ACCOUNT    OF   THE    PRE-CAMBRLAN    ROCKS.  43 
Table  of  correlation  of  pre- Cambrian  rocks  of  North  America — Continued. 
Adirondack^. 
Unclassified: 
Grenville.  Limestones  with 
associated  conglomerates 
and  gneisses  of  sedimentary 
origin,  with  gneisses  of 
unknown  origin,  and  with 
granites,  gneisses,  and 
greenstones  of  igneous  ori- 
gin, partly  intrusive  into 
the  sediments  and  largely 
with  unknown  relations. 
Correlated  with  Grenville 
series  of  original  Lauren- 
tian  and  Hastings  districts, 
and  perhaps  also  with  up- 
per series  of  Hastings  dis- 
trict. Succession  is  still 
too  doubtful  to  warrant 
correlation  of  the  series  as  a 
whole  with  Algonkian  and 
Archean. 
Eastern  Townships. 
New  Brunswick. 
Unclassified  pre-Cambrian  (?): 
Volcanic  rocks,  associated 
with  sediments  of  possible 
pre-Cambrian  age,  of  Sut- 
ton, Stokes,  and  Lake  Me- 
gantic  areas. 
Algonkian  (?): 
Kingston  group. 
"Huron  i  a  n'' 
slates,  schists, 
and  diorites. 
Unclassified: 
Grenville.  Lime- 
stone, quartz- 
i  t  e  s,    and 
gneisses. 
L  aur  e  ntian. 
Gneisses    and 
schists,  partly 
intrusive   into 
the     Grenville 
series. 
Undivided   sediments 
tral  New  Brunswick 
Southern 
New 
Brunswick. 
Nova  Scotia  and  Cape  Breton. 
Algonkian: 
Gold-bearing  series  in  south- 
eastern Nova  Scotia.  Cor- 
respond in  stratigraphic 
position  supposedly  with 
Avalon,  Ocoee,  and  other 
late  Algonkian  rocks  o  f 
eastern  America. 
Undivided  sediments  cut  by 
intrusives. 
Unclassified: 
Granites  and  gneisses,  largely 
intrusive  into  sedimentary 
series  (mapped  Lauren- 
tian). 
Newfoundland. 
Gaspe  Peninsula. 
Algonkian: 
Avalon  group.  Sediments 
intruded  by  granite  and 
associated  with  volcanic 
conglomerates  and  ashes. 
Unclassified: 
Granites,  gneisses,  and 
schists  of  doubtful  rela- 
tions to  Avalon  group 
(mapped  Laurentian). 
Unclassified  pre-Cambrian: 
Gneisses,  schists,  and  sedi- 
ments of  Shickshock  Moun- 
tains. 
New  England. 
Southeastern  New  York. 
Highlands  of  New  Jersey. 
Unclassified  pre-Cambrian: 
Some    of    the    discriminated 
units  are— 
Mendon     schist     of     Ver- 
mont (?). 
Mount  Holly  group  of  Ver- 
mont (?). 
Northbridge      gneiss       of 
Rhode  Island. 
Stamford 
gneiss. 
B  e  c  k  e  t 
gneiss. 
Washington  I  Southwestern 
gneiss.        [New  England. 
Colesbr  ook 
limestone. 
Hinsdale 
gneiss. 
Algonkian  (?): 
"Inwood"  limestone  and 
"Manhattan"  schist  (?), 
according  to  Berkey.  re- 
garded as  Paleozoic  by 
Merrill  and  Eckel. 
— Unconformity. 
Unclassified: 
Kordham  gneiss,  continuous 
with  gneisses  and  sedi- 
ments of  the  New  York 
Highlands,  with  gneisses 
of  New  Jersey,  and  with 
the  Becket  gneiss  of  New 
England.  Probably  the 
equivalent  of  the  G  renville 
series. 
Unclassified  pre-Cambrian: 
White  limestones  and 
gneisses,  largely  igneous 
and  intrusive,  partly  of  un- 
known age  and  relations. 
Probably  equivalent,  in 
part  at  least,  of  Grenville 
series. 
