364  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1905. 
Drillt  rs;  terms  for  oil  and  <jas  rocks,  etc.,  and  their  geologic  correlations — Continued. 
Geologic 
formal  ion. 
Name  applied  by 
drillers. 
Geologic  name. 
Ap- 
proxi- 
mate 
maxi- 
nnnn- 
thick- 
ness. 
Approximate 
minimum  and 
maximum  inter- 
vals to  top  of 
bed  from  Pitts- 
burg coal. 
Correlation  with 
sands  in  neighbor- 
Allegheny 
Upper     Freeport 
rmellsA  tile) 
coal. 
Gas  sand 
Upper     Freeport 
coal. 
Freeport,        Kit- 
tanning  or  Clar- 
ion sandstone. 
Pottsville     sand- 
stones. 
Feet. 
(?)5 
150 
(?)200 
Feet. 
570-670 
650-850 
850-950 
Unconformity. 
Mauch  Chunk.. 
Red  rock  or  shale. 
Little    Li (or 
Salval  ion  sand  i. 
Pencil  Cave 
Big  Lime... 
Mauch        Chunk 
shale. 
[Greenbrier    lime- 
|     stone. 
BurgOOD        sand- 
stone. 
150 
100 
..mi 
inn 
20 
40 
60 
40 
20 
40 
100 
40 
40 
12 
10 
-     960-1,060 
960  1.  160 
-1,070  1,300 
l,7!)ii   L,900 
-1,800  1,980 
-1,850-1,950 
1,900-2,030 
2,000  2,120 
2,000-2,140 
2,  100-2,250 
2,080-2,290 
-2,150-2,320 
-2,220-2,350 
-2,350-2,480 
-2,400-2,550 
Salvation      sand= 
Maxton  sand. 
Mountain          sand- 
stone. 
Berea     or     Butlea 
County  gas  sand. 
I  Hundred-font   sand 
(     or  First  sand. 
Big  Injun  sand . . . 
Thirty-fool  sand  . 
Pocono 
[led  shale 
Gantz  sand 
Bedford  1  ?   shale. 
Fifl  y-foo1  sa  nd. 
'Nineveh,   or    Ni- 
neveh     30-foot 
sand. 
Red  rock 
Catskill  beds 
Mistaken    for    Cor- 
don in  this  area,. 
Chemung 
Gordon 
sand. 
Gordon  sand 
i  ourth  sand 
Third   sand,   some- 
times   mistaken 
for  Fourth  sand. 
Fifl  h  sand 
McDonald  sand. 
Bayard  sand 
Elizabeth  sand . . . 

Sixth  sand. 
In  studying  the  wells  with  a  view  to  tracing  the  sands,  a  line  of  wells  was  taken,  begir> 
ning  at  the  original  Gantz  well,  near  the  Gordon  well  in  Washington,  and  extending  south- 
ward to  the  Fonner  field  and  t  ben<  e  to  all  parts  of  western  Greene  County.  In  this  tracing 
the  Gordon  sand  was  found  to  maintain  its  interval  of  ISO  to  200  feel  below  the  top  of 
the  Fifty-fool  -and  and  to  lie  below  the  sand  hitherto  called  "Gordon"  in  the  Nineveh  oil 
field.  In  the  Gantz  well  the  Nineveh  sand  is  not  recorded,  but  in  the  Baker  well  near 
Lone  Pine,  midway  between  Washington  and  the  Greene  County  line,  the  sand  occurs 
L02  feel  below  the  top  of  the  Fifty-foot  sand.  In  that  region  and  very  frequently  through- 
out eastern  Washington  County  the  name  Gordon  Stray  has  been  applied  to  the  sand  at 
this  horizon.  In  the  Baker  well  the  sand  attains  an  unusual  thickness.  South  of  this 
well  the  next  good  section  in  line  is  that  of  the  Fonner  Xo.  2.  Tn  this  well  the  1  ineveh 
sand  consists  of  13 feet  of  red  sand  lying  -18  feet  below  the  top  of  the  Fifty-foot;  asecond 
red  rock  occurs  68  feet  below  it  and  a  few  feet  above  the  Gordon  sand.  The  John 
Lewi-  well,  2.2  miles  north  of  Nineveh,  offers  the  next  complete  record,  and  this  is  the 
farthest  well  northeast  in  which  the  mistake  in  correlation  is  known  to  have  been  made. 
The  term  Gordon  has  been  used  by  the  drillers  to  designate  the  Nineveh  sand.  From  the 
Lewis  well  this  sand  can  be  traced  almost  continuously  the  entire  length  of  the  oil  district, 
being  known  to  the  drillers  in  this  county  either  as  "Gordon"  or  "Gordon  Stray." 
