468 
ME.  A.  J.  JIJKES-BKOWXE  0]ST  SOME  EECENT  [Aug.  1 893, 
clay  proved  to  be  28  feet  thick ;  below  it  were  sands  with  small 
pebbles  of  chalk  and  flint  (29  feet  thick),  and  then  coarse  reddish 
sand  with  grains  of  oolitic  iron  down  to  63  feet.  There  can  be  no 
doubt  that  down  to  this  depth  the  materials  belong  to  the  Glacial 
series  ;  but  the  underlying  silty  clays  are  of  a  more  doubtful  nature  ; 
these  are  33  feet  thick,  and  are  described  as  firm,  silty  clays 
varying  in  colour  from  light  to  dark  brown.  A  specimen  sent 
me  from  between  the  depths  of  86  and  96  feet  is  a  brown  sandy 
clay  with  oolitic  grains  of  iron,  closely  resembling  some  of  the  ferru¬ 
ginous  marl  or  4  Roach 5  which  underlies  the  Carstone  at  the  southern 
end  of  the  Wolds.  As  all  this  mass  of  clay  seems  to  have  been 
perfectly  clean  and  free  from  stones,  I  regard  it  as  of  Lower 
Cretaceous  age,  and  would  place  the  base  of  the  Glacial  deposits  at 
63  feet.  The  materials  of  the  red  sand  found  between  57  and 
63  feet  appear  to  have  been  derived  from  the  destruction  of  Carstone 
and  4  Roach.’ 
At  96  feet,  red  sandstone  with  oolitic  grains  of  iron  was  found, 
and  continued  to  106  feet.  This  is  doubtless  the  equivalent  of 
the  ironstone-beds  seen  at  Skendleby  Lodge,  a  place  only  2  miles 
west  of  the  site  of  the  boring  ;  they  are  described  in  the  4  Geology 
of  East  Lincolnshire  ’ 1  as  44  brown  shaly  sandstone,  with  bands 
of  harder  dark-brown  oolitic  ironstone,”  5  or  6  feet  being  there 
exposed. 
At  106  feet,  the  bore  entered  a  stiff,  dark-grey  clay,  exactly  like 
the  Tealby  and  Donnington  clay  which  crops  out  below  the  4  Roach  ’ 
on  the  western  side  of  the  Wolds  near  Skendleby,  Dalby,  Langton,  etc. 
Clays  of  the  same  kind,  but  varying  in  colour,  and  some  containing 
selenite,  extended  down  to  214  feet.  Their  thickness  (108  feet)  is 
in  accordance  with  the  facts  published  in  the  Survey  Memoir ;  for 
it  is  there  stated  that  though  apparently  only  70  or  80  feet  thick 
near  Dalby,  borings  at  Skendleby  Salter  show  a  greater  thickness 
of  clay ;  and  in  the  Skegness  boring  on  the  coast  a  much  greater 
thickness  was  found. 
At  214  feet  red  (brown)  ferruginous  stone  occurred,  followed 
by  ferruginous  sandy  loams  with  oolitic  iron  grains  down  to  232 
feet.  These  beds  are  evidently  like  those  which  underlie  the  clay 
west  of  Spilsby,  and  are  described  in  the  Survey  Memoir  (p.  19)  as 
44  yellow  loams,  with  occasional  beds  of  oolitic  ironstone.” 
At  232  feet  the  bore  seems  to  have  entered  the  Spilsby  Sandstone. 
The  first  bed  (1  foot  thick)  is  described  by  Mr.  Staniland  as  a  semi¬ 
compact  sand  with  pieces  of  shell  and  Belemnite,  and  a  piece  of 
chalk ;  the  last  must  have  fallen  down  the  borehole,  but  the  shell 
and  Belemnite  may  belong  to  the  sand.  Below  came  6  inches  of 
compact  coarse-grained  sandstone,  and  then  light-coloured  earthy 
sandstone  10 1  feet  thick,  taking  the  bore  to  244  feet;  a  sample  of 
this  sent  to  me  was  a  firm,  light-grey,  calcareous  sandstone.  A 
harder  rock  was  found  below,  and  if  the  sample  preserved  is  to  be 
’Mem.  Geol.  Surv.  sh.  84  (1887),  p.  20. 
