216 
LOWER OOLITIC ROCKS OF ENGLAND: 
r 
Hibaldstow 
Beds. 
FT. 
7 
IN. 

6 

5. Thin beds of pale-buff oolite 
Blue-hearted earthy oolitic lime- 
stone - - - 1 
4. Marly bed - - 4 
f3. Shelly limestones, with Ostrea 
and other Lamellibranchs - 5 ' 
2. Grey and yellow limestones, and 
Kirton Beds. ^ dark shales, resembling beds of 
Lower Lias : the bottom layer 
containing clusters of dark 
[_ oolitic and other grains 7 to 8 
1. Compact buff limestone with 
scattered oolite grains ; bed 
with Pinna at the top, other 
beds shelly in places, some 
coarse grained : on the whole 
resembling the Silver-bed of 
Lincoln. 
Fine freestone with coarser oolitic 
grains (as at the Dean and Chapter 
pit, Lincoln), seen in deep road- 
cutting to north. 
A quarry east of Washingborough showed the following 
section : 
Upper Estuarine 
Series. 
Lincolnshire 
Limestone. 
FT. IN. 
f Sandy and clayey beds ; showing lenti- 
i cular changes : with ochreous beds at 
I base - - - 12 to 15 
fBuff oolite, showing reddish tinges kT| 
places. Good wall-stone - - | 
i 1 Blue-hearted oolite, like some beds at I -,, 
*\ Ketton: used for road-stone, and f 
| called "Blue Stone," it breaks with 
[_ a cleaner fracture than good freestonej 
There are slight evidences of unconformity between the 
Estuarine beds aud Lincolnshire limestone. Clay was proved 
below the " Blue Stone," to a depth of 5 feet. This would corres- 
pond with the clay separating the Hibaldstow and Kirton Beds. 
West of Washingborough church a thickness of 42 feet of stone- 
beds was proved (down to water). 
The general section of the Lincolnshire Limestone, south of 
Lincoln may be summarized as follows : 
3. Buff and blue-hearted oolite more or less false- 
beddeci, and earthy oolitic limestone - 
2. Grey marly and shaly bed - 
("Compact and shelly limestone, grey limestones 
and shales 
1. <^ Sandy and oolitic limestones, and chalky and 
| creamy limestones (with scattered oolitic 
(_ grains), with bands of marl and shale 
FT. IN. FT. IN. 
12 
3 
Oto20 
Oto 5 
- 12 to 15 
about 30 
The lower beds (1) include the representatives of the stone 
worked at the Dean and Chapter Pit, Lincoln. Prom them I 
obtained specimens si Ammonites poly acanthus, Natica cincta, and 
