Vol. 50.] BOEINGS AT CULFORD, WINKFIELD, WAKE, AND CHESHENT. 503 



Having examined the samples sent us from the Ware boring we 

 selected 20, about which it seemed probable that the microscope 

 would reveal more exact information. These were sent to our friend 

 Mr. W. Hill, who has been good enough to slice and examine them, 

 and to furnish us with a written account of the minute structure of 

 each slide. 



When a sufficient number of samples have been preserved from 

 the strata traversed by a boring, we think that they deserve a more 

 careful and detailed description than specimens obtained from a 

 quarry, because the section is not open to observation and yet may 

 be far more extensive and important than any quarry-section. We 

 propose, therefore, to give a general description of all the specimens 

 sent us by Mr. Francis, inserting Mr. Hill's notes on those specially 

 examined by him. 



Description of Samples. 



The figures represent the depth in feet from the surface from 

 which the sample was taken, but Mr. Francis informs us that many 

 were cut off cores of more than a foot in length, and consequently 

 the depth assigned may not be exact, though near enough for ail 

 practical purposes. 



116. Soft white chalk. Under the microscope shows a fine 

 amorphous matrix with a fair number of small shell-fragments. 

 Resembles chalk from the zone of Micraster cor-testudinaritim. 



145 & 149. Soft white chalk ; that from 149 has a thin streak of 

 grey marl. It was sliced by Mr. Hill, who describes it as 

 consisting mainly of fine amorphous material in which can be 

 seen a fair number of thin-shelled spheres, some foraminiferal 

 cells, and many minute Textularue, with a few small shelly 

 fragments. The marly part contains a greater number of larger 

 shell-fragments, arranged with their longer axes in one direc- 

 tion, as if by current action. 



160, 172. Soft white chalk. 172 consists chiefly of amorphous 

 material, with many spheres and some small shell-fragments. 



174, 178. Firm, rather tough chalk, with wavy grey streaks of 

 marly material. 



211, 212. Rather hard white chalk. Of 211 Mr. Hill says :— " A 

 good specimen of Middle Chalk ; spheres are fairly abundant, 

 the majority thin-shelled ; a few large Globigerince occur ; 

 shell-fragments are few and small." 



231, 246. Soft white chalk. 



287, 340. Firm white chalk. 



387. Rather hard white chalk. A slice showed the usual characters 

 of the lower part of the Terebratulina gracilis-zone. " Spheres 

 with a fairly robust shell are abundant ; Globigerince common 

 and large ; shell-fragments few, but two large Inoceramus- 

 prisms occur in the slide." 



411. Hard creamy-white chalk. In a slide of this Mr. Hill finds 

 " shelly fragments abundant, some consisting of many united 

 prisms (Inoceraimis) ; spheres are abundant and robust. It 

 clearly comes from the zone of Inoceramus mytiloides." 



