A. J. Jukes-Browne—Granite in a Boring at Bletchley. 357 
(ifs auily "atte. // alle 
14. Blue clay with septaria ............ 36 0 261 0 
vl5a Bluevlimestone suc eceeeeaseacescassce'« 1 0 262 0 
16. Blue clay with septaria ............ 40 0 302 0 
ey Bile? limestome see ccceececens successes 3 3 805 6 
18. Blue clay ............. Netteacesatacne 4 6 310 0 
19. Blue limestone .............e0cceeeeees 1 0 dll 0 
P40), 1S CNY, | Sdhoc-cenecbenecogsosdeceoore 45 0 3856 0 
91. Indurated bluish limestone......... Day 8) 378 5 
Ti. Grain AKO Lecanoaceteouseoseeoneen Pi 7 400 0 
Dem Olaye ans ae MEE Me dha Teh) ADIL ga, 
QAM Greate TOCKM pateener cubed ene sels Gie2) 407 2 
MBs (CIENT toceecdcecanobecoobactob ooo ncoRo.oc 2 10 410 0 
The following observations are chiefly by Mr. A. Timmins, with 
a few remarks of my own on the samples which he sent me, and 
which are now in the possession of Prof. A. H. Green at Oxford. 
No. 3 was a very hard blue clay. 
No. 4. A bituminous shale containing iron pyrites. 
No. 9. Sample preserved, a dark grey limestone, with well-marked 
oolitic structure, several Echinoderm spines, and some shell fragments. 
No. 11. Samples preserved probably from this bed are of a grey 
shelly and partially oolitic limestone. 
No. 13. Sample preserved from 224 feet, a light grey crystalline 
limestone, very hard, with glistening surfaces of calcite, possibly 
parts of Echinoderm tests and spines. 
No. 14. A very hard clay full of septaria and pyrites. 
No. 16. The same as No. 14. Samples of the septaria preserved 
and analysis made by Mr. Timmins with following result :— 
Insoluble siliceous matter ............cc0.c0 ceseeeee 9°800 
HeOn(orisinallypHeCOsereresscceseescresiasececseese) O4G41O 
He> Oy ions Neronid Ogee cn semecths odes selsst-eesh caceeees 33425 
PAN TIMMINN Baye iy cite ecanwe sak arc dae ste tcawedeumendacmeas 3°392 
Callciumicarbonatciyesssiereccetavsancere aces 17-050 
IMG o Mesum CATO ON atCssesHeadeeatectnesaescsoess 2-294 
100°374 
Nos. 18, 19, and 20. These beds were full of fossils, but all the 
larger specimens were broken up by the chisels; those preserved are 
chiefly fragments of the stems and arms of small Crinoids, with 
several pieces of small Belemnites and fragments of bivalve shells. 
They are just such fossils as would occur near the base of the 
Oxford Clay. 
No. 21. No sample preserved, but described by Mr. Timmins as a 
“ very hard limestone.” At about 360 feet it contained hard nodules 
or boulders of stone of a dark buff colour and having cracks filled 
up with calcite; they were calcareous and ferruginous, with only 
15 per cent. of insoluble matter. A sample from 3870 feet had the 
following composition :— 
Amsolmblexmattenymaadsaccmeeeasece cena ee ee aaeecee 53-48 
Oxidexon ironyandeal mina eee eee eee eae 20°40 
Calciummcanbonatemensseeeecce eeeeeee eee ae 26:06 
99-94. 
My colleague, Mr. A. G. Cameron, has sent me a piece of Kellaway 
rock, from Kempton, near Bedford, which is a very hard, compact, 
