20 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [NoV. 22, 



that " this horizontal Crag " (i. e. the phosphatic nodule bed) " passes 

 up into the Chillesford beds at Chillesford." 



In short, Mr. Wood's views, as he informs me, are these, " That 

 the Eed and Fluvio-marine Crag are coeval ; while the Chillesford 

 beds are but a fossiliferous (and that only local) horizon of the 

 " middle drift," at about one-third to one-half of the distance from 

 the base of that deposit, the horizontal crag being only the very 

 base of the ^ middle drift ' over parts of the Eed Crag area." 



I feel that any contribution towards the solution of this interesting 

 though limited problem is worth recording, and I can assure the 

 Society that my companion and I made our first examination with 

 no previous bias towards one view rather than another. 



The section at Chillesford loam-pit close to the chancel of the 

 church gives— ft. in. 



Drift from the Boulder-clay 5 



Brown laminated loam with crushed shells 2 



Micaceous brown sand 7 



Light-brown sand with Myee in their natural burrows 6 



Coarse sands, less micaceous, and not laminated. 



In the adjoining pit of Eed Crag, distant about fifty-eight yards, 

 there is a difference in character between the upper and lower half 

 of the section. The lower has the ordinary aspect of Eed Crag, but 

 the upper appears to be a continuation of the sands of the loam-pit. 



There is in the upper part a bed of shells horizontally stratified, 

 a foot thick at about 5 feet below the level of the Mya-bed in the 

 loam-pit. Then succeed 5 feet more of horizontally drifted shelly 

 sand, which rests on the ordinary obliquely laminated Eed Crag. 



Proceeding to Chillesford brick-pit, the loamy clay is dug for 

 15 feet, down to a shelly sand, but I did not meet with Myae in it. 

 In other respects the deposit agrees very closely in character with that 

 in the pit behind the church. In these two pits the grey colour so 

 characteristic of this bed at some points is only observable in a few 

 thin layers, the prevailing colour here being a light brown. 



The same clay, of a greyish-brown colour, and resting on yellowish 

 sands, is met with in a clay-pit at"the western corner of Sudbourn 

 Park. The porous character of the sands is shown by the fact that 

 a field-drain, yielding a continuous stream of water, is turned into 

 the pit, and sinks away without forming any pool. The substratum 

 at this place must be Coralline Crag, which comes to the surface just 

 inside the park. 



Thus far these Chillesford beds appear to consist of laminated 

 micaceous clays, sometimes brown and sometimes grey, having at 

 their base a sandy band, at some spots containing Myce truncatce in 

 their natural burrows, the whole resting on a loose yellowish-brown 

 sand. These beds indiscriminately overlie the Eed and Coralline 

 Crags. We found these beds again more or less modified between 

 Aldborough and the pit at Thorpe, near Aldborough, where the Fluvio- 

 marine Crag appears. There were indications at that spot which 

 appeared to us to show that the Chillesford beds pass under this Crag, 

 and I commenced the present paper upon the data we had so far 



