556 



PROCEEBINGS OP THE GEOLOGICAL SOCIETY. [June 20, 



And first, as I have already observed, the trail is derived from 

 some not very distant point of higher ground. 



Secondly, where the trail contains pebbles it will be noticed that 

 their axes, more frequently than not, deviate from the horizontal 

 position. 



Thirdly, the trail sometimes contains portions of incoherent beds, 

 which nevertheless are not scattered and disseminated as would be 



Pig. 2. — Section of Trail in a Pit east of Chillesford Church, Suffolk. 





a. Warp defined by an intermittent layer of pebbles of chalk and small flints. 



b. Trail from Boulder-clay with chalk and oolitic pebbles and fossils. 



c. A layer of drift from the Chillesford Clay. 



h'. Drift from the Boulder-clay, a repetition of b. 



d. Chillesford Clay. 



Fig. 3. — Section of Trail at Calne Railway -station, Wilts. 



a. Warp. b. Trail of red sandy gravel. c. Coral rag. 



Fig. 4. — Section of Trail at Woking, Surrey. 



;i^-£2^=^^ _ b. Trail, with axes of peb- 



^'J-=ir^i.-=s -• bles mostly vertical. 



S'~ -^~^ c. Sandy clay horizontally 



:i^~ — '~ stratified. The locality 



"^" ~ is nearly level. 



the case if they had been water-drifted. I have noticed this fact, espe- 

 cially, in some Crag-pits in Suffolk. For instance, in the large Coral- 

 line Crag-pit near Aldborough, Mr. S. Y. Wood, jun., has mentioned 

 patches of what he supposes to be Red Crag, and also phosphatic 

 nodules, overlying the Coralline. Both of these occur in the trail. 

 The so-called Eed Crag probably consists of a portion of the Mya- 

 truncata bed, which would occur in ordinary sequence a furlong or 



