ON SOME LACUSTRINE DEPOSITS 



On some Lacustrine Deposits in the Drift near Ferryhill. 



By John Coggin Brown, B.Sc. 



Read June 3RD, 1905. 



At the Dean and Chapter Colliery just west of Ferryhill 

 village, and about two miles to the west of Ferryhill Station 

 (which lies on the main line of the N.E.R. nine miles south of 

 Durham), three new sections have been made in the drift 

 which revealed an interesting local development of these 

 deposits. As the accompanying sketch map (p. 289) shows, 

 the sections are close to the main road from Durham to 

 Ferryhill, and almost on the footpath joining the latter place 

 to Spennymoor. Their exact dimensions and position are 

 seen from the plan given below. 



isfettd^ep 



3sfeeteUep 



PLANofCUTTINGS 



IN ORIP-T- . 



Settle,, liru^ '=^4oyaTds 



Ohlique'sJuidingsJioivs 

 position/ of the. Oeposits 



Fig. I. The depth of cutting C at its eastern end is 3 feet. 



Three cuttings running parallel, and approximately east 

 and west, have been made; the two to the south gradually 

 deepen towards the west,, as the ground gently ascends in 

 that direction. The outcrop of the Magnesian Limestone 

 rises up as a steep-sided hill about 200 yards to the south, 

 and there is also a thin outHer of the limestone about 200 

 yards to the north of the cuttmgs. 



In the first exposure (marked A on the plan) the drift was 

 observed to be of the usual character found in this district, 

 and consisted of stiff brownish clay with a few sub-angular 



