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At Crossvvick's, Gideon Middleton has a marl pit near the mill, 

 in which the layers are as follows : 



1. A micaceous tough clay on the top. 



2. A rather greenish gray marl, somewhat micaceous, but 

 pretty rich. Beneath this, one foot of ferruginous marly concre- 

 tions, each about the size of a man's head. 



3. A dark blue marl. 



4. A black sand and marl. 



In sinking a well at his house, many years ago, the beds 

 traversed were ten feet of yellow sand, then twenty-seven feet of 

 marl, and below all a white sand. Low down in the pit just 

 spoken of, shells, belemnites, &c. occur. Fossil wood, with 

 much pyrites attached, is sometimes seen in the marl pit near the 

 bottom. 



This marl is highly fertilizing, as Mr. Middleton's fields show. 

 Mr. M. has mixed it with lime with very beneficial results. In the 

 upper stratum, yellow incrustations of efflorescent sulphate of 

 iron abound. 



Marl from the farm of Gideon Middleton. 



Composition. — In 100 parts: 



Greensand, - - - 68-00 



Clay, .... 29.00 



Quartzose sand, - - 3-00 



100-00 

 The proportion of potash which this marl contains, deduced 

 from that in the greensand, is 7-8 per cent. 



The marl is very good one mile lower down upon Cross- 

 wick's creek, at David Killey's. It lies in a bank on the side of 

 the meadows along the creek, and has a top layer of the black 

 astringent clayey or spurious marl. There is a good marl on 

 Crosswick's creek, half a mile above Hogsback landing, and I 

 am told it extends still lower down. This proximity to the rail- 

 road is a matter of much importance to the adjacent region. 



Near the Sand Hills, and in places between these and Borden- 

 town, the lower or spurious marl stratum is visible in the sections 

 of the railroad, and I am now firmly of the opinion, that the clay 



