54 ' PROCEEDINGS COTTESWOLD CLUB 1910 



the places indicated on the map by the corresponding figures : 

 Oxynotoceras oxynotum (i) ; Arietites turneri and Asteroceras 

 cf. hrooki (Sow.) (2) ; Vermiceras landrioti (d'Orb.) (3) ; 

 Pleurotonaria anglica. Sow. {4) ; Arnioceras hartmanni (Oppel) 

 (5) ; and Gryphcea arcuata, common (6). 



In all, evidence of seven Liassic zones was obtained, 

 namely, those laid down during the hemerae marmorea, roti- 

 formis, gmuendensis, birchi, turneri, obtusi, and oxynoti. 



Hatherley Sewer. — There is nothing to record with 

 regard to this Sewer beyond what is appended to the map 

 (text-figure i), and the information given above. 



Arle Sewer. — I am indebted to Mr Edwin Earp for the 

 following details concerning this sewer : — 



" The new outfall sewer from the Arle Tanks adjoining the 



Refuse Destructor and Electric Light Works, will convey most 



of the sewage from Charlton Kings and Cheltenham to the 



Corporation Sewage-Farm at Haydon, on the western border 



of the borough. The route is via Hester's Way and Arle 



Village, and is about two miles in length, with a gradient in 



the sewer of i in 800. From Haydon Farm to Arle Village 



(about two-thirds of its length) the sewer is egg-shaped in 



section, measuring 3 ft. 9 ins. by 2 ft. 6 ins. internally, and is 



constructed of concrete in the invert half lined with bricks ; 



while the upper portion is a double-ring brick-arch. The depth 



at which it is laid varies from 6 feet to 40 feet, and in this 



section the excavations were chiefly in stiff blue Lias clay. 



Where the depth ranged from 15 ft. to 40 ft. between Haydon 



Farm and Hester's Way, the sewer was constructed in tunnel, 



with pits about one hundred feet apart. The excavation and 



the work generally in-tunnel was greatly impeded by the 



presence of rock and water. The first few feet of excavation 



consisted of loamy and gravelly clay, followed by stiff clay, and 



a seam of rock was met with at 12 feet deep, and springs 



of water at about 23 feet deep, after which rock was again met 



with in places. From Arle Village to the Arle Tanks the 



sewer is of 30-inch diameter stoneware pipes, and is laid on and 



partly surrounded with concrete ; it has a gradient of i in 242, 



with a depth varying from 6 to 14 feet. The subsoil in this 



' 



