GEOLOGr OF THE BRISTOL COAL-FIELD. 



329 



40. — A bed of gray limestone, containing Terehratula hastata 

 (Sow.) ; Sijringojjora geniculata (Edw.). 



41. — A bed of limestone, containing Producta y.'iA Rhjnchonella 

 pugnus. 



42. — Syringopora led.— A. bed of limestone, containing the 

 following corals. The last three beds are repetitions of those near 

 No. 33. 



Alveolites septosa (Edw.), depressa (Edw.) ; Chcetetes radians 

 (Plem.) ; Syringopora reticulata (Goldf.), lamellosa (Edwd.), 

 geniculata (Edwd.); Lithostrotionjunceum (Edwd.), affinis (Edwd.) ; 

 Ftylopora frustraformis (Phill. ) . 



Near this spot, and a few feet before the next mentioned bed, is 

 the long-famed Hotwell Spring, the water of which issues at the 

 rate of 60 gallons per minute, at a tolerably uniform temperature 

 of 70° Eahr. When freshly drawn, it is full of bubbles of Carbonic 

 Dioxide and Nitrogen Gases, of which the late Mr. Herapath 

 estimated that each gallon contained nearly 16 cubic inches. 

 According to that chemist, analysis shewed that the water 

 contained. 



Total soHd contents per gallon - 44-01o grains 

 43. — {2^1 b'].—Sole7iopsis led. — It is now difficult to examine 

 I)ecause it is not worked. It contains, however, many small corals, 

 bivalves and univalves The principal fossil is the Solenopsis minor ^ 

 which is tolerably plentiful and in good preservation. 



