VOL. XVIII. (3) DEEP BORING AT CHAVENAGE 243 



A DEEP BORING AT CHAVENAGE, near TETBURY, 

 GLOUCESTERSHIRE 



BY 

 L. RICHARDSON, F.a.S. 



In 1893-94 a deep bore-hole, roughly of 8 inches diameter 

 and 383 feet deep, was put down near Chavenage House — a 

 mile and three-quarters north-west-by -north of Tetbury Church. 



As Chavenage is situated upon the Forest Marble, it is 

 obvious that a bore-hole of such a depth is of considerable 

 interest to students of the Jurassic rocks, because it should 

 throw hght upon the thickness of the Great Oohte, Fullers' 

 Earth, and Inferior OoHte in this part of the Cotteswold Hills. 



Mr G. Lowsley-Williams, of Chavenage House, most 

 readily acceded to my request for the loan of the section of the 

 rocks passed through by the bore-hole, which had been made 

 by Mr Thomas HoUoway, F.G.S., of Chippenham, Wilts., and 

 has very kindly given me permission to publish it. 



The geological information given in this section, however, 

 is, not very detailed. 



As already remarked, Chavenage is situated upon the 

 Forest Marble Series. In Mr Hollo way's section the first 39 

 feet of rocks passed through is assigned to this Series. 



The beds from 39 to 158 feet down are labelled " Great 

 Oolite and Stonesfield Beds." 



I am inclined to think that the 

 63 feet of rock from 39 to 102 feet = the ordinary Great 

 Oolite hmestones, of which 60 feet were proved in the 

 Kemble bore-hole,' 



and that the 



56 feet of rock from 102 to 158 feet = the " Passage-Beds " 

 of the Kemble bore-hole. The Fullers' Earth — according to 



I Proc. Cotteswold Nat. F.C., vol. xviii., pt. 2 (1913), pp. 185-189. 



