392 MR. S. S. BTJCKMAN ON THE BAJOCIAN [Aug. 1 89 5, 



based on his acceptance of a section of Leckhampton Hill by Strick- 

 land, 1 which is certainly incorrect. Witchell's amended figure of 

 27 feet is founded on Wright's section of Cleeve Hill, 2 about which 

 scepticism is very essential. Thus 27 feet are there shown above 

 the Upper Freestone with Chemnitzia-gxit on the top, but the 

 Ohemnitzia-gvit "Wright himself placed at the bottom in his Ravens- 

 gate section, below the Lower Trigonia-grit, and resting on the 

 Upper Freestone. 3 



The necessity for clearing up misconceptions is very obvious, and 

 this one about the Lower Trigonia-grit is important. "When my 

 friend the late Mr. E. Witchell showed me certain ammonites from 

 what he called the ' Gryphite-grit of Stroud,' i I was able to 

 correlate that deposit with a particular bed of Dorset. 5 I correlate 

 it with the same bed to-day; but, with the greater precision 

 attempted in my former paper, I can state that the deposit from 

 which these ammonites came was laid down during the discitce 

 hemera. 



That Cotteswold geologists had misunderstood the Gryphite-grit 

 did not occur to me, and therefore I correlated that deposit all over 

 the Cotteswolds with the same Dorset bed. During the work for 

 my former paper the mistake was discovered : the true Gryphite-grit 

 was of later date, the bed from which Witchell's ammonites came 

 was the Lower Trigonia-grit. Thus was brought to light a serious 

 error in the work of three Cotteswold geologists who have made the 

 Hills their special study. This error needs correction, because it 



1 ' Cotteswold Hills,' p. 35. 



2 ' Correlation of Jurassic Hocks,' Proc. Cotteswold Nat. Field Club, vol. v. 

 (1870) p. 143, and repeated in 'Monogr. Lias Amm.' p. 155 (Pal. Soc. 1879). 



3 Quart. Journ. Geol. Soc. vol. xvi. (1860) p. 40. 



4 The following notes were made about eight years ago, on examination of 

 Mr. Witchell's specimens. I am not able to cbeck the determinations again. 

 In certain cases I have interpreted and amended the notes in accordance with 

 present nomenclature. The following is the transcription : — 



\Hyperlioceras\ ' WalJceri, from Rod- ' Sonninia adicra [a tuberculate form 



borough Hill and Frith Quarry ; aff. Sonninia spinosa, probably]. 



Gryphite- [Lower Trigonia-] Frith Quarry.' 



grit. Several specimens.' Several species aff. Ludwigia ' Mur- 



[H.] ' discoideum. Frith Quarry ; chisonce. Oolite Marl and Free- 



Gryphite- [Lower Trigonia-~\ stone ; Frith Quarry.' 



grit. 1 example.' Stephanoceras of the Hnmphriesianum 



\H.~\ ' discoideum. Frith Quarry ; a type. ' Gryphite-grit ; Eodbo- 



very thin variety. 2 examples. rough. Same form as in Sow- 



[L. T.-g.]' erbgi-hed [Fossil Bed, discitcs 



[HJ] ' discites. Frith Quarry and hemera] of Bradford Abbas.' 



Eodborough ; Gryphite- [Lower Large Perisphinctes [with depressed, 



Trigonia-~] grit.' semilunar whorls]. Clgpeus-grit ; 



' Oppelia fusca. Clgpeus-gvit ; Stroud Stroud Hill. [Perhaps allied to 



Hill.' ' Steph. ' crassizigzag, S. Buckm.] 



As ammonites are scarce in the Cotteswolds, and as this list represents about 

 twenty years' work on Mr. Witchell's part, even such a record is of service. 



5 ' Inf. Ool. betw. Andoversford, etc.,' Proc. Cotteswold Nat. Field Club, 

 vol. ix. (1887) p. 130; Quart. Journ. Geol. Soc. vol. xlv. (1889), table facing 

 p. 460. 



