410 MR. 8. S. BUCKMAN ON THE BAJOCIAN [Aug. 1 895, 



Section XVII. — Leckhampton Hill. 1 



ft. ins. ft. ina. 



Upper Trigonia-grit 5 



Notgrove Freestone 2 



Gryphite-grit 5 



BucJcmani-gvit. Sandy limestone 7 8 2 



Yellow sand 6 



Yellowish and purplish marl, with T. 



Buckmani towards the lower part 3 . . . 1 



Yellowish brown limestone 2 6 



11 8 



Lower Trigonia- Aulacothyris Meriani 2 feet from the base 7 



grit. 



Harford Sands Yellow clayey marl 2 



equivalent. 



Upper Freestone. Brownish disintegrated oolitic shale 2 



Freestone. 



The north-easterly route taken is now interrupted hy the steep 

 escarpment of Leckhampton Hill, overhanging the valley of the Chelt. 

 At some future time it may be of interest to follow these beds in 

 the same direction on the other side of the valley — across Cleeve 

 Hill up the Northern Cotteswolds. For the present, however, it is 

 necessary to turn aside and take an easterly course; but before 

 doing so the following remarks may be made on the sections given. 



It has been by no means difficult to show the continuity of the 

 Lower Trigonia-grit * from the neighbourhood of Stroud to Leck- 

 hampton, wherever any of the intervening beds are present. It 

 has moreover been found persistently at a certain distance below the 

 horizon of Terebratula Buckmani. The sections will also have made 

 it clear that beds contemporaneous with the Gryphite-grit of Leck- 

 hampton occur in the Stroud neighbourhood, separated by a more or 

 less considerable thickness from the Lower Trigonia-grit, and always 

 above the horizon of Terebratula Buckmani. It will therefore be 

 evident that to call the Lower Trigonia-grit of the Stroud district 



1 A section of the ragstone-beds of this hill was given in my paper on the 

 Bajocian, etc. (Quart. Journ. Geol. Soc. vol. xlix. p. 511), to which the reader 

 is referred. A few details have been added, chiefly of beds ill-exposed at Leck- 

 hampton, but better shown on the adjoining Charlton Common, for section of 

 which see p. 412. 



2 It was estimated at about 10 feet for Leckhampton Hill, but this correction 

 is made from exposures in Charlton Common. 



3 The marl and overlying sand have been proved at the Windlass and traced 

 along Charlton Common. 



4 That the Lower Trigonia-grit of the Cotteswolds was deposited during 

 the discitcB hemera is now well supported by the ammonite-evidence. Wistley 

 Hill (see p. 414), Stroud Hill, the Frith, Bodborough, and Leckhampton have 

 lately yielded to me ammonites indicative of this hemera; and they agree 

 with what Mr. Witchell found at Frith quarry and at Bodborough ; while 

 Mr. Upton has obtained confirmatory evidence at the Frith and Stroud Hill. 

 This deposit can therefore be correlated exactly with Dorset. Above this is a 

 considerable thickness of strata — the T. Buckma?ii-gvit —-which might "strictly 

 be considered as deposited during a post-discitcs hemera. Above this again is 

 the Gryphite-grit, which contains ammonites of the fissilobata-ovalis type and 

 latumbilicate Witchettice. It can be correlated exactly with Sandford Lane 

 (former paper, p. 492, bed 6 K c, and p. 494). 



