Vol. 52.] ON THE UPPER PORTION OF DUNDRT HILL. 680 



Section VII. {continued). 



ft. ins. ft. ins. 



GarantianjE forme, Pholadomya sp., Trigonia sp., 



{cont.). were found in these excavations or in 



the film of this matrix on the top of 



the bed. Actaonina, sp., was found in 



a tube perforated in the crystalline 



limestone 5 



3. ' The Conglomerate-bed.' Pale grey, 

 crystalline limestone containing many 

 derived lumps of a bluish-grey sand- 

 stone, generally bored by Lithodomi, 

 and many more irregularly-sbaped 

 lumps of an oolitic, limonitic ironstone. 

 One flattened boulder of tbis sandstone, 

 measuring about 2' 10"xl4"x3", 

 considerably bored by Lithodomi which 

 remain in it, lay in the upper part of 

 the bed ; Astarte Manseli, Myoconcha 

 crassa, Trigonia aff. costata, Limatula 

 gibbosa, Gouldia oralis, Cucullcea sp., 

 Opis lunulatus, Ostrea sp., Pecten sp., 

 Lima sp., Pseudomelania coarctata, 

 Cerithium subscalariforme, Ataph?ws 

 obtortus, A. Labadyei, A. sp., Trochus 

 biarmatus, Natica sp., Belemnites 

 sp., Parkinsonia cf. Garantiana?- 

 and Strophodus sp., are indigenous. 

 Tbere are derived fragments of 

 Grammoceras aff. aalcnse ; much - 

 rolled fragments of Hildoceratidae, 

 presumably Grammoceras spp., and 

 fragments of Dumortieria, mostly 

 showing a matrix of bluisb-grey sand- 

 stone 6 



Dumortierle. 4. Compact, bluish-grey, argillaceous sand- 

 stone in two beds. It contains frag- 

 ments of two or tbree species of coarsely 

 and finely costate DumortiericB 1 



Immediately above the Dumortieria-heds lies the remarkable 

 conglomerate-bed formed during the Garantiance hemera — specimens 

 of Parkinsonia cf. Garantiana having been found in it. Here, then, 

 is a case of very noticeable non-sequential deposition, denudation 

 being presumably the agency which has removed whatever strata 

 may have been deposited ; and in all probability, considering the 

 short distance, — for the Ironshot Oolite is found in an arable field 

 only 7 furlongs to the west — there was originally at Maes Knoll a 

 sequence of deposits similar to that found at the Main-road quarries 

 and at Rackledown (see Sections IV., IX., & X.). 



This denudation, no doubt, was in progress partly during 

 Bajocian time, and therefore it was contemporaneous with what 

 was called ' Bajocian denudation ' by one of us. 2 But it is evident 



1 Slightly more umbilicate, a little more compressed. 



1 S. S. Buckman, ' The Bajocian of the Mid Cotteswolds,' Quart. Journ. Geoi. 

 Soc. vol. li. (1895) p. 431. 



3a 2 



