part 2] INFERIOR OOLITE OF THE CREWKERNE DISTRICT. i7l 



north — what appears to be equivalent to their lowest poition is 

 softer and thicker. The Scissum Beds also fail between East 

 Chinnock and the Junction. 



The Scissum Beds are succeeded by the Ancolioceras Beds — at 

 the Conegar-Hill section, Broadwindsor, two strata, each 1 foot 

 thick. The Ancolioceras Beds extend into the Crewkerne district. 

 They are well exposed at the Misterton Lime works and at other 

 sections in the neighbourhood, and apparently were proved in the 

 now hlled-up quarry in Haselbury-Plucknett village. Probably 

 the Ancolioceras Beds persist throughout the Crewkerne district. 



The upper portion of the Murchisonm Beds is the main horizon 

 for Zeilleria anglica (Oppel). In the neighbourhood of Bea- 

 minster specimens of this brachiopod are very abundant. The true 

 Zeilleria-anglica Beds are absent from the Conegar-Hill section. 

 but occur at Drimpton in the extreme south of the district under 

 consideration. They have apparently been met with in the now 

 filled-up quarry in Haselbury Plucknett; but I have not detected 

 them elsewhere in the district. 



Attached in places to the top of the MJurchisonce-AncoJio- 

 ceras-Bed$ is ironshot rock, probably of bradfordt nsis hemera : 

 perhaps of late bradfordensis date — the date of the RhyncTionella- 

 ringens Beds of the Sherborne District. A thicker deposit of 

 bradfordensis hemera may be present in the neighbourhoods of 

 Dinnington and Haselbury Plucknett, for fossils have been found 

 by previous workers which suggest that this is the case ; but I 

 personally have not obtained any evidence. Ammonites in the 

 Moore Collection at Bath point to the occurrence of deposits of 

 concavi and discitce hemera? in the neighbourhood of Dinnmgton ; 

 hut I have not detected any deposit in the district that belonged 

 to a hemera between those of bradfordensis and garantiance. 

 Traces of rock of blagdeni hemera may occur, however, in the 

 neighbourhood of Dinnington. 



There is thus a great hiatus in the Inferior Oolite Series of the 

 Crewkerne district, there being — except possibly in the neighbour- 

 hood of Dinnington — no rock present assignable to any hemera 

 between those of bradfordensis and garantiance — the latter the 

 date of the wide-spreading Upper Trigonia Grit of the Cotteswold.s. 



The rock of garantiance hemera varies a good deal in lithic 

 characters, thickness, and the number of fossils that it contains in 

 the Crewkerne district. Thus, at the Misterton Limeworks it is 

 from 2 to 4 inches thick and practically unfossiliferous ; it is 

 wanting at South Perrott ; is very fossiliferous at North Perrott ; 

 contains few fossils at the Haselbury-Mill Quarry; but at Hinton 

 St. George is probably 6 feet thick, and very similar in appearance 

 to the Hadspen Stone of the Castle-Cary district. 



It has not been possible to identify definitely the Truellei 

 Bed in the district. Not more than the lowest 2 feet of the 

 Top Limestones may be of this hemera : the main part of these 

 limestones is of scJdoenbaclii date. The Schlcenbachi Beds 

 'attenuate' east of Crewkerne; but at Haselbury-Mill Quarry, in 



Q. J. G. S. No. 294. o 



