20 GEOLOGY OF EAST NOTTINGHAII. 



Craumer Quadrant, wbere it is seen bringing down the lower beds of the 

 Upper Keuper alongside the marlstoues of the Lower Keuper. This 

 fault strikes north 40° west, with a throw of apparently about 15ft. ; 

 it is not again seen. It so much resembles No. 1 fault, as seen 

 on Blue Bell Hill, that one can scarcely wonder that, in the absence of 

 more complete data, the Sm-vey should have regarded it as a continuaticni 

 of the same fault, lleverting to No. 1 fault, it evidently forms quite a 

 focus of small dislocations on lilue Bell Hill, varying in direction between 

 west and north. One of these, bearing 10" north of west, and throwing 

 dowai the Lower Keuper against Bunter about 10ft., produces the tri- 

 angular patch of Bunter, ]usfc at the apex of which were a few feet of 

 Lower Keuj)er capping the Bunter. When these beds were cut through 

 during the formation of Turner Street, a remarkably interesting section 

 of the conglomerate at the base of the Low^er Keuper was exposed.* Un- 

 fortunately, however, it has since been removed for building purposes. 

 Another fault, having a down throw of Oft. Bin. on the east side, is tx'ace- 

 able crossing Blue BeU HiU lioad 12° west of north, and coming out in 

 the cliff in Lower Beacon Street. The other minor dislocations marked 

 on the new map, mostly parallel with this, all have a downthrow to the 

 east, but they are of no further importance than to serve to show the 

 general tendency of the down-throw of the faults on Blue Bell Hill, east 

 of No. 1 fault. In fact I met with more dislocations radiating from No. 

 1 fault than in an\' other part. I ought not to omit to mention that No. 

 1 fault is finely exxiosed in the section opposite the saw mills on the Blue 

 Bell Hill Eoad. The Lower Keuper between Pease Hill Bead and 

 the llobin Hood's Chase is also much disturbed by faults. Two or 

 three may be seen in the brick yard there, but others, having a 

 downthrow to the north-east, probably exist ; for, on the down-thi'ow side 

 of No. 1 fault at the junction of Cooper Street and Pease Hill lioad, the 

 Bunter was met with at a depth of 16 feet, while near the Chase, wth a 

 rise of groiind of about 14 feet, the Bunter was not reached till a depth of 

 54 feet of Lower Keuper had beeu passed thi'ough, and then onlj' on the 

 upthrow side of a fault which was found to cut through the well. 

 Again, just where we might expect to find the lowest beds of the Keuper, 

 namely, at the bottom of Dame Agnes Street, over 40 feet of water- 

 stones have been pierced without reaching the Bunter. This, coupled 

 with the fact that brickyards existed years ago along the bottom of Blue 

 BeU Hill on St. Ann's Iload, leads me to infer the existence of a series of 

 transverse faults running nearly parallel with that road, and letting in 

 the higher beds of the Keuper. 



"Uliilc tracing the fault I have mentioned in the Beacon Street Cliff, 

 I came across some very interesting geodes in the Lower Keuper sand- 

 stone beds. The geodes ramified in the thick beds of sandstone without 

 any regard to the lamination ; were lined with rhombohedi'al crystals of 

 calcite, occasionally tinged with copper and a black mineral — probably 

 manganese ; and appeared to have been formed long after deposition and 

 consolidation of the rock. The crystals were all rhombohedrons, except 

 where the copper or the black substance was present, when they became 

 double six-sided pyi-amids. These ai'o the first crystals of calcite, as far 

 as I know, tliat have been found in the Keuper — at least in this district. 

 The geodes extended through about three feet of the mai'lstone, and were 

 confined laterally to the space of a few scjuare yards. The calcareous 

 matter appeared to have come from above, a thin lenticular band of it, 

 about three feet long, being met with about five feet above where the 

 gi'odes wore found. 



[to be COXTINUEn.] 



■ This conplnmeratc is dcscrilicil at a Inter stage. 



