GEOLOGY OF EAST NOTTINGHAM. 19 



visited again and again in order to obtain satisfactory results, chiefly 

 owing to the uncertainty of building operations being begun. Then there 

 was no map published that was on a scale large enough to admit of 

 detailed observations, so I enlarged one to a scale of one inch to 200 feet, 

 which, divided into small handy sections for field use, I found to answer 

 very well. For the levels, without which it would have been impossible 

 for me to have constructed the horizontal sections to illustrate the 

 character of the rocks below the surface, I am indebted to the kindness 

 of Mr. Tarbotton, the boi-ough engineer. No. 1 Section extends from the 

 top of Dame Agnes Street to a point on Blue Bell Hill, north-west to 

 south-east; No. 2, from Hawkridge Street, along Blue Bell Hill, to a 

 point a few yards beyond Belle Vue House ; and No. 3, from Great Alfred 

 Street South, along the slope of Blue Bell Hill, to Bombay Street ; each 

 to a scale of 50 feet to an inch, and a maximum depth of 220 feet. 



Turning now to the new map, perhaps the most striking featiu-e is a 

 broad, ribbon-like band of Keuper marl, shut in on each side by two 

 parallel white lines, stretching across the map from the south-east to 

 north-west. Those white lines are the equivalents of the straight and 

 the curved faults respectively of the Government map. The fault nearest 

 to Nottingham I have, for convenience, called No. 1 fault ; the equiva- 

 lent to the curved fault is No. 2. No. 1 fault, you will observe, has 

 the effect of bringing down the Lower Keuper marl (f5) alongside the Bunter 

 sandstone (f2) all along its coiu-se after leaving Blue Bell Hill, where the 

 outcrop of the Keuper is on the south-west side of the fault. This fault 

 strikes N.W., biit before reaching Mapperley Road it seems to become 

 deflected, bearing N.N.W., through Patchitt's Park, and joining No. 2 

 fault somewhere near the bottom of Bed Lane, while only a minor dislo- 

 cation is found taking the north-westerly coui-se. Both faiilts throw 

 down the Lower Keuper marl, the N.N.W. fault being well seen breaking 

 thi'ough the east end of the sandstone cliif and bringing down the Lower 

 Keuper twenty or thii-ty feet. Beyond No. 2 fault, that is on its north- 

 east side, instead of the thi-ee-cornered inlier of Bunter (f2) which appears 

 on the Government inap, we have a double tongue of Bunter stretching 

 up towards the Westminster Abbey, (as on the Government map,) on the 

 one hand, and fonning the valley at the foot of the Hunger Hills on the 

 othei' — evidently the extreixiity of a broad offshoot up the St. Ann's 

 Valley from the main area of Bunter to the south-west. We thus find 

 that what the Geological Surveyors supposed to be a curved fault turns 

 out to be a parallel fault to the straight one, striking about 55° west of 

 north. This fault was exposed diu-iug the excavations for lowering Map- 

 perley Koad, near the reservoir, some years ago, then at the top of Dame 

 Agnes Street, again half-way down that street, where it crosses obliquely, 

 and may be traced passing down Martin Street and through the 

 field where the St. Ann's Flower Show is held, across the hills to 

 Carlton Road, where it is again seen at the elbow tiu-n, and also in 

 a section off Crown Street, opposite. It appears to have a throw 

 of about 95ft. in Dame Agnes Street, increasing slightly further 

 south, throwing down the Upper Keuper alongside the Lower, and 

 the latter level with the Bunter. When cut through in Dame Agnes 

 Street this fault was found to hade to the south-east, just as we should 

 expect, considering that it unites with No. 1 fault, which hades in the 

 opposite direction, to let in a sort of broad wedge of clay rocks belonging 

 to a higher level ; and the s^Dace between the walls of the fault was filled 

 with pebbles embedded in a crystalline calcareous red sandy matrix, 

 associated with red marl and " skerry." Acting as a sort of connecting 

 link between the two main faults, and shifting the boundary line of the 

 Upper Keuper about four- hundi-ed feet, is a fault familiar enough to most 

 of us on account of its being long exposed in the section of marl opposite 



