﻿498 J. Shipman — Bunter Conglomerate. 



or rounded, shallow cavities of an eroded surface of Bunter, and as 

 the Keuper reposes somewhat obliquely on the Bunter, there is an 

 unmistakable unconformity. The conglomerate is thickest at its 

 outcrop, and as it passes beneath the Keuper seems to lose some 

 of its compactness, and, in one spot I have seen, is represented by 

 pebbles stuck in a deep-red marly sand. Its usual development, 

 however, is in the form of a ferruginous compact crystalline band, 

 thickly studded with pebbles, and so hard that it is dreaded even 

 by navvies ; it varies in thickness between six inches and two feet, 

 and is sometimes swollen by lenticular beds of coarse bleached 

 sandstone as much as three feet thick. The most interesting ex- 

 posure of it about Nottingham existed, until lately, on the Hunger 

 Hill Eoad, and its character at this spot may be taken as fairly 

 typical of its fullest development. The conglomerate itself consisted 

 of pebbles, chiefly of quartz and quartz-rock, with fragments of 

 trap, volcanic ash, claystone, greenstone, slate, chert, bits of yel- 

 lowish limestone, permian magnesian limestone, and other rocks, 

 with a good deal of calcareous matter coating some of the pebbles, 

 in a ground-up form, and in minute crystals. Among the pebbles I 

 found what seems to have once formed the extremity of a sea-worn 

 pinnacle (for it was ribbed or fluted horizontally) of fine-grained 

 greenish Cambrian (?) sandstone. Eesting on the conglomerate was 

 a thin bed of grit cemented into cakes by calcareous matter, then 

 about two feet of bluish-grey soft bleached sand, irregularly bedded, 

 but having a general slope at about 5°, and passing under the 

 Keuper. False-bedding was shown here and there, with partings 

 of strings of pebbles. In nothing but the absence of sea-shells did 

 these beds differ from recent raised beaches met with on sandy 

 coasts at the present day. The pebbles are all similar to those 

 found in the Upper Bunter, while the sandstone is evidently re- 

 deposited Bunter ; so this conglomerate may possibly throw some 

 light on what happened in England during the interval between the 



Lower Keuper, with tlie Conglomerate, resting on Bimter — Turner Street, 



Nottingham. 



(Eeduced from a pen and ink sketch by the author.) 



Bunter and the Keuper subdivisions. The manner in which this 

 conglomerate rests on the Bunter is well shown in the above sketch 

 taken from a section in Turner Street, Nottingham. 



The conglomerate is surmounted by thin and thick bedded red 



