part 2] LiMKsroNK of thk leicestershike coaijikld. i>3 



places (A in PI. XI ) corresponds to the ix)sition indicated by the 

 wonls ' hniestone witli product its ' on the ti-ineh Maj) dej)osited 

 bv the late (\ Fc)x-Strani,'\vays at the otttces of the Geological 

 Survey; while the other place ( B) is the site of the * old quarry' 

 shown on the smie niaj). At both places the limestone is ari^il- 

 laej'ous, but that at A is more dolomitic than that at B. The 

 general dip oi the beds seen in the park is about (5^ a little south 

 of east. 



The beds of A arc sli«;litly hiL^her than those at B. Tiie 

 microscopic cliaracters of the limestone of A (see PI. X, tig. 3) 

 indicate a rock com|K)sed mainly of orL^anic remains — corals, small 

 brachiopods, and foraminifera. A fair auKJunt of recrystalli/.ed 

 calcite is present, and occasional rhoml)ohcdra of dolomite. These 

 rhombohedni are (piite idiomorj)hic and contain limonite, but there 

 is no zonal arraui^ement of inclusions. The propoi'ti(jn of mag- 

 nesium carbonate is about 12 per cent. Fossils are not jiarticularly 

 abundant, variants of Prodiicfua i/if/antri(Sy such as P. auritioi 

 and P. antlqitafiia, being the characteristic braehiopods. 



C'tn-als are rare, and I was unable to tind any s))ccimens except 

 Lithoxtrotion juncnini. These beds are evidently the e(|uivalent 

 of the foraminiferal limestones found towanls the bottom of the 

 ])eds ex])0sed in the ^Fain Quarry at Ticknall. The innnediately 

 tiucceeding strata are obscured by vegetiition, but some feet higher 

 a yellow dolomite similar in grain to that of Ticknall occurs. 

 Along the northern side t)f the stream the ground is much over- 

 grown, and 1 found no evidence concerning the unconformity of 

 the Millstone Grit shown on the (ireologieal Survey maj). At the 

 pivsent time the exposures show limestones alone, the Millstone 

 Grit being visible only on higher ground farther north, and the 

 intervening land is overgrown. The old (piarries on the south 

 exhibit grit only. It is to 1k> regretted that the examination of 

 the Calke exjtosures is a matter of great ditticulty ; and this fact, 

 together with the overgrown nature of the ground, now makes it 

 imjiossible to sec tlie exact relation of the Millstone Grit to the 

 underlvinir l»e<ls. 



The Dimmiiisdale Inlicr. 



A little to the south-east of Calke Park the Carboniferous 

 Limestone and s\ieceeding Shales cro|) out in a north-and-south 

 vaHey traversed by tlfc largest stream in the district. The Lime- 

 stone is shown in old workings that are now flooded to the level of 

 the U])per dolomite, the limestones below being inaccessible. Al)Out 

 IV) feet of shales are seen, confonnalde with the limestone below, 

 and jmssing up gradually and conformalily into Millstone Grit. 

 The gi-adual jMissage and conformity are strikingly exhibited at a 

 place (x on the map. PI. XI) «'ast of the stream, and overh>oking 

 one »)f the flooded tpuirries. Hen- the i^'romid li:is falh-n in, showing 

 the rock facing castwanN. iiorth\v;n(]>, wiid uestwanls in turn. 



i2 



