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CONGLOMERATES, CHARNWOOD FOREST. 



105 



hornblende, small slaty fragments and grains of quartz. Upper 



Extremely altered. Gallery. 



Marhfield. Composed of Wall " case &> 



32. 



•pebbles of hardened purple and grey slate, &c., bedded in a 

 gritty crystalline {porphyritic) base, containing crystals of 

 felspar and grains of quartz. 



The base of this is in part like 31, but the slaty fragments 

 have resisted even partial fusion. 



33. — Greenish purple altered conglomerate, Broad 



Hill. Pebbles smaller than in the above and more indis- 

 tinct. Porphyritic character more marked. Contains crys- 

 tals of glassy felspar in a felspathic base and grains of quartz. 



34. 



Pedlar 



This is a case of the most extreme alteration. In a dark 

 base are large crystals of red felspar and granular crystalline 

 quartz, set in a hornblendic (?) and felspathic base. In 

 a hand specimen this looks like an igneous rock. On the 

 ground the bedding is still traceable. 



35 — Altered rock, porphyritic and slightly talcose, 



Pla 



felspar. 



Felspathic base with crystals of 



Hornblende rudely aggregated in nests. 



Ex- 



tremely altered. 



36. —Altered rock, porphyritic. Blue felspathic base, 

 with crystals of felspar, and granular fragments and imper- 



feet crystals of quartz. 

 indistinct. 



ofpebbl 



From 30 to 36 the specimens are from rocks all exceed- 

 ingly altered, in which the amount of alteration gradually 



increases to a maximum. 



Further alteration probably 

 could not take place without entire obliteration of any trace 



of original structure, such as seems to have taken place 

 in No. 35. 



37— Imperfect greenstone, consisting of imperfectly 

 crystallised hornblende and felspar, with a few grains of 



quartz. 



Hill 



38 — Purplish 



Quorndon House. 



near Barrow-on-Soar, composed of red felspar and horn- 



