258 Rev. James Yates on the Structure of the 



tioned under the name of Leach Heath. The strata in this part principally 

 consist of an aggregation of siliceous crystals, rather loosely united by a 

 cement of clay; which is sometimes deeply reddened with oxyd of iron. The 

 crystals are never more than a line in length, but as perfectly formed as is 

 commonly the case in large crystals of the same substance. Their form is 

 that of six-sided prisms terminated by six-sided pyramids. The transverse 

 striae on the sides of the prisms are clearly discernible by the aid of the micro- 

 scope. These strata abound in fossil impressions of great delicacy, exhibiting 

 the forms of the Dudley trilobite, of the porpital madreporite of Parkinson, 

 of the joints of an actinocrinites, and of the same shells, which occur in the 

 associated limestone. Among these the impressions of the pentamerus are 

 especially interesting as showing the cavities derived from the septa, by which 

 that genus is so remarkably distinguished. Fragments, exhibiting these par- 

 ticulars, are strewed over the summit of the hill and over its eastern declivity, 

 and in the same situation there has been found a considerable quantity of the 

 common ore of manganese. Under the beds of limestone, which have been 

 already mentioned as occurring at the eastern base of this hill, and at a depth 

 of more than 100 yards from the surface, Mr. Attwood in sinking his shaft 

 came to beds of the quartz-rock, abounding in the same fossil impressions and 

 alternating with beds of a micaceous slate-clay. Many of the beds of this 

 quartz-rock, like that nearer the summit of the hill, consist of an aggregation 

 of minute siliceous crystals ; other beds are fine-grained and slaty, more 

 nearly resembling common sandstones. The micaceous shale, or slate-clay, 

 is for the most part of a deep red colour from the presence of oxyd of iron, 

 and frequently the quartz-rock in its vicinity partakes of the same character, 

 or, according to the miner's phrase, "runs red," 



The red micaceous shale, which has now been mentioned as occurring be- 

 tween the beds of quartz-rock, presents the same vegetable impressions, re- 

 sembling Fuci, which were before noticed as occurring in the slate-clay of 

 the superincumbent limestone. 



5. We now pass to a very interesting range of hills, which in their general 

 characters resemble the Lickey range, but are more extensive, more varied in 

 their component parts, and more illustrative of the connection of these detached 

 masses with the general stratification of England. These hills constitute a 

 diminutive, but very regular mountain chain, extending from N.W, to S,E. 

 beside the course of the Coventry canal and the river Anker. The towns of 

 Atherstone, Nuneaton, and Bedworth, are in their immediate vicinity. 



This range, like that of Bromsgrove Lickey, rises through an extensive 

 tract of red sandstone, which is seen advantageously at Baxterley Heath, 



