THE CAM Hi; IAN SYSTEM 91 



The red limestone contains Olcnellus Callavei, Mieroditeut 

 l,.-lfna with new species of Ptychopana, and Micmaceia, and 

 Kutnrgina cingulata. The grey limestones have yi.-M. 

 species of Protolemis, Microdiscus, Anomocare, and Mali 

 I .iiu- Brachiopoda. The black limestone contains Hyulites, 

 Satterella, and Brachiopoda. 



The overlying conglomeratic grit with its derived fragments 

 indicates a local break with erosion of the beds below eo that it 

 may be inferred that the latter are only a part of the series 

 originally deposited. This upper grit has yielded three species of 

 Paradoxides (P. Groomi, P. rugulosus, and P. cf. Daridit}, 



In the Lickey district there is an exposure of quartzite which 

 is almost certainly of Lower Cambrian age, though no fossils except 

 worm-burrows have yet been found in it It consists of flaggy 



Fig. 22. SECTION FROM KUXEATON TO CALDKCOTE HI I.I, (I JjlWOtt ll ) 



/. Keuper marls. o2. Hyolithes Beds. 



'!'. Coal-measures. ai. Cambrian quartsite. 



" 4 . Oldbury sh.-i!.--. A. Caldecote volcanic rocks. 



s . Piirley shales. Diorite dykes shown in black. 



quartzites, with intercalated purple shales like those next de- 

 scribed. 



Near Nuneaton there is a remarkable tract of Cambrian roclu 

 which before the discovery of fossils was supposed to be of Car- 

 boniferous age. It is about 9 miles in length, with a width of a 

 mile where broadest, and the structure of the district is shown in 

 the section drawn by Professor Lapwoith (Fig. 22). The arenaceous 

 division has been called the Hartshill quartzite, and is about 600 

 feet thick. The lower part consists of alternating beds of siliceous 

 grit and purple or grey shale, the grits consisting of sand set in .-i 

 chalcedonic cement, and forming a very hard rock which has 

 usually a pale pink colour. No fossils have yet been found in 

 them. The middle portion consists of thick beds of qitartzitic grit 

 with very little shale, and has not yielded any fossils. The Upper 

 or Camp Hill Group is a much more varied set of beds, consisting 

 at the base of thin-bedded glauconitic grits, followed by sandy 

 micaceous shales about 50 feet thick, in which an- two notabU- 

 beds, one a pebble bed or conglomerate ami tin- <>tln r a bed of red 

 limestone about 2 feet thick. The highest memU-r i- u maw of 



