492 



Geological Society. 



Protolenus Limestone. Ac. 5. 



Stremiella Limestone Ac. 4. 



Microdiscus-bellimarginatus 



Limestone. Ac. 3. 



Olenellus Limestone of 



Lap worth. Ac. 2. 



Callavia Sandstone. 

 A sandstone division. 

 Holmia Sandstone. 

 A sandstone division. 

 Obolella-groomi Beds. 



Wrekin Quartzite. 



Ac. 1. 

 Ab. 4. 

 Ab. 3. 

 Ab. 2. 

 Ab. 1. 



Aa. 



Correlation Notes. 



Lower davidis fauna, Nuneaton. 

 (?) Hartshillia fauna, Nuneaton. 



J P. hiclcsi Zone, Scandinavia. 

 1 P. liicksi fauna, Nuneaton. 



J P. celandicus Zone, Scandinavia. 

 \ Pui'ley Shale, in part, Nuneaton. 



->^ J Purley Shale, in part, Nuneaton. 

 \ Protolenus Zone, New Brunswick. 

 fNorth Attleborough Beds, Massa- 

 ,1 J chusetts. 



J Callavia Beds of Manuel's Brook 

 1^ (Newfoundland). 

 Camp Hill Quartzite, Nuneaton 

 (After Lapworth.) 



( Tuttle Hill Quartzite, Nuneaton 

 ^ (after Lapworth). 



HoUybush Sandstone, Malvern. 



J 



f Malvern Quartzite. 

 <{ Park Hill Quartzite, Nuneaton 

 1^ (after Lapworth). 



After describing the brachiopoda, pteropoda, gasteropoda, and 

 a few ostracoda,- the Anther supplies lists of all the fossils known 

 to him, with the various horizons in ascending sequence, thus 

 giving their order of appearance in the Comley area. 



The first fauna to appear is one comparable with that of the 

 Hollybush Sandstone of Malvern. 



A second fauna in Horizon Ab 3 seems indicated by a species 

 referred provisionally to Holmia. A third fauna, divisible into 

 five sub-faunas, occurs in Horizons Ac 1 to Ac 5 : that is, in beds 

 associated with the Olenellus Limestone of Comley Quarry. The 

 brachiopoda, etc. accentuate the divergences of the sub-faunas 

 and include 19 hitherto undescribed species — G of brachiopoda, 

 8 of pteropoda, and 5 of gasteropoda. 



A fourth fauna appears in Horizon Ad. This horizon, a 

 part of the v^ell-known Black Limestone of Comley, marks the 

 dividing-line between the Lower and the Middle Cambrian, and 

 occurs again in the Wrekin district. 



An unconformity cuts out any further sequence, and brings in 

 the Pnradoxides Beds, in which a new species of Acrothyra 

 occurs. 



The succeeding five faunas are indicated in the correlations 

 given above, the evidence for the correlation of some 4 feet of beds 

 at the top of the sandstone series of Comley with the Paradoxicles- 

 forcliammeri Zone being supplied by seven or eight species of 

 brachiopoda. 



