452 Notices of Memoirs — British Association — 



II. — Abstracts of Papers read in Section C (^Geology), Meeting of 

 British Association, Birmingham, September 10-17, 1913. 



(1) Notes on certain Teilobites found in the Stockingford Shales. 

 By V. C. Illing, B.A... F.G.S. 



AMONG the fossils found at Hartshill Hayes, in the Abbey Shale 

 ^ subdivision of the Stockingford Shales, numerous forms occur, 

 representing young stages in the development of certain Trilobite 

 genera. Among these are the following: — 



1. Liostracus sp. — The development is similar to that of Liostracus 

 as described by G. F. Matthew. 



2. Holocephalina sp. — The early stages of this genus possess a well- 

 marked glabella, widening anteriorly. This becomes less convex in 

 later stages, its anterior margin disappears, and finally the glabella 

 is only represented by two short posterior grooves. 



3. Paradoxides Hicksii. — The development is similar to that of 

 Paradoxides as described, by G. F. Matthew. 



4. Certain new forms of Agnostiis. — The anterior portion of the 

 glabella becomes obliterated in the later stages, while the axis of the 

 tail becomes relatively larger with increased development. 



yYl\^\ (2) Recent Discoveries in the Stockingford Shales 



?^ 



Nuneaton. By V. C. Illing, B.A., F.G.S. 



DURING recent mapping of the subdivisions of the Stockingford 

 Shales between Nuneaton and Merevale, fossils have been found 

 at various horizons which indicate that the Cambrian succession in 

 this area is almost, if not quite, complete. Among these fossil- 

 bearing horizons are the following : — 



1. Lower Purley Shales. — Shales from a surface working 200 yards 

 south of Worthington Farm, near Hartshill, contain fragments of 

 Olenelliis. The fossiliferous beds are 40 feet above the base of 

 Purley Shales. 



Mr. Pringle, of the Geological Survey, has found Olenellus in 

 nodules at the base of the Purley Shales in Jee's Sett Quarry 

 (Summary of Progress, 1913). 



2. Lower Oldbury Shales. — {a) Excavations in Hartshill Hayes 

 have proved that the basal 90 feet of the Oldbury Shales are of 

 Menevian age. They contain the zones of Paradoxides Bavidis and 

 P. ILichsii in their upper and middle beds', while the lower beds 

 contain Agnostus atavus, and correspond with Tullberg's Ag. atavus 

 zone, and with part at least of the Lower Menevian of Sweden. The 

 Trilobite fauna includes the genera Paradoxides, Atiopolenus, Cono- 

 coryphe, Holocephalina, Liostracus, Microdiscus, and Agnostus, no less 

 than fifteen species of the last genus having been found. At the top 

 of the series there occurs a calcareous conglomerate, containing 

 fragments of the underlying type of sliule and indicating a probable 

 unconformity. 



(b) In a new cutting near Oldbury Reservoir Olenus truncatus and 

 Ag. pisiformis, var. obesus, occur, proving that these beds are of Upper 

 Maentwrog age. 



