122 EEPORTS ON THE STATE OF SCIENCE. — 1915. 



BiUingsella lindstrcemi var. salopiensis Matleji very plentiful, Acrothele 

 cortacea Linnarsson, Acrotreta, of. sagittalis Salter, A. Schmalense'ei 



Walcott, Obolus (?) sp. index Linnarsson (1876). ft. in. 



n,. Shale with sandy bands 3 



a,. Hard, micaceous, and siUceous grit 6 



«._,. Flaggy, micaceous shale 2 



a^. Hard, flaggy, siliceous and micaceous grit 10 



Shaly material 3 



East End of the Section. 



The shale and bands of grit of this section have a very strong resem- 

 blance to those of Excavation No. 21, the lower section on the Shoot 

 Kough Road, and the BiUingsella occurs in the same state of preservation 

 and in the same profusion. The only differences observed in the section 

 are : (1) the comparative thinness of this bed, and (2) the absence of rotten- 

 stone bands (representing calcareous bands) above the BiUingsella grit 

 in this new section in Caradoc Dingle. 



The shales, b, are consequently regarded as equivalent to the Shoot 

 Rough Road shales (the Orusia lenticularis horizon) and the flaggy beds, 

 a, as equivalent to the upper portion of the Shoot Rough Road Flags. All 

 the fossils identified from the Billingsella-lo&nd aj are found in Scandinavia 

 in the Paradoxides forchammei'i zone. 



Excavation No. 58. — South-west Slope of Little Caradoc. 

 In the hope of finding sections comparable with those of Excavations 

 Nos. 4 and 53, some preliminary trial-holes (3 feet or more long and about 

 the same depth) were made where the Quartzite crops out in the little 

 gully between the Caer Caradoc Hill and Little Caradoc. These showed 

 that the ground here is intensely faulted and that no continuous section is 

 to be hoped for. Quartzite, flaggy beds, and green sandstones occur in 

 the various trial-holes without any orderly arrangement being apparent. 

 The surfaces of the flaggy beds in one place showed tracks of organisms, 

 similar to those found in Excavation No. 41, south-west of Hill House,^ 

 but there was no evidence to show whether the beds should be regarded 

 as within the Quartzite sequence or as belonging to the Lower Comley 

 Sandstone. 



Excavation No. 59. — In Comley Brook about 50 Yards North 

 of the Shoot Rough Road. 



A rib of mudstone crossing the bed of the Comley Brook, from which 

 fossils were collected by Mr. Manson, of H.M. Geological Survey, during 

 the summer of 1914, has been laid bare by excavation, and the following 

 forms obtained : — 



Orusia lenticularis Wahlenberg sp. 



Acrothele ? fragments. 



Trilobite fragments. 



The mudstone occurs as a band about 12 inches thick in shales re- 

 ferred provisionally to the Shoot Rough Road shales. The strike is 

 approximately north-east and south-west, and the dip vertical. The 

 Trilobite fragments are not sufficiently complete for exact determination, 

 but may be said to be reminiscent of Olenus, sensu lato. A block or nodule 

 of similar rock, with the Orusia very well preserved, was found some 



'■' Rep. Brit. Assoc. 1911, Portsmouth (1912), p. 113. 



