626 DR. G. J. HINDE AND 31R. HOWARD FOX ON [Nov. 1895, 



(i) Chudleigh District, Devon. 



To the right of the main road leading from Chudleigh Station to 

 the town, radiolarian rocks are met with in the grounds north of 

 Lawell House. A section of not more than 10 feet in thickness is 

 here shown by the side of a hedge ; the beds dip 20° N.N'.W. 

 They consist of a dark, hard, compact and brittle siliceous rock, in 

 which there is a small proportion of lime. The rock weathers on the 

 exterior to a dark rottenstone. Radiolaria are fairly numerous and 

 with them are some detached spicules of hexactinellid sponges. We 

 are indebted to Mr. Ussher for directing us to the chert-beds at 

 this place ; he states l that they occur in faulted association with 

 their surroundings. 



At Winstow Cottage, the lodge at the western entrance to 

 Ugbrooke Park, about 5 mile south of Lawell House hedge-section, 

 there is a small quarry showing nearly vertical beds of dark or 

 brownish siliceous rocks of a shaly character, also containing a 

 small quantity of lime. Thin sections show radiolaria and sponge- 

 spicules, and in addition there are fragments of trilobites and 

 crinoid-stems. 



Another exposure of radiolarian rocks, for the particulars of 

 which we are indebted to Mr. A. Soniervail, of Torquay, occurs 

 about 4 miles north by wesc of Chudleigh Railway-station, in a 

 cutting just north of Ashton Station. Beds of dark, hard, brittle 

 chert are here shown from 15 to 20 feet in thickness. Hand- 

 specimens of the rock forwarded to us are crowded with radiolaria, 

 which can be seen with a lens. Microscopic sections show that 

 they are only casts, for the most part filled with cryptocrystalline 

 silica, but in some cases with chalcedonic silica. Mr. Ussher has 

 pointed out 2 that cherty kieselschiefer occurs as an inlier of the 

 Codden Hill Beds at Lea Cross, somewhat north of the present 

 locality. 



We have not examined further exposures of the radiolarian rocks 

 in the district between Ramshorn Down and Chudleigh, but the 

 road-material largely used in this neighbourhood consists of a hard, 

 white or light radiolarian rock, closely similar in appearance to the 

 Codden Hill Beds — thus showing that not only the dark kinds but 

 the lighter varieties also are developed in the neighbourhood. 



(k) Bishopsteignton, near Teignmouth, S.E. Devon. 



Mr. Ussher informed us of the occurrence of a few beds of chert 

 belonging to the basal Culm Measures, exposed in a rugged by-lane 

 near the eastern end of the village of Bishopsteiguton. The 

 specimens of this chert which he has forwarded to us are of a light 

 bluish tint ; they are traversed by numerous fine reddish cracks, 



1 Proc. Som. Archaeol. & Nat. Hist. Soc. vol. xxxviii. (1892) pp. 103, 142. 



2 Ibid. p. 136. 



