part 3] SILURIAN ROCKS OF THE CLUN-FOJttEST DISTRICT. 239 



(3) South-eastern Margin oP the Chin Outlier. 



(a) Valley north-east of New Invention. — In a small quarry 

 immediately above the farm Lower Ohonetes Beds, succeeded by 

 flaggy Upper Ohonetes Beds, are exposed. Higher up the valley 

 the latter become greenish and more rubblv. and contain a few thin 

 bands of harder greenish flagstones. These beds are followed by 

 Platyscliisma Shales of considerable thickness. Above these comes 

 a thin representative of the Downton Sandstone, which is overlain 

 by very micaceous green sandstone (Temeside Shales) passing 

 upwards into concretionary green marl. The exposures along the 

 valley are scattered, and only the general succession can be 

 followed. 



(b) Valley near Menutton. — The Chonetes Beds are exposed in 

 several places in the lower part of this valley. About 200 yards 

 north of Menutton, on the left as one ascends the valley, is a small 

 quarry with the following succession : — 



C Flags with wavy surface +6 feet. 



Upper Chonetes Beds. < Soft micaceous shales 6 inches. 



[_ Hard, blue, well-bedded flags 9 feet. 



Lower Chonetes Beds. Irregularly-bedded flagstones seen for 3 feet. 



The quarry is of interest, as showing one of the thin bands of 

 soft shale that occur at various horizons in the Chonetes Beds. A 

 similar band is generally found in the Ludlow district a few inches 

 below the Bone-Bed. 



Above the quarry the greenish tyipe of Upper Chonetes Beds can 

 be traced, and immediately above the cottages marked Cwm Hall 

 on the 6-inch map, silvery Platyschisma Shales are seen. 



Concretionary green marl (Temeside Shales) is exposed near the 

 source of the stream. 



(4) Other Sections of Interest. 



Quarry in the Bedlake Valley, about a mile north-west of 

 Bucknell. — This quarry shows the junction of the Rhynchonella 

 and Chonetes Beds. The dip is about 15° north-westwards, and in 

 the deeper south-western portion of the quarry typical Hhynchonella 

 Beds, containing very few fossils, are exposed. About half-way up 

 the face of the quarry a 1-foot band of hard, massive, blue flagstone 

 can be seen. This band approximately marks the upper limit of 

 the jRhi/nchonella Beds. About this horizon and in the northern 

 part of the quarry there are more irregularly-bedded rocks 

 containing Chonetes striatella, Orthis, and other fossils which 

 indicate the base of the Chonetes Beds. 



V. Tectonics. 



The principal axis of folding in the district has a Caledonian 

 trend, and strikes north-north-east and south-south-west. It is 

 parallel both to the great Church-Stretton Fault and to the minor 



