^®^' 57'] IGNEOUS EOCKS OT THE TOETWORTH INLIEE. 275 



(c) The Damery, Mickle-Wood, and Middle-Mill Exposures. 



These exposures seem to lie on the lower of the two main 

 trappean horizons. 



There are two small isolated occurrences of trap in the fields east 

 and west of Whitehall Villa, which lies a short distance along the 

 road leading from Damery to Charfield Mills. They show a com- 

 pact, non-amygdaloidal, but much weathered rock. Their relation 

 to the sedimentary beds is nowhere seen, and their connection with 

 the general trend of the exposures a little farther west cannot be 

 ascertained. 



In some respects the most important exposure of igneous rock in 

 this district is that of the large quarry at Damery Bridge. The 

 main part of this quarry is excavated in a compact, reddish, tough 

 rock which is used for road-metal. In parts, and especially near 

 the base and top of the inclined band, the rock is highly amygda- 

 loidal, and in many places contains numerous fragments of baked 

 shale. The amygdules are of calcite or chlorite, or both. "Where 

 these contents have weathered out, for example in fragments which 

 have long been exposed on the surface, the structure is exceed- 

 ingly vesicular. 



At the top south-western corner of the quarry fairly compact trap 

 is seen, resting on red micaceous shales in which Lingula Symondsi 

 has been found in considerable numbers. The shale dips at 35° south 

 20° east, and between it and the more compact rock is a w^eathered, 

 shattered, and more vesicular bed. In the extreme western part of 

 this exposure a fault, with a throw of a few feet, is seen bringing the 

 shale against the igneous rock. The general trend of the trap- 

 band in the quarry is approximately parallel to the strike of the 

 red shales. 



The relation of the sedimentary beds to the upper surface of the 

 trap is not seen in the quarry. Sandstone, however, occurs in 

 the banks of the stream near Damery Bridge, and farther south, 

 on the other side of the stream, is a small excavation beneath a 

 cottage to the east of the road. The section here exposed shows 

 the following beds, dipping 30° southward : — 



Inches. 



Sandy limestone, highly fossiliferous 4 



Shaly parting ^ 



Sandstone, becoming calcareous and highly fossiliferous 

 below, the fossils being mainly converted into peroxide 



of iron 24 



Shaly parting 3 



False-bedded flaggy strata 5 



Shaly parting 3 



Sandstone , 2 



Shale 2 



Hard sandstone, with two highly fossihferous calcareous 



bands , 24 



Shale t) 



Sandstone 4 



Shale 1^ 



Sandstone down to the base of the exposure. 



