Vol. 55.] CONGLOMEKATES OF THE LOWER SEVERN BASIN. 103 



In the Enville district the whole of the Middle Permian sequence 

 is exposed from base to summit, and also the whole of the (Jpper 

 Permian so far as known. 



The Middle Permian is made up of three persistent calcareous 

 bands, each capped by a series of sandstones (usually non-calcareous) 

 and marls. These three calcareous bands maybe distinguished as 

 A\ B\ & C^ respectively in ascending order, and the softer beds 

 overlying each as A'^, W, & C^ respectively. 



The Upper Permian of the Enville district commences with a 

 massive breccia, the so-called trappoid breccia, which will be 

 distinguished as D^ This is succeeded by a considerable thickness 

 of marls with one persistent band of breccia, and others of a more 

 or less inconstant character : these marls and intercalated breccias 

 will be collectively distinguished as D^. 



The Middle Permian of the Enville District. 



Band A\ — The basal band of the Middle Permian is best exposed 

 immediately south-west of Tuckhill, at Boathole, and is marked 

 by a low ridge along the whole of its course. It is more or less a 

 calcareous sandstone throughout, and at Boathole is developed as a 

 cornstone. It is 10 feet thick in the south-eastern part of the district 

 near No Man's Green, retains the same thickness to beyond Tuckhill, 

 two-thirds of its length, but increases to 20 feet near Broad Oak Hill 

 at the north-western termination of the area. 



Band A^. — The overlying marls and sandstones are first seen at 

 No Man's Green, where they are 50 feet thick. They maintain 

 about the same thickness (50 to 75 feet) throughout, but become 

 collectively more sandy towards the N.N.W. At the north-western 

 extremity of the area the greater part of this zone is a sandstone. 



Band B\ — The middle calcareous band is first seen at Compton. 

 Here it is a massive conglomerate, 75 feet thick, intensely hard and 

 compact. The largest pebble that I have found in it is 6 inches 

 long, and many are 4 inches. Half a mile to the westward (at Birch 

 Wood) the calcareous conglomerate splits into two bands, divided by 

 sandstones (well seen at No Man's Green), and the pebbles are far 

 less frequent and smaller. A mile beyond Birch Wood, near 

 Chidley's Earm, the two bands become three, separated by sand- 

 stones and some marl, and the collective thickness has grown from 

 75 to 155 feet, or it has more than doubled. The highest band is 

 most conglomeratic. The pebbles near Chidley's Earm are more 

 abundant and larger than at No Man's Green, while they are of 

 about the same size as at Compton to the south, but less abundant. 

 Half a mile north of Chidley's Earm there is a fault, and in all 

 the area to the north-north-west of this fault pebbles are rare in 

 band B\ Half a mile north of the fault the three bands have 

 come together again near Tuckhill, and form a magnificent ridge. 

 The fine exposures which exist at and near Tuckhill exhibit 

 about 10 feet of cornstone at the base, 60 feet of red calcareous 

 sandstone, and an upper zone (say 5 feet) of conglomerate. The 



