Dr. WheeUonHind—^Loiver Culm of North Devon. 395- 



show grits and rocks of a Middle Culm type; South there is 

 a hollow parallel with the strike between these grits, the main 

 Coddon Hill range, which I think indicates the Black limestone 

 of Venn, and immediately south is the Coddon Hill range. This 

 would make the succession — 



Middle Culm grits. 

 Posidonomya beds. 

 Coddou Hill beds. 



Unfortunately no limestones have been worked in the hollow south 

 of the Middle Culm, although the depression which exists parallel 

 to and between the Coddon Hill Beds and Middle Culm grits seems 

 to indicate calcareous beds. 



There is no doubt that the dips taken in various quarries show 

 that the beds on the north are dipping south, and those of the main 

 Coddon Hill range dip north. Also the Venn limestones are dipping 

 south at a very high angle, conformable to the Coddon Hill Beds 

 of Venn Cross quarry on the north side of the synclinal. So that 

 in the valley between Venn Cross, where the beds dip south, and 

 Coddon Hill, where the beds dip north, is situated the Venn limestone 

 with Posidonomya Becheri and the Middle Culm grits. Traced east, 

 in the gradually vanishing synclinal, first of all the feature formed 

 by the Middle Culm grits disappears near Hannafoi'd, and in the 

 hollow between this terminating feature and the junction of the two 

 limbs of the Coddon Beds, the Posidonomya limestones crop out rich 

 in fossils and occupying a hollow with beds of Coddon Hill type 

 to the north and south of it. 



East of Swimbridge, from Filleigh to Marsh, are a line of old 

 workings in the Black limestones, but the Coddon Hill Beds 

 become faulted out, so that apparently in turn, first Posidonomya 

 beds and then the Middle Culm beds rest on the Pilton series or 

 Upper Devonian. At Headon, quarries of well-marked Coddon Hill 

 Beds, here associated with much wavellite, are dipping south and 

 are north of the line of the Filleigh limestones, but a little east of 

 North Aller Farm they have disappeared and the limestones are 

 faulted against Pilton Beds. For the next 17 miles eastward 

 Lower Culm beds have been cut off by faults, but near Dulverton 

 Station beds of Coddon Hill type are to be seen having the same 

 strike as at Coddon Hill east and west, dipping almost vertically 

 but with a southerly trend. 



Close to Dulverton Station, near Brushford village, is a quarry in 

 Pilton Beds whence Phillips obtained many of the fossils which he 

 described, and south of this village is Kent's Hill quarry with 

 thin siliceous beds of the Coddon Hill type. About half a mile 

 further east is the Hulverton Hill quarry. This hill has the curious 

 contour which seems to be typical of Coddon Hill Beds elsewhere, 

 and the beds themselves are characteristic. Nowhere are beds of 

 Posidonomya limestone seen between Pilton and Coddon Hill Beds. 

 Still further east, at Ashbrittle, are Coddon Hill Beds, and these 

 are apparently lying on Pilton Beds. 



