BERRY PARK SLATES, ETC. 1 35 



also occur in the beds, which here are overlaid in apparent 

 conformity by the Culm-measures.^ In the red clay-slate of Saltern 

 Cove, south of Paignton, Mr. Lee has obtained Goni'atttes (six 

 species), Cardiola retrostriata, Pleurotomaria iu7i)inia, Orlhnceras 

 Schlotheimi, etc.- The beds at Lower Dunscombe and Saltern 

 Cove are grouped by Dr. Roemer as representing the Goniatiles 

 intumescens stage, beneath the Clymenia stage. 



If we regard the Great Devon Limestone as remnants of a Coral- 

 reef, it might be expected, as Mr. Ussher suggests, to present 

 abrupt natural terminations.^ Near Newton Abbot, however, the 

 frequently abrupt terminations of the limestone are due to well- 

 marked faults. This is also conspicuously the case with the 

 Chudleigh Limestone, which, although regarded by Mr. Austen 

 as belonging to "the slate and calcareous system" of South 

 Devon, was, owing to its apparent intercalation in the Culm- 

 measures, placed with that group on the Geological Survey Map. 

 De la Beche indeed admitted the difficulties in the way of such a 

 grouping ; and IMr. Clement Reid has since traced the fault. 



Berry Park and Dartmoutli Slates, and Ashprington Series. 



Ashpfingion Series. — This series, so named by Mr. Champer- 

 nowne from the village of Ashprington, south-east of Totnes, 

 comprises porphyritic and amygdaloidal diabase and tuffs inter- 

 stratified with slates; and has a thickness of about iioo feet, at 

 Greenway Hill, on the Dart. The great development of tuffs is 

 probably local. On the whole, this diabase series is largely made 

 up of slaty volcanic rocks, much resembling the Nassau Schalstein 

 (shale stone). The soil, which is usually red, supports some of the 

 best arable- and grass-land of the South Hams. 



Ramsleigh Limestone. — This division occurs above the main mass 

 of limestone at East Ogwell, near Newton Abbot, being separated 

 from it by ash-beds and slate. Mr. Champernowne states that the 

 Ramsleigh rock is the only striking instance of a " Frasnian " * 

 reef in Devonshire ; the parallel being maintained even to the large 

 infiltration-veins of calcite simulating • organisms {^^ Stromatactis" 

 of M. Dupont). This limestone contains RJiynclionella aiboides, 

 Acervularia pentagona, Chonophyllian, etc. Calcareous bands occur 

 on a similar horizon in other parts of the district, near Dartington 

 and Littlehempston. 



Dartmouth Slates. — These beds, taking their name from their 

 development at Dartmouth, consist of greenish slates, having much 

 the same characters as the Morte Slates, with which they were 

 originally classed by Sedgwick, who used the term Dartmouth 



1 See C. Reid, and A. Champernowne, G. Mag. 1880, pp. 286, 381 ; and 

 Dr. H. B. Holl, Q.J. xxiv. 413. 



- G. Mag. 1877, p. loi. 3 Pioc. Geol. Assoc, viii. 444. 



* A division made by tlie Belgian geologists, from Frasne. 



