136 DEVONIAN. 



group. ^ They occur over a large part of the area around Kings- 

 bridge. They may represent the entire series between the Great 

 Devon Limestone and the Cockington Beds, but their vertical 

 range is uncertain. 



Berry Park Slafcs. — These slates are so termed by IMr. Champer- 

 nowne from Berry Pomeroy, east of Totnes. They comprise 

 bluish and dark olive-coloured slaty shales, with Streptorhynchus 

 umbraculiim. In some places the Berry Park Slates rest on the 

 Ashprington Series, but in other places the slates appear to 

 represent that series. At Dartington Hall, north of Totnes, the 

 Berry Park Slates are represented by the Upper Dartington Beds, 

 which include volcanic tuffs ; in fact the tuffs pass insensibly into 

 slates. The beds attain a thickness of about 1500 feet. 



UPPER devonian: 

 Cockington Beds. 



These beds, originally described by De la Beche as Old Red 

 Sandstone, consist of reddish-brown micaceous sandstone, purple 

 and grey grits and shales. The name Cockington Beds has been 

 applied by Mr. Champernowne, as the beds are well exposed near 

 the village of Cockington, south-west of Torquay. The beds are 

 exposed in quarries about a quarter of a mile north-east of Liver- 

 mead. Here they are faulted against the Lower Slates and Lime- 

 stone according to Mr. Champernowne, a structure not suspected 

 by the writer, who formerly regarded the Cockington Beds as 

 below these rocks.^ IVIr. Champernowne, however, states that the 

 Berry Park Beds pass up into the Cockington Beds, which form 

 the highest ground between the Dart and Torbay, at Westerland 

 Beacon and Windmill Hill south-west of Collaton Kirkham ; and 

 he estimates their thickness in Windmill Hill at about 1300 feet. 

 Sedgwick, too, was of opinion that the South Devon limestones 

 were overlaid by red sandstones.^ Mr. Champernowne regards the 

 purple sandstones and slates of Cockington, Ockham, etc., as of 

 Upper Devonian age, and the equivalents of the Pickwell Down 

 Sandstones. Hence they may be said to represent the Upper Old 

 Red Sandstone. 



3. PLYMOUTH. 



In the Plymouth district we owe much of our knowledge to the 

 early labours of the Rev. Richard Hennah,^ as well as to Phillips 

 and De la Beche. In recent years ]\Ir. R. N. Worth has done 

 much geological work, and the beds have also been studied by Mr. 



' Q. J. viii. 3. 



- H. B. W., G. Mag. 1877, p. 449. See also De la Beche, Proc. G. S. i. 32 ; 

 and D. Sharpe, Q. J. ix. 26. 



3 Q.J. viii. 3. " T. G. S. V. 619. 



