SEDGWICK ON THE MAY HILL SANDSTONE, 215 



Page 112, line 20 from top, /o>^ would have been altogether evolved and vrould not 

 have remained read would not have been altogether evolved 

 and would have remained. 



— 113, — 25 from top, the buckle was said to have been found in a block of 



stone near Hamilton. 



— 117, Diluvial agency. The action of wind on dry sand or snow, and 



of water on submerged earth or sand having similar results in 

 forming hilly surfaces ; we need not refer all the contour phe- 

 nomena of these islands to " diluvial " agency. 



— 118, lines 8-10 from top, The red earth having been now shown to be of 



organic origin, the argument in the text is no longer valid. 



— 119, lines 9, 10 from top. Diluvial action. These phenomena are not neces- 



sarily attributable to diluvial action ; for the upper crust of the 

 caverns may have fallen in on the withdrawal of their contents 

 by the sea, although the then existing connection with the sea 

 may have been since filled up. 



— 120, line 17 from bottom, /or Picton read Pictou. 



— — — 5 from bottom, ybr Mr. Langton's read Mt. Langton. 



— 123, — 4 from top, /or sound read sand. 



Note. — The sand encroachment at Elbow Bay (see Bermuda Memoir, p. 109) 

 has now crossed the hill at certain points. Capt. J. Gordon, R.E., informs the 

 author that it has risen to the height of the chimney of Keel's cottage, and is 

 now in course of swallowing up Mr. Dunscorabe's property. 



On a Proposed Separation of the so-called Caradoc Sand- 

 stone into two distinct Groups; Viz. (1) May Hill Sandstone- 

 (2) Caradoc Sandstone. By the Rev. Professor Sedgwick 

 F.R.S., F.G.S. 



[Read November 3, 1852.] 



In former papers, read during the sessions of the past year, I en- 

 deavoured to show that between Ravenstonedale and Horton in Rib- 

 blesdale, and along an irregular line which runs on the east side of 

 the great Craven fault, the older palaeozoic rocks are based on three 

 distinct groups of strata : (1 .) The Coniston limestone and calcareous 

 slates ; (2.) The Coniston flagstone ; (3.) The Coniston grits. 

 The first two were brought into comparison with the upper part of 

 the Bala series, while the third was considered as the true equivalent 

 of the Caradoc sandstone*. As, however, between Helm's Gill in 

 the valley of Dent, and Thornton Beck near Ingleton, there was an 

 interval of full ten miles in which no distinct traces had been dis- 

 covered of the Coniston limestone and calcareous slates ; I requested 

 my friend John Ruthven carefully to re-examine the country, with a 

 view of discovering some additional traces of the Coniston group 

 (No. 1); and, above all, of collecting fossils, wherever they were to 

 be found, in the hard sterile ridges of the Coniston grits. 



Those who have read the papers, formerly published in our Trans- 

 actions, will have some remembrance of the structure of the valley 

 of Dent. All the higher parts of the valley are composed of nearly 

 horizontal beds of the Carboniferous series crowned by the Millstone 



* Journal of the Geological Society, vol. viii. p. 150, &c. 



