Geological Society. 377 



discovered by them in June last (in company with Mr. James Back- 

 house and son and Mr. Sylvanus Thompson) near the top of the 

 Weddy Bank Fell, about ten miles west of Middleton in Teesdale, 

 and five from the High Force in Durham ; the elevation was about 

 ISOO feet. The locality was confined to a very small space. 



Specimens of Anemone ranunculoides were presented by Mrs. M. 

 Stovin, found ivild in a wood near Worksop, Nottinghamshire. Spe- 

 cimens from this locality were presented in June last ; and in a letter 

 to the Secretary, Mrs. Stovin observes, " the more I see and hear of 

 this plant in the Nottingham station, the more am I convinced of its 

 being wild." 



The concluding portion of Mr. Lees's elaborate paper on the 

 British Fruticose species of Rubus was read, and several specimens 

 and drawings exhibited in illustration of the views contained in the 



GEOLOGICAL SOCIETY. 



Nov. 29, 1843. — Prof. Sedgwick concluded his memoir, " On the 

 Geology of North Wales," read June 21, 1843. 



The author maintains the threefold division of the older rocks. The 

 middle division is now illustrated by more detailed sections, especially 

 through difl^erent parts of the Berwyn chain. The first and principal 

 section is from the porphyries of Arrenig across the Lake of Bala, 

 and over the crest of the Berwyns to Llangynog. The whole of this 

 section is placed in a fossiliferous system, and the thickness of the 

 beds actually associated with fossils is several thousand feet. The 

 diflFerence between this result and one stated by Mr. Sharpe, is ac- 

 counted for, first, by a diff^erent comjmtation of the thickness of cer- 

 tain beds about the position of which there is no doubt, and, secondly, 

 by a difi^erent interpretation of pha?nomena, Mr. Sharpe terminating 

 his section abruptly against a supposed fault, while Professor Sedg- 

 wick makes a regular ascending section, and places in the highest 

 part of the series certain beds which Mr. Sharpe calls Cambrian, and 

 regards as a part of a lower and non-fossiliferous group. In short. 

 Professor Sedgwick extends his section among the fossil groups se- 

 veral miles to the east of the supposed line of fault of Mr. Sharpe. 

 Other sections are described, drawn through the southern part of the 

 Berwyns, which is shown to rest on a great trough formed by the 

 Bala limestone. The author then gives a general and detailed ac- 

 count of the physical structure of the whole Berwyn chain, which 

 measured, on the curved line of the water- shed, is not less than 

 thirty miles long. The whole crest of this chain, with the exception 

 of about five miles, is composed of beds superior to the Bala lime- 

 stone. The author then describes the sections on the east side of 

 the Berwyns, and the section on the Ceiriog and the Dee, which 

 connect the part of the protozoic group, which is the exact equiva- 

 lent of the Caradoc sandstone, with the Denbigh flagstone, which 

 represents the upper Silurian rocks of Mr. Murchison. After dis- 

 cussing the sections in detail he draws the following conclusions : — 

 1. The base of the fossiliferous system is unknown, for beds (occa- 



Ann. ^ Mag. N. Hist. Vol. xiv. 2 C 



