674 MR. J. E. MAER AIS^D DE. H. A. NICHOLSON 



of the Upper Skelgill group exposed at the Lower Bridge. "We 

 find here 10 feet of blue mudstones, in which we have obtained at 

 this point only a few badl)' preserved Ostracods. The Browgill Beds 

 occur on the moorland at the Lower Bridge, just above these mud- 

 stones, but the actual junction is not seen. The junction is obser- 

 vable, however, at two or three points along the moorland portion 

 of the gill, and the beds are seen to pass with considerable rapidity 

 into the Browgill Beds, Their thickness there is also 10 feet, so that 

 it is evident that the whole thickness is seen at the Lower Bridge. 

 We have searched in vain for other fossils, but found none in this 

 section ; but as a remarkable Acidaspis occurs upon this horizon in 

 another locality, we term these beds the Zone of Acidaspis erinaceus. 



To sum up the results obtained from an examination of the 

 Upper Skelgill Beds : — 



(i) They are conformable to the Middle Skelgill Beds below, and 

 pass up into the Browgill Beds above without the intervention of 

 any Graptolitic shales. 



(ii) They are divisible into two Graptolitic bands, each succeeded 

 by a baud of blue mudstones, viz. : — 



(1) A band of black and blue thinly laminated shales, one foot 

 thick, with abundance of Monograptus Clingani, Can. i —M.-Clin- 

 gani Band. 



(2) A deposit of blue mudstones, 4 feet 6 inches thick, with many 

 Trilobites, including Ampyx aloniensis, n. sp. : ^Ampyx-aloniensis 

 Zone. 



(3) A set of Graptolitic shales of various colours from black to 

 deep orange, 3 feet 6 inches thick, and from the abundance of 

 Monograptus spinigerus^ I^ich., therein, termed the Zone of Mono- 

 graptus spinigerus. 



(4) A thick group of bedded blue mudstones (10 feet thick) con- 

 taining few fossils, and passing up into the BrowgiU Beds above : 

 = Acidaspis-erinaceus Zone. 



The section (fig. 1, p. 661) shows the succession of the SkelgiU 

 Beds at Skelgill, and may be taken as representing the section at the 

 Lower Bridge, some feet being added to the top of the D.-confertus 

 zone and to the base of the M.-fimhriatus zone to show the maximum 

 thicknesses of these beds, as far as seen in the gill. 



B. The Browgill Beds of Browgill a7id Stockdale. 



Some ten miles north of Kendal the river flowing from the north 

 through the little valley of Stockdale joins the main valley of Long 

 Sleddale on the east side of the latter. About fifteen chains above 

 the junction of the two streams, the cluster of houses forming the 

 little hamlet of Stockdale is grouped on the right bank of the 

 Stockdale Beck. Close to the stream, and on its north bank, a 

 quarry is excavated in the Lower Coniston (Brathay) Flags, close 

 to the base of the latter, which here as elsewhere contains 

 Graptolites in an excellent state of preservation. Among these are 

 Monograptus priodon, Bronn, M. vomerinus, Kich., Cyrtograptus 



