692 ME. J. E. MAER AND DK. H. A. NICHOLSON 



a mode of occurrence somewhat unusual among the shales of this 

 zone. The fossils are : — 



Monograptus spinigerus, Nich. 



crassus, Lapw. 



jaculum, Lapw, 



Monograptus lobiferus, M'Coy. 

 Diplograptus tainariscus, ISich. 

 Peialograptus palmeus, JBarr. 



Ac 4. These shales pass up into the mudstones of the Aeidaspis- 

 erinacevs zone. These are seen on the right hank of the heck, just 

 above a wall, and bend round so as to occur with a slightly diffe- 

 rent strike on the left bank. They are 10 feet thick, and contain 

 two bands of calcareous nodules near the centre, separated by about 

 a foot of mudstone. Fossils are common between these nodular 

 bands, and we have obtained here 



Lindstroemia, sp. I Phacops elegans, Boeck ^ Sars. 



Acidaspis erinaceus, n. sp. | Leptana quinquecostata, M'Coy. 



AU these forms are found abundantly, the Acidaspis usually in 

 fragments, and perfect specimens are rare. These erinac^ws-beds 

 are shifted to the north-west for a distance of about ten paces by 

 the dip-fault, and there come down to the stream, as the fault has 

 now entered the bed of the stream. 



The beds of the last zone pass up into the pale shales of the 

 Browgill group, and there is a tolerably complete section of this 

 group to the base of the Coniston Flags ; but as the beds are much 

 disturbed exact measurement is impossible. We find the following 

 development of these beds : — 



Ba 1. Fifteen or twenty feet of ordinary pale shale, surmounted 

 by a thin seam of hard grey shale one inch thick, in which we ob- 

 tained Monograptus turriculatus, Earr., in a bad state of preserva- 

 tion : but this is sufficient to show that these beds belong to the 

 turricidatus-zone. 



Ba 2. About 10 feet of pale shale, surmounted by 20 feet of 

 black shales interstratified with pale bands, as is usual in the 

 ms^jMs-zone, and specimens of Monograptus crispus occurred here. 

 About 20 feet of pale shale come on above this. These are the beds 

 of the crispus-zonQ. 



B6 1. A pale band with calcareous nodules 2 or 3 feet thick, 

 forming as usual the base of the Upper Browgill Beds. 



B6 2. These uppermost beds of the Browgill group are less stained 

 than usual, being mostly green, and contain the hard fine-grained 

 grit-beds. Over 100 feet of these beds seem to be developed, so 

 that the Browgill Beds in this section are about 200 feet in thick- 

 ness. They pass up in the ordinary way into the Brathay Flags, 

 below a waterfall. This and the section at Stockdale are the only 

 two sections along the main line of outcrop which afford a fairly 

 complete exhibition of the whole of the Browgill Beds. 



