C. LAPWOETH ON THE MOFFAT SERIES. 273 



In the prolongation of the strike to the south-west we reach a 

 second score, which affords a section completely verifying our view 



Fig. 10. — Rishinhope Burn. (Generalized Section.) 



B. Flagstones and greywackes, con- 

 torted. 

 /. Cb. Grey shales with black and while 



/ ^E. seams. 



3. Horizon of Bastrites maximus. 

 2. Pyritous shales with Mono- 

 graptus spinigerus &c. 

 Ca. Black flaggy shales visible in large 



Ca "^pA/ISllJIk i !{$JHk WjSf anticlinal in lower portion of 



'^//aMI M JlliilP the gorge 



B. (1) G-rey and green mudstones. 

 B llv ''/P, ;Iw (2) Soft black shales with Bicel- 



jj 3 * Co ^ lograptus anceps, seen in scores 



above the head of the burn. 

 /. Fault. 



of the attitude and sequence of the beds. The strata exposed all 

 dip steadily to the southward at about 60°, in the following (de- 

 scending) order : — 



(c) Steep cliff formed of the hard flags and shales of the D.- 

 vesiculosus and lower M.-gregarius bands, yielding D. 

 vesiculosus, M. gregarius, M. attenuatus, &c 30 feet. 



(b) Soft grey and green mudstones with black bands (clearly 



the zone of Dicellograptus anceps, &c.) 20 feet. 



(a) Soft shivery barren mudstones, grey and green 20 feet. 



Above the section the scattered fragments of shale lying on the 

 hill-slope prove the presence of the grey and white-lined Upper 

 Birkhill Shales at this point. The summit of the ridge is formed by 

 the greywackes of the country. 



The Yellow Mire. — Following the line of depression marking the 

 place of the Black Band over the little watershed, we reach a broad 

 peat-clad hollow, drained by several small feeders of the Muckra 

 Burn. This hollow owes its origin to the extraordinary expansion 

 of the band of easily eroded black shales at this locality, where its 

 maximum diameter probably exceeds a quarter of a mile. The 

 yellow and iron-stained fragments of the " Barren Mudstones " and 

 the overlying shales are exposed here and there along the courses 

 of all the little rills that wander through the moss, giving to the 

 spot its quaint but characteristic title of the Yellow Mire. 



Along the northern margin of the band lie the Birkhill Shales. 

 The upper and greyer division of the group is alone exposed. Its 

 strata are much contorted, but are comparatively unaltered. They 

 contain in abundance the characteristic fossils of the R. -maximus 

 zone, which are found in good preservation in the grey shales im- 

 mediately in contact with the greywackes at the point where the 

 eastern arm of the Muckra Burn emerges from the moss. 



None of the forms proper to the Lower Birkhill Shales are obtain- 

 able, the inferior portion of the Birkhill group being apparently 

 represented, in part, by a thin and excessively crumpled band of dark 



