270 C. LAPWOETH ON THE MOFFAT SERIES. 



ferred to, and their lower beds are much broken up along its 

 course. The M.-sjoinigerus zone, however, is easily identified, ex- 

 hibiting the peculiar aluminiferous black shales, with their excess 

 of pyrites, their slightly concretionary structure, and their beauti- 

 fully preserved examples of Monograptus spinigerus (Nich.). The 

 highest or R.-maooimus zone of the Upper-Birkhill Shales is here 

 even more satisfactorily exposed than at Dobb's Linn. Many of the 

 mudstones are of a deep purple colour, but all show the characteristic 

 white and yellow lines and thin seams of dark shales, loaded with 

 Graptolites in a state of high relief. 



These beds pass under the greywackes at a low angle near the 

 head of the score, where the overlying beds are seen to be much 

 thinner and more flag-like than at Dobb's Linn. 



The opposite leg of the chief anticlinal is hidden below the turf : 

 some hardened black shales projecting from the hill-side below pos- 

 sibly belong to it. 



Every fossil of the Birkhill series of our typical section may be 

 collected in the corresponding zones of this locality. Those detected 

 and noted by myself will be found in the lists given in the second 

 part of this Memoir. 



ii. Second or Mishinhope Band. 



Moory SyJce. — The finest section of the deposits included in the 

 second band of the black shales is met with near the eastern ex- 

 tremity of the band. It occurs in the course of the small stream 

 known locally as the Moory Syke, at a point about half a mile to the 

 south of the Thirlstane score (fig. 9). 



Fig. 9. — Section at the head of Moory Syke. 



^rm^77f^^&. 



'■' \efr\ b MS'* 

 JO Cet SZ. J3a. -B6. 



D. Greywackes and flagstones, grey and purple, with partings of flaggy shale. 

 Cb. Grey, purple, and yellow shales, with seams of black mudstones and white- 

 clay lines, containing Rastrites maximus, Monograptus Halli, Diplo- 

 graptus folium, &c. 

 1. Seam of Monograptus Cling am. 2. Horizon of Monograptus spini- 

 gerus. 3. Horizon of Rastrites maximus. 

 Ca. Black carbonaceous flags and shales, with partings of variegated clays, 



containing Diplograptus vesiculosus, Monograptus gregarius, &c. 

 Bb. Pale grey and green non-fossiliferous mudstones. 



# Fossil if erous seam in ditto. 

 Ba. Black slaty flags and shales, with seams of white mudstones in c. 



a. Zone of Pleurograptus. b. Zone of Dicranograptus Clingani. c. Zone 

 of Climacograptus Wilsoni, 

 fff. Faults. 



To the north of the chief exposure at this locality two preliminary 

 anticlinals display a few feet of the grey- shale group, exhibiting the 



