322 



C. LAPWORTH ON THE MOFFAT 8EEIES. 



Fig. 30. — Vertical Section VI. Upper Birkhill Shale (DobV 



Linn). 



Flagstones and greywackes of the G-ala 

 group 



C&3. Zone of Rastkites maximus. 

 Grey flaggy shales, 15ft. (curtailed)... 



Grey flags 



Soft black- shale seam, weathering 



yellow-edged 



Grey flaggy shale 



S earn of hard flaggy black shale 



White-clay seam 



Soft black pyritous shale, concre- 

 tionary 



White clay, with calcareous nodules... 



Grey flaggy shales, seams of white 

 clay with concretions, and scattered 

 lines of dark carbonaceous and pyri- 

 tous mudstone 



^ Thin line of hard black slaty shale ... 



( Ob?. Zcmeo/MONOGKAPTUS 

 SPINIG-EKUS. 

 Soft saudy shales, with rough or reti- 

 culated surface 



No fossils. 



3 ft. 



Hard black shale 



Soft sandy pale shale |= 



Hard flaggy black shale, with cuboidal 

 fracture 



Bed of soft highly pyritous black 

 shale 



Hard bands of black shale, parted by 

 lines of white clay 



Rusty brown shivery or splintery shales 



Rastrites maximus, Monograptus Haiti. 

 lft. 



Rastrites maximus, M. Balli, M. spini- 

 gerus, M. Bisingeri> Diplograptus 

 JSughesi, &c. in partial relief. 



Few fossils. 



Soft slaty shales, with greyish-brown 

 or indigo-coloured surface 



Band of black shale ....... 



White clay, with nodules , 

 Black shale 



Grey shales, with seams of white clay. 



Cb\ Zone of DiplogkAPTUS 



COMETA. 



Soft flaky aluminiferous black shales... 



Conspicuous seam of white clay (con- 

 cretions) 



Monograptus spinigerus, M. Bisingeri, 

 M. intermedins. 



Monograptus tenuis, Diplograptus 



Bughesi. 

 Crowded with Monograptus spinigerus, 



Monograptus Bisingeri, &c. 



Monograptus spinigerus, M. Bisingeri, 

 M. tenuis, Diplograptus simiatus, D. 

 tamariscus, D. folium, &c. 



Seam covered with trails of Annelides 

 &c. 



Fossils numerous and well preserved : 

 Monograptus Clingani, M. crenularis, 

 Rastrites hybridus, Diplograptus 



Diplograptus cometa, D. tamariseus f 

 Monograptus lobiferus, M. cyphus, &c. 



(Continued from Vertical Section V.) 



