SI1UKIAN OF THE LAKE-DISTRICT. 877 



This list is unfortunately very scanty ; for fossils, though abundant 

 in places, are generally much distorted. Strophomena siluriana, so 

 abundant in the Ashgill shales, just comes up into this bed. Meri- 

 stella crassa is a characteristic fossil of the May-Hill group. 



4. Stockdale Shales (Aveline). 



These beds are divided into three subdivisions, distinguishable by 

 lithological character, viz. : — a. Lower, black shales ; b. Middle, 

 Graptolitic mudstones ; c. Upper, pale shales. 



a. The Blade Shales are seen at Spengill, Ashgill, &c. They con- 

 tain few organisms, the only ones I have yet seen being a crinoid 

 and a species of Strophomena from Spengill. 



b. Graptolitic Mudstones (Harkness & Nicholson). — These, as 

 their name implies, are black mudstones fall of Graptolites ; but they 

 contain inters tratifled non-Graptolitiferous flaggy beds, which, in 

 places, as at Skelgill, are thicker than the mudstones themselves. 

 Fossils other than Graptolites have been discovered by Profs. Hark- 

 ness and Nicholson in these beds (Quart. Journ. Geol. Soc. vol. xxxiii. 

 p. 473). The best section of these in the district is seen in Skelgill, 

 at a footbridge near where the 800-feet contour-line crosses the 

 stream, and a few hundred yards N.E. of the farm of High Skelgill. 



The section seen here is given at p. 878 (fig. 1), drawn to true scale. 



Fossils have been obtained from the beds marked P.Z., A.Z., and 

 E.Z., respectively characterized by the occurrence in some abun- 

 dance of a species of Phacojps, Monograptus argenteus, and Encrinurus 

 variolaris. 



The following is a list of fossils other than Graptolites which I 

 have obtained from the Graptolitic Mudstones and their associated 

 flaggy and calcareous beds : — 



Actinozoa. 



Petraia (small species) Spengill; Skelgill (P.Z. & E.Z.). 



Favosites asper ? Skelgill (P.Z.). 



Crustacea. 



Entomostraca Spengill; Skelgill (P.Z. &E.Z.), Torver 



Large phyllopod Skelgill ( A.Z.). [Beck. 



Discinocaris Brovfniana, Woodw Skelgill (A.Z.). 



Peltocaris aptyeboides West side of Long Slecldale. 



. xlcidaspis (resembling species of Upper 

 May-Hill beds, from Penlan, Llan- 

 dovery) Skelgill (E.Z.). 



Aciclaspis Torver Beck. 



Proetus Stokesii ? Skelgill (P.Z. ). 



Harpes Skelgill (P.Z.). 



Cheirurus bimucronatus, Murch Spengill ; Skelgill (P.Z. & E.Z.), 



Phacops (sp. with punctate margin to 



cheeks) Skelgill (P.Z.). 



Phacops (smaller species) . . , Spengill ; Skelgill (P.Z.) ; Torver Beck. 



Encrinurus variolaris, Brong Skelgill (E.Z.). 



Calymene Skelgill (P.Z.). 



Ilkenus Spengill. 



Mollusca. 



Orthis (undeterminable) Skelgill (P.Z.). 



Leptsena quinquecostata, M' Coy Spengill; Skelgill (E.Z.); Torver Beck, 



Orthoceras Skelgill (P.Z., A.Z., & E.Z.). 



