THE CROSS FKLL INLIER. 505 



the series the " Corona Series.'' The fossils contained in the series 

 arc of great interest, and altogetlier different from those embedded 

 in the overlying strata. AN'e append a list of those which have been 

 found in the stratum in this stream : — 



Beyr'ichia Wilckenaiana., Jones. 

 Pinmitia semicircular is ^ Jones and Holl. 

 Lingnla tenuifjrainihtUi^ M'Coy. 

 Strophomena fjramUs, Sow. 



The series (4) consists mainly of black and blue shales, often 

 calcareous, intorstratified with bands of calcareous rock which have 

 undergone considerable disturbance. These are the well-known 

 Ihifton JShales. Their fauna is (juite similar to that of the main 

 division of the Coniston Limestone of the Lake District, so that 

 whether we suppose that this is a more specially shaly base of the 

 Coniston Limestone series, or an argillaceous representative of the 

 whole of that series, we are fully persuaded that these Dufton 

 Shales are of the age of the Coniston Limestone, and not an under- 

 lying deposit as has been previousl)- asserted. We have found in 

 the Dufton Shales of this stream the undermentioned fossils : — 



DiceJlograittus complanatus, Lapw. (?). 

 Diplograptus socialis, Lapw. (?). 

 Cahjmene senaria, Conr. 

 Cyhele verrucosa, Dalm, 

 Illcenus Bowmanni, Salt. 

 Pliacops Bro/igniartii, Portl. 

 Remopleiirides Colbii, Portl. 



At the point where a tributary stream (Kundale Beck) enters 

 Swindale from the east, the Dufton Shales are succeeded by a very 

 calcareous deposit, numbered 5 in the section. This consists of thick 

 beds of whitish limestone with peculiar ashy-looking green shales. 

 Though this deposit at first sight bears far stronger resemblance to 

 The ordinary Coniston Limestone than do the Dufton Shales, an 

 examination of the fossils indicates clearly that it is not Coniston 

 Limestone, but is the equivalent of a thin band at the base of the 

 Ashgill Shales in the Lake District, which one of us has previously 

 referred to (Quart. Journ. Geol. Soc. vol. xli. (1885) p. 487) as 

 the " Staurocephahis zone." We may speak of this limestone as 

 The " Stavroceplialus Limestone " ; in Swindale it has yielded the 

 following fossils, which are mostly found in the interstratified 

 calcareous green shales : — 



Ecliinosplicerites arachnoidtus, Forbes. 



Turrilepas. 



Acidaspis. 



Illceims Bowmanni , Salt. 



Lichas laciniatiis, Wahl. 



Fhacops Jukesii, Salt. 



Phillipsinella p)arahoLa, Barr. (?). 



Staurocep)hcd((s glohiceps^ Portl. 



