Vol. 68.] PAL^.OZ0IC EOCKS OF THE KILBRIDE PENIXSIJLA. 85 



of very hard white grits, occasionally containing quartz-pebbles. 

 The beds are readily recognized in the field. They are overlain 

 by flaggy sandstones which are sometimes seen, where weathered, 

 to be highly fossiliferous. We obtained the following fossils from 

 exposures north and north-west of the Doon Rock : — 



Lindstrceniia hina Lonscl. j Chonetes striatella Dalm. 

 L. suhdiiplicata\2LY. crenulata IMCoy. Fentamerus ohlongus Sow. 



Pal(socyclus preacutus (?) Lonsd. I Coelosjnra hemispherica Sow. 



Streptdasma elongatum Phill. Illcenus harrlensis Mui-cb. 



Cyathophi/Uum (?) sp. /. onaccaUumi Salt. 



Heliolites hiterstinctus Linn. Phacops elegans Sars & Boeck. 



Favosites aspcra d'Orb. Calymenc hlumenhachi (1) Brongn. 



F. forhesi (!) M.-Edw. ! Encnnunis jmjictatics'Brimn. 



Anlopora sp. \ Proetus latffrons (?) M'Coy. 



Orthis ccdUyramma Dahn. Beynclda Idxdeni (?) M'Coy. 



0. rustlca var. Sow. Tenfaculites anglicus Salt. 



0. crassa Lindstr. Ctenodonta anglica d'Orb. 



0. deganfida Dahn. Horiostoma glohosum Sow. 



0. equivalvis (?) Dav. Loxonevia sp. 



Leptcsna rhorahoidcdis Wilck. Orthoceras (?) sp. 

 CamarotcBchia llandoverlana (?) Dav. Crinoid stem-joints, 

 C. strkklandi (?) Sow. 



EncrintD-us piuwtatus is locally very abundant. 



The grits pass up into the Pinny School Beds (4). 



(4) The Einny School Beds — Calcareous Flags. 



These highly fossiliferous beds form one of the most interesting- 

 features of the Silurian development, not only in the Kilbride 

 Peninsula, but throughout the country immediately soutb-w^st 

 and west of Lough Mask. They are dark-grey fissile flags, mn.di 

 used for building purposes, and are frequentlj^ quarried. In rhe 

 Xilbride Peninsula their outcrop extends in an east-north-easterly 

 direction from near Pinny School to a point north of the Doon 

 Rock, and then north-north-eastwards over the shoulder of Pox 

 Hill and down to the shore of Derry Bay. They include two 

 profusely fossiliferous horizons. The lower one is crowded with 

 corals, such as Favosites, Hahjsites, Heliolites., and Lindstr cemia, 

 which often cover large slabs of rock and present a remarkable 

 appearance. These beds are well seen at many points, as on 

 the north and west of the Doon Rock, and at a small pro- 

 montory east of Ivnocknamuck. In some cases the massive 

 corals are enclosed in calcareous concretions, and this probably 

 was formerly the case with them all ; but, as a rule, the rock 

 has been almost completely decalcified. At a somewhat higher 

 level is the second highly-fossiliferous horizon, a bed crowded Avith 

 brachiopods, chiefly Orthis ccdligramma, which occurs in innumer- 

 able large and singularly perfect specimens. This bed is well 

 exposed near the northern shore-line, a short distance east of the 

 outcrop of the coral-bed. The complete list of fossils from the 

 Pinny School Beds is as follows ; — 



