KiNAHAN AND Baily — Repovt Oil Eocks, 8fC. 475 



LXX. — Eepoet on the Rocks of the Fintona aito Cuelew IIotjntaiit 

 DisTEiCTs. By Gr. H. Etnaean, M.E.I. a., with Palseontological 

 Eemarks by W. H. Baiit, F.G.S. (With Plates XVI. and XYII.) 



[Eead, April 12, 1880.] 



I]!TTEODUCIIOIS", 



The committee commenced operations in the neighbourhood of Pome- 

 roy, and worked south-westwards to Lisbellaw, Dmmshambo, Boyle, 

 and BaUaghaderreen ; while, for comparison, a traverse was made of 

 the rocks in the Croaghmoyle, Toormakeady, Clew Bay, and Killary 

 Bay districts. 



As the fossils are an important element in the inquiry, on account 

 of the occurrence of an assemblage of English Cambro- Silurian fomis at 

 certain places in the Irish Silurians, a list of those recorded from dif- 

 ferent areas is given in a tabular form, whereby those common to the 

 different localities can be seen at a glance. 



The report is divided into three parts : — First. A discussion of the 

 Pomeroy and Lisbellaw fossiliferous rocks. Second. A Table of the 

 Cambro- Silurian fossils found at Pomeroy and Lisbellaw, with those 

 found in the different Irish Silurian tracts. Third. A discussion of 

 the Silurian rocks, commonly called ''Lower Old Eed Sandstone," of 

 Tyrone, Fermanagh, and the Curlew Mountains, with their relations 

 to the Silurians of S."W. Mayo and N-W. Galway. 



PAET l.—{In Abstract.) 



FoSSrLIEEEOIJS EOCKS IK THE NeIGHBOUEHOOD OE PoMEEOT. 



Near Pomeroy are three distinct groups of rocks (neglecting the 

 Carboniferous), namely — 



Eed, purple, and greenish sandstones, con- \ 



glomerates, and sandy shales, with inter- j " Lowee Old 

 stratified masses of eurite (basic felstone), I Eed Sandstone" 

 tuff, breccia, and, in places, green shales \ (Silurian). 

 and limestone. 



Green, grey, and bluish shales, slates, and 



grits ; a few of the latter being quartzose j p 

 and conglomeritic, while some of the omee 



shales are calciferous, and many of them 

 fossiliferous. 



Seeies. 



, [ Metamorphic sedimentary and eruptive ) Aeenig 



( rocks, with intrusions of granite, &c. ) Geoup. 



E.I.A. PROC, see. II. VOL. III. — SCIENCE. 2 B 



