( 93 ) 



IV. 



^'OTES 01^ THE HOMOTAXIAL EQUIYALENTS OE THE 

 BEDS WHICH IMMEDIATELY SUCCEED THE CARBONI- 

 EEROUS LIMESTONE IN THE WEST OF IRELAND. 



By AYHEELTON HIND, M.D., B.S., F.ll.C.S., F.G.S. 



[Plates III.-YI.] 



communicated by peof. g. a. j. cole, f.g.s. 



Read February 27. Ordered for Publication Makch 1. 

 Published May 27, 1905. 



A LAEGE stretch of country in County Clare, County Limerick, and 

 County Kerry, was originally described and mapped as Coal Measures, 

 in the Memoirs of the Geological Survey of Ireland. Later on, 

 unfortunately, the one-inch maps were made to show the succession 

 to be Coal Measures, Millstone Grits, Yoredale rocks, and Carboni- 

 ferous Limestone. 



The object of this Paper is to record the fossils which characterise 

 the different horizons in this series, which measures some 1000 feet in 

 thickness, and which, undoubtedly, lies conformably upon the upper 

 beds of the Carboniferous Limestone. 



Stmcture of the District. — The whole area with which this Paper 

 deals is fortunately very simple in its geological structure, and forms 

 a single, regular basin of the Carboniferous beds, the western portion 

 having been cut away by marine action, and thus exposing cliff 

 sections, which are of grecit value, as they afford practically a 

 complete exposure of the beds which overlie the Carboniferous 

 Limestone. 



On the north the area is bounded by the Carboniferous Limestone 

 of Black Head and the Burren, affording a continuous section of some 

 2000 feet of Carboniferous Limestone, which here consists of a series 

 of limestone beds unbroken by intercalations of shale or sandstone, 

 and not showing any trace of the subdivisions of that series which 

 obtain elsewhere in Ireland. On the east the Burren limestones 

 form the boundary from Kilfenora via Corofin to Enuis ; and the lime- 

 stone is continued south of Ennis to the Shannon, at Lord's Eock. 



ll.I.A. PP.OC, VOL. XXV., SEC. B.] I 



