17G BRITISH PALAEOZOIC PIIYLLOCARIDA. 



plicata, Kirlhija, sp., Argillcecia eequaJis, and CiithereUa, sp. Also that K. plicata 

 and other species occur at other localities near New Castleton. 



Mr. Dunn has favoured us with the following note on the succession of strata 

 comprised in the " Redesdale Limestone and Shale." The late Mr. George Tate, 

 of Alnwick, divided the Carboniferous rocks of Northumberland into the — 



1. Coal-measures . . . about 2000 feet. 



„ 900 „ 



n -\r . • r . (Calcareous 



2. Mountain-hmestone \ 



V Carbonaceous 



„ 1700 „ 

 „ 1000 „ 

 Calcareous " division, and 



^s 



3. Tuedian 



The " Redesdale beds " belong to the base of the ' 

 they are as follow ; 



1. Shale, containing "Leaf" ironstone nodules. Often replaced by red 

 Boulder-clay, 10 feet. 



2. Redesdale Limestone, 14 feet. 



3. Clayey Sandstone, containing Stigmarla with rootlets, 16 inches. 



4. Yellow, fine-grained Sandstone, calcareous in many places, 9 feet. 



5. Ironstone Shale, 30 feet. Near the top is an ironstone band, about 4 inches 

 thick, and full of organic remains. Fossiliferous ironstone nodules, sometimes in 

 beds, are scattered throughout this shale. 



6. Sandstone, 60 feet. A coal-seam,^ 14 inches thick, occurs in this sand- 

 stone. 



From the Shales and Ironstones of Redesdale Mr. J. Dunn has collected 

 Bithyrocaris glabra, D. tricornis (PI, XXII, fig. 5), D. Diinnii (tail-pieces, 

 PL XXIII, figs. and 10), several gastric teeth of Bithyrocaris (PI. XXVI, 

 figs. 21 — 26, 35, 36), Trilobites {Phillipsia, &c.), and some Fish remains, besides 

 other fossils, obscure and fragmentary. 



^ See also Gr. A. Labour's ' Outlines of the Geology of Northumberland,' 187S, pp. .38, &c. 



