1863.] SALTER UPPER OLD RED SANDSTONE. 489 



4. In our postscript we inclined to the view that No. 3 was a de- 

 cidedly Carboniferous group ; but this was owing to the mistaken 

 notion that the Pilton or Upper Marwood group was the equivalent 

 of the Carboniferous slate, — a statement made on my own authority, 

 as above noticed. For all else in this memoir, except the supposed 

 identification of the S_pirifer disjunctus in the Carboniferous Slate, and 

 of S. cuspidatus (which I now believe to include S. Barumensis) in the 

 Coomhola Grit, I am willing to be equally responsible with Mr. Jukes. 



§ 6. Foreign Equivalents. 



On these I do not intend to say much, having never seen the 

 French and Belgian Devonian rocks. But the broad and general 

 view of them given in the second edition of ' Siluria,' together with 

 Messrs. Sharpe and Godwin-Austen's papers in our own Journal, 

 surely entitle us to attempt the parallel, which I hope personal ob- 

 servation will enable me one day to verify. 



In the last edition of ' Siluria' the three or, rather, four subdivi- 

 sions of the Old Red Sandstone are thus given in ascending order : — 



' This term has given rise to much con- 

 fusion, and the beds would be much 

 better called " Ledbury Shales ;" I, 

 therefore, propose this term for them. 



2. Lower Devonian, "Co-"} ™ . , , ~ , , . _ 



blentzSandstone,"Low- Chmc^ed^^AaZcap^ft^iH*, 

 er Cornstone group of \ ^f f > &*•> as wall » ^ pecm- 

 the Old Eed. J liar bheUs ' 



3. Middle Devonian, Eifel ) ~ . . 7 . ^ . . n 7 



j ™ j.\. t- Coccosteus, Asterolepis, Dipterus, Cal- 



and Plymouth Lime- y 7 , . € i 



A .,, -m ceola, btrinqocephatus. 



stones, Caithness Flags. J J r 



. tt -p. . Tr „ C Holopty chins, Glyptopomus, Cucullcea 



4. Upper Devonian, i ellow * • j-i-n 



i -r. t ci i ^ trapezium, Avicula Damnomensis, 



and Eed Sandstone, a • -x J- • * a*-l • 



~ . ,. , . , ™. V /Splinter disjunctus, Attains concen- 



Cypridina- schist, Jmnz< * • «* iij.Li j. < n 



^K -rr , n, . \ trica, iStrophalosia suoaculeata, Car- 

 ana Kramenzel-Stem, ,• 7 c . /> 7 • D7 



dium palriuitum, (Jlymenice, rkacops 



granulatus. 



1. Tilestones or " Passage 

 beds." 



Petherwin Group. 



Comparing with the above series the last revision of the Devonian 

 Geology of the Rhenish Provinces, as given in the Map of Yon 

 Dechen and his associates, we find the following : — 



1. Ardennes Schiefer, Co-^1 m , , , , , 



,, c,.,, / Inese are represented truly by our 



blentz-Schichten (or T . , ,v, J . i r ,, 



Smrifer Sandstone^ f Lmton and ¥owe ? S rou P s > m North 

 xrr- v v, a i.- j> Devon and Cornwall. 



Wissenbacn Scnieier. J 



2. Lenne- Schiefer, Eifel- 1 Plymouth and Combe-Martin Lime- 



Kalk. J stones. 



3. Cypridinen- Schiefer, in- i 



eluding the Goniatite- | 



shales, Flinz, and Kra- )>Petherwin Group in every detail. 



menzel-Stein withC%- 



menice. 



VOL. XIX. PART I. 2 L 



