160 EEY. A. lEVING ON THE EED-EOCK 



independent systems * — the Post-Carboniferous and the Trias — 

 between which a certain break seems to be indicated at the base of 

 the Bndleigh-Salterton pebble-bed. 



II. The Post-carboniferous (Permian) of Devon seems to maintain, 

 in broad outlines, the Dyassic order of the German series. The 

 great breccio-conglomeratic series (including the Lower Sandstones of 

 Mr. Ussher) is recognized as the equivalent of the Unter-Eothlie- 

 gendes of Germam', even to the extent of assuming a more sandy 

 facies in the higher beds, as that formation does, e. g. near Gera, 

 where it visibl}^ underlies the Zechstein and overlies the contorted 

 Culm-Measures with seams of anthracite ; and again at the base of 

 the Wartburg Hills, where it is seen underlying the Zechstein series 

 in the splendid sections at Eppigsnellen on the one side, and on the 

 other side in the sand-pits by the Frankfort road beneath the 

 "Wartburg (as well as in Wilhemsthal below the Hohe Sonne), 

 subjacent to the granitoid breccio-conglomeratic series of the Ober- 

 Rothliegendes. 



The "Lower Marls" of Mr. Ussher appear to be the southern 

 equivalents of the Magnesian Limestone series of Durham, and the 

 representatives of the "Permian" Marls of Warwickshire and Staf- 

 fordshire, an intermediate facies of the upper division of the Dyas 

 appearing in the interstratified series of Magnesian Limestones and 

 Eed Marls of Nottinghamshire. 



The Lower Sands of Mr. IJssher must be regarded as merely the 

 transitional assortment of materials between the breccias and the 

 marls ; they are thus all three closely linked together in one and 

 the same geological system. 



III. Prom the base of the Budleigh-Salterton pebble-bed upwards 

 we have the English Trias (properly so called) of the Midlands 

 repeated in outline. While there may be room for difference of 

 opinion as to the correlation of the several divisions of the Bunter 

 of Devon with those of the Bunter of the Midlands and of Salop and 

 Cheshire f , the Keuper of Devon (as the term is limited in this 

 paper) presents quite the normal facies of the Xeuper of those 

 regions. 



lY. The much lower estimates given in this paper for the groups 

 of strata here recognized as Keuper and Bunter respectively than 

 those given by Mr. IJssher, owing to repetition of the beds by 

 faults, compare very well with those of Prof. Hull for the same 

 formations (Keuper 500 or 600 feet) as they are developed in 

 Nottinghamshire and Gloucestershire $. 



Y. I need hardly say that Mr. Ussher's suggestion that the 

 Salterton pebble-bed may be the homotaxic equivalent of the 

 Muschelkalk must appear to me altogether inadmissible. It is far 



* No objection could perliaps be urged to the comprehension of the whole 

 Devon series under the older term ' jS'ew Eed Sandstone,' as was done by De la 

 Beche and Godwin-Austen ; and this, if admitted, is a condemnation of their 

 inclusion under the name Trias, a term of much more restricted range. 



t See Jukes, ' Manual of Geology,' p. 608, fig. 160. 



\ ' Permian and Triassic Eocks of the Midland Counties,' p. 103. 



