( 3G5 ) 



On the. Upper Greywacke Series of England mid Wales, 



TABLE of the Order of Stratified Deposits which connect the Car- 

 boniferous Series with the older Slaty Rocks in ilie Counties of Sa- 

 lop , Hereford, Montgomery, Radnor, Brecknock, CaermartJien, 

 Monmouth, Worcester, Stafford, and Gloucester. By R. I. Mur- 

 CHisoN, Vice-Pres. Geol. Soc. and Royal Geog. Soc, F.R.S., 

 F.L.S., &c. &c. 



The history of the nature and succession of the Upper Transi- 

 tion Rocks has long been a desideratum among; geologists, and no 

 attempt has hitherto been made to point out their order. Having 

 discovered, in the above-mentioned counties of England and Wales, 

 a series of deposits replete with organic remains, which seemed to 

 afford a complete key to a large portion of the rock formations 

 hitherto much neglected, the author has been led to devote himself 

 specially to the study of this branch of the science during the last 

 three years, during which he has coloured geologically all the sheets 

 of the Ordnance Survey which relate to this region, and has col- 

 lected a great number of organic remains which were previously 

 unknown to naturalists. Struck by the nature and objects of these 

 operations, and their importance to the completion of the geology 

 of England and Wales, many noblemen and gentlemen have requested 

 the author to publish his views in a separate work, accompanied by 

 a map, sections, and figures of the organic remains in each forma- 

 tion. He has consented to prepare such a work, and Mr John 

 Murray, Albemarle Street, has offered to receive the names of all 

 persons who will join as subscribers. This work will describe not 

 only the formations beneath the coal measures, but also all those 

 younger deposits which overlie them in the country under review, 

 as well as all the associated Sienitic and Trappean Rocks and their 

 effects. But the chief value of this work will consist in the esta- 

 blishment of complete types of the succession of these deposits in 

 the descending order, commencing with those strata which are 

 already well known, and terminating downwards with those slaty 

 rocks in Wales and Cumberland, with which Professor Sedgwick 

 has rendered himself so familiar, and of which he is about to under- 

 take the illustration ; the author having, conjointly with the Pro- ' 

 fessor, examined such portions of the country as have enabled them 

 to connect clearly the upper system of the one, with the more deep- 

 seated rocks investigated by the other. The annexed tabular view 

 is offered, in the mean time, as a synopsis of part of the labours of 

 Mr Murchison. 



VOL. XVII. NO. XXXIV. — 0(TODER 1834. B b 



