238 NOTKS ox THE TERMIAN SYSTEM OF 



Westoe, West Boldon, Clack's Heiigli, Pallion, Mill Field, 

 Huml)leton, Tuiistall Hope, Painshaw Hill, and most other 

 parts of the escarpment to Pierce Bi-idge. 



The Conglomerate is a very local deposit of rounded frag- 

 ments of Compact-Limestone imbedded in a limestone matrix. 

 It is of inconsiderable thickness, and passes into the associated 

 Compact-Limestone. 



Char. Foss. — Same as in Com2)act-Limestone. 



Loc. Tvnomouth. 



3. Marl-Slate. 



The Marl-slate is a very thin deposit, seldom exceeding a 

 yard in thickness, of a dark grey, or yellowish, finely laminated 

 marl. 



Char. Foss. — Palceonisci, Platijsomi, and other fishes; Dis- 

 cina KonincJci, Gein. ; Liiigula Crediieri, Gein. ; Caulerpites sela- 

 ginoides, Schloth., and other fucoids. 



Loc. Cullercoiits, Tynemonth, Westoe, Down Hill near 

 West Boldon, Clack's Heugli, and most other places on the 

 escarpment. 



General Remarks. 

 The foregoing divisions include all the beds which can be with 

 safety referred to, and satisfactorily determined to belong to the 

 Permian System, as develojjed in the counties of Durham and 

 Northumberland. But it has hitherto been the custom of Eng- 

 lish geologists to consider an extensive bed of friable yellow 

 sandstone, and also a bed of red sandstone lying immediately 

 beneath these, as members of the same system, and to separate 

 them b}^ a distinctive name from the subjacent coal-measures, 

 with which they are perfectly conformable, and, so far as the 

 red sandstone is concerned, identical in fossil contents. At 

 Cullercoats and Tynemonth the red sandstone is so evidently 

 conformable to, and passes so gradually into the shales and sand- 

 stones of the true coal-measures, that it is impossible to separate 

 them, or point out a line of separation. The same arrangement 

 also is seen on the banks of the Wear, near Clack's Heugh, 



