of Mixed Rocks. xxi 



Speciesl. PSEFITE. (The greater part of the ^orf^^/f^-ewf/e.) 



An argillaceous paste enveloping disseminated and mid- 

 ling sized fragments of mica-slate, clay-slate, whetstone-slate, 

 and other rocks of the same formations. 



Principal varieties. 



Red Ps With a red paste. 



(Fragments of whetstone slate, grains of fel- 

 spar, &c. rotlie-todt-liegende of Zorge in 

 the Hartz,^witli small grains of quartz, 

 rothe-todt-liegende of EIrich in the Hartz, 

 — fragments of mica slate, clay slate, &c 

 thonporphyr of Clcmnitz in Saxofiy.) 



Species 3. PUDDINGSTONE. (Poudinsue.) 



A rock principally composed of tolerably large uncrystal-. 

 lized portions, agglutinated by a paste. 



Principal varieties. 



Anagenic P Primitive rocks united by a cement, either 



schi*tofe or of saccharine limestone. 

 (Trient in the Valais. Col de Corniet, in the 

 late department of Mont Blanc.) 



Petrosii-iceotjs P Rocks of all kinds united by a petrosilioeous 



cement. 



Argillaceocs P Quartzose nodules united by an argillacaous 



cement. 

 (Lautenthal in the Hartz.) 

 Polygenic P Rocks of all kinds united by calcareous ce- 

 ment. 

 (Nagelfluhe of the Rigi.) 



Calcareous P. ^, . Calcareous nodules united by a calcareoas 



cement. 

 (Nagelfluhe of Salzbourg.) 



Siliceous P,. . , Nodules of silex in a paste of homogeneous 



sandstone. 

 (Environs of Nemours.) 



Jasper P Nodules of agate, &c. in a paste of agate or 



jasper. 

 (Pebbles of Rennes.) 



PsAMMlTE P Nodules of silex, &c. in a psammite paste. 



(Scotland, employed at London in the con- 

 struction of the docks.) 



