38 
EXPLANATION OF PLATE 26"'. 
which lies in the middle region of that large, and widely 
extended series of Sandstones, and Conglomerates, Lime- 
stones, and Marls, which English Geologists have usually 
designated by the common appellation of the New red 
Sandstone Group, including all the strata that are inter- 
posed between the Coal formation, and the Lias. 
M. Brongniart, in his Terrain de I’Ecorce du Globe, 
1829, has applied to this middle division the very appro- 
priate name of Terrain Pacilien, (from the Greek mimhoi), 
a term equivalent to the names Bunter Sandstein, and 
Gres bigarre, which it bears in Germany and France ; and 
indicating the same strata which, in England, we call the 
new Red Sandstone. (See Plate 1. Section No. 17.) 
Mr. Conybeare, in his Report on Geology to the British 
Association at Oxford, 1832 (Page 379, and P. 405, Note), 
has proposed to extend the term Pacilitic to the entire 
Group of strata between the Coal formation and the Lias ; 
including the five formations designated in our section 
(PI. 1, No. 15, 16. 17, 18, 19), by the names of New Red 
Conglomerate, Magnesian Limestone, Variegated Sand- 
stone, Shell Limestone, and Variegated Marl. Some com- 
mon appellative for all these formations has been long a 
desideratum in Geology ; but the word Pacilitic is in 
sound so like to Pisolite, that it may be better to adhere 
more literally to the Greek root ttoik/aoj, and apply the 
common name of Poildlitic group to the strata in ques- 
tion.* 
* The general reception of such a common name for all these 
strata, and the separation of the Granwackc series into the Cambriati 
and Silurian systems, as proposed by Professor Sedgwick and Mr. 
Murchison, will .afford three nearly equal and most convenient group* 
or systems, info which the strata composing the Transition and Se- 
condary series may respectively be divided ; the former compre- 
hending the Cambrian, Silurian, and Carboniferous systems, and the 
latter comprehending the Poikilitic, Oolitic, and Cretaceous Group*' 
