96 HOLLAND AND TIPPER : INDIAN GEOLOGICAL TERMINOLOGY. 



Stuart (loc. cit., 279) gives the following as the ages of the 

 divisions of the Pegu system : — 



4. Kama clays. Burdigalian to Tortonian. 



3. Upper Prome series (B). Aquitanian. 



2. Lower Prome series (A). Stampian. ^ Oligocene. 



1. Sitsayan shales. Tongrian. 



! 



Stuart asserts that oil is not known to exist below the Kama 

 clays, and that the petroliferous beds in the Upper Burma oil- 

 fields belong to the Kama formation, all; above the base of the 

 Miocene. 



Petlganga beds. — In the Pranhita valley, west of the Wardha valley 

 coalfield there occurs a series of limestones and shales, which 

 was identified by W. King (Mem., Geol. Sun., hid., XVIII, 224, 

 1881) as similar to the Pakhals and Cuddapahs. These had 

 previously been regarded by the Geological Survey as probable 

 equivalents of the Vindhyans, but King recognised two divisions, 

 one of which resembled his Sulla /ais (Kurnools) and the other, 

 the Pern beds, his Pakhals (Cuddapahs). 



Physa beds. — Name equivalent to Intertrappean and used by W. T. 

 Blanford (Rec, Geol. Surv., hid., V, 93, 1872), so-called from 

 the common occurrence of Physa -prinsepii in them. 



Plant-bearing system of Afghanistan. — Name provisionally used 

 by C. L. Griesbach (Rec, Geol. Surv., hid., XIX, 49, 53, 1886) to 

 include beds above the Permo-Carboniferous limestones as far 

 up as the Red Grit series (q. v.). Subsequent papers show these 

 beds distributed to positions on the European stratigraphical 

 scale as Permian to Neocomian (Rec, Geol. Surv., hid., XX, 95, 

 1887). The correlations are revised for part of the area by H. 

 H. Hayden (Mem., Geol. Surv., hid., XXXIX, Part I, 1911)'. 



Plateau gravels. — Term used by F. Noetling (Mem., Geol. Surv., 

 Ind., XXVII, 54, 1S98) for one of the divisions of his 

 Diluvium in Upper Burma. The beds consist of pebbles of 

 various sizes set in a deep-red ferruginous sand. E. H. Pascoe 

 (Mem., Geol. Surv., hid., XL, 49, 1913) in his account of these 

 deposits says that the pebbles are derived from the Irrawadian 

 conglomerates. Broken bones have been found in the beds. 

 Traced laterally this gravel passes into the Plateau red earth, 

 a name used by Pascoe (of. cit., 49), 



