BY W. N. BENSON. 



499 



The radiolaria, in the Tamworth Beds, were studied by Dr. G. J. 

 Hinde, who described fifty-three species, all of them new, belong- 

 ing to twenty-nine genera, of which four were new(ll). 



(c) The Baldwin Agglomerates lie conformably below the Bar- 

 raba Series. They are of the same nature as the bands of tuffa- 

 ceous agglomerate that lie in the latter, and are merely coarser in 

 gram. They consist of fragments or boulders, up to a foot in dia- 

 meter, of granite, and quartz-porphyry, keratophyres, trachytes, 

 spilites, porphyritic andesites (holocrystalline or pumiceous) 

 augite-diorite porphyrites, quartz-dolerites, radiolarian chert, or 

 cherty tuffs, and fragments of limestone containing determinable 

 fossils : Heliolites, Syringopora, and Stromatopora have been 

 noted. The pebbles are included in a matrix of andesitic or spilitic, 

 tuffaceous nature. Here and there, they pass into tuffaceous brec- 

 cias, indistinguishable from those of the Tamworth Series. In the 

 Bingara district, they are interbedded with radiolarian cherts, and 

 contain flows of rapidly chilled, porphyritic spilite of a very basic 

 character. In places, there are lenticles of finer-grained tuff in the 

 coarse agglomerate, and these are of great assistance in determin- 

 ing the true bedding-plane. In a few places, Lepidodendron aus~ 



