BY W. N. BENSON. 323 



served (8). Professor De Koninck determined this as P. ver- 

 neuilii{9). The duties of Mr. F. Odernheimer, who made a private 

 survey of the land belonging to the Peel River Land and Mineral 

 Company, must have involved the investigation of this region, 

 but no special attention is directed to it in his paper "On the 

 Geology of a part of the Peel River District in Australia," pub- 

 lished in 1855(10). Stonier mentioned the occurrence of serpen- 

 tine near Black Jack, 1892(11). The present writer described 

 the southern portion of this district in 1911(1), and 1913(3) in 

 his papers on the Nundle District, gave petrological details of 

 the occurrence of keratophyres on Silver Gully, and the pillow- 

 lavas near the Peel River in 1915(5), and included the northern 

 edge of the district in the area covered by his paper on the Tarn- 

 worth District, later in the same year (6). In this paper, the 

 position of the Loomberah Limestone, as a definite horizon dis- 

 tinct from the Nemingha and Moore Creek Limestones, was first 

 remarked. 



Preliminary notes on the fossils collected from the limestones 

 of this district by Mr. S. M. Tout and the writer were made by 

 Mr. Dun (12); and a number of analyses of specimens of this 

 limestone were given by the chemists of the Geological Survey 

 (13). Dr. Jensen cites the results of some investigations not yet 

 published in detail, which were made by Mr. Guthrie, on the 

 nature of the soils in the regions of the limestones in this 

 district(14). 



Beyond these, no references to the district in geological liter- 

 ature are known to the writer. 



Physiography. 

 The region lies for the most part west of the Peel Ptiver, 

 stretches from the south of the Parishes of Nemingha and Tam- 

 worth, and includes all the Parish of Loomberah and a large 

 region comprising the north-eastern corner of the Peel River 

 Company's estate. Its eastern margin is, in fact, marked by 

 the deep meandering valley of the Peel River, an underfit stream 

 with broad alluvial flats between spurs, sometimes sharpened, 

 but more generally blunted (cf. 15 j. To the east of this, the land 



