590 GREAT SERPENTINE-BELT OF NEW SOUTH WALES, V., 



flood-plain. The best examples of these are the gravels south of 

 the Cockburn River, near Kootingal railway-station, which are 

 exposed in the road-cutting by the Public School. A large 

 terrace covered by gravel, also occurs on the point between the 

 Peel River and Goonoo Goonoo Creek, in Portions 15 and 21 of 

 Calala Parish, and smaller masses at other points, e.g., by the 

 rail way- viaduct at West Tarn worth, in Portions 1 and 30 of 

 Calala Parish, and north of the Peel River by Nemingha railway- 

 platform. These consist, for the most part, of pebbles of jasper 

 and quartz, with a binding of clay and red loam. Scattered 

 pebbles of rocks of the Eastern Series can be found in several 

 other spots, and doubtless represent other terraces, now more or 

 less destroyed. Practically all the pebbles in the terrace-gravels 

 have been derived from the Eastern Series. 



Drift. 



The masses of drift have not been separated from the terrace- 

 gravels in the map, though they are a noteworthy feature in 

 the agricultural geology of the district. We may distinguish 

 stream-drift, the material brought down and deposited in an 

 irregular manner, by the tributaries of the main rivers, and 

 superficial drift, flanking the bases of the hills and accumulating 

 through general soil-creep, etc., and, generally, any widespread 

 deposit not flood-plain alluvium, which completely hides the 

 underlying rocks. 



The stream-drift deposits are well seen in the valleys of 

 Nemingha and Gap Creeks, in the south of the Nemingha Parish. 

 The latter has entirely filled its valley, and does not debouch as 

 a single stream; the former had also a wide distributary area, but 

 has recently been confined to a single channel. Spring Creek, by 

 the serpentine, has also a great accumulation of detritus; and 

 isolated patches of gravel, high above the present creek, as on 

 Portions 70 and 85, indicate where the older stream-drifts of this 

 creek joined with the terrace-gravels. These drifts cover the 

 western margin of the serpentine to a great extent. To a com- 

 bination of stream-drift and soil-creep is due the great thickness 

 of gravel and soil along the foothills of the range behind Tam- 

 worth, and, in particular, that between Long Gully and Cleary's 



