52 
Geology and Physical Geography 
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Layers above these, as exposed at Iguana Creek and in the 
Mitchell, at Glenalladale, consist of variously alternating thick and 
thin layers of breccia-conglomerate, pebble conglomerate, sandstone 
with occasional pebbles, quartz grits, ferruginous conglomerate, 
sandstones, blue and yellow shales, sometimes containing pebbles, 
and thick-bedded rubbly red or grey shales, without apparent 
stratification, and sometimes calcareous, resembling, as remarked 
by Mr. Selwyn of similar bands near Freestone Creek, the “ corn- 
stones ” of the Old Red Sandstone series of Britain. (Fig. 14.) 
