BY H. C. RICHARDS. 101 



Works Department, I have obtained a great amount of 

 inform ation as to dates of erection of many buildings 

 throughout the State and the sources of the stones used in 

 them. Mr. T. Wright, the owner of the Helidon quarries, 

 kindly furnished many details as to the periods over Avhich 

 quarries Avorked and also as to the stones used in various 

 structures. To Mr. C*. f. Dornbusch, Architect, Warwick. 

 I am indebted for details as to stones used in the various 

 stone- buildings of that town, while Mr. F. M. Allan, of Rock- 

 hampton, kindly afforded information as to the periods of 

 erection of the important structures in the latter place. 



Building Stones oe Queensland. 

 For genera] purposes we may divide these into three 

 groups : (a) Igneous ; (h) Sedimentary ; (c) Metamorphie. 



Igneous Building Stones. 

 Under this heading we have : — {a) " Granites "" ; {b) 

 Rhyolites and Trachytes ; (c) Basalts. 



• GRANITES. 



The term "" granite "" as used by architects, builders 

 and masons is much wider than that of the petrologist, 

 but the m^'e popular term will be used here. It may be 

 mentioned, however, that granite in its strict petrological 

 sense is a rather rare rock in Australia, and the ''granites" 

 used in Australia almost invariably come xinder the descrip- 

 tion of granodiorites.* 



Enoggera Granite. 



This is a stone Avhich is in close proximity to Brisbane : 

 it has been used to some extent in jmblic buildings, and 

 for kerbing purposes. 



The granite is of late Palaeozoic age, occurs a few 

 miles to the west of Brisbane and outcrops over an oval 

 area aljout four and a quarter miles long in a N. and S. 

 direction and two and three-quarter miles in an E. and 

 W. direction, t 



The quarries have been made on the eastern side of 

 the outcrop, about one third of a mile from the contact of 

 the granite and the schist. They are situated at the '" Gap,'" 



* See Hatch "Text Book of Petrology," 1910 Edition, p. 164. 

 t Bryan, W. H., Proc. Roy. Soc. Qld., xxvi, 1914, p. 147. 



