46 T. W. E. DAVID. 



The trend of the "Gympie" and Permo-Carboniferous- 

 Glossopteris Beds is, according to Dunstan, about W. 40° N. 

 with a dip to S. 40° W. 1 The Cumberland Islands and 

 Whitsunday Island are almost certainly horsts amongst a 

 network of faults. The trachytic volcanoes described by 

 Mr. A. Gibb Maitland 2 to the W. and N.W. of Mackay, such 

 as Mount Mandurana, Mount Jukes, etc., mark a continu- 

 ation of the disturbance lines in this zone, upon which are 

 seated the above extinct trachyte volcanoes. A few other 

 important fault lines may be mentioned. Dr. Jensen 3 figures 

 a probable line of fault running from near Mount Flinders 

 in a N. by W. direction to the west of Ipswich. Several 

 faults are figured on the geological survey maps of the 

 Ipswich Coal-field, these have a general trend N.W. to N.N. 

 W., with a throw to N.E. Dr. Jensen 4 has figured a fault 

 north of Brisbane, striking W. 40° N. to S. 40° E., and throwing 

 probably at least 1 ,000 feet to N. 40° E. To the south-west of 

 this fault lie the phyllites, hornblende schists, glaucophane 

 schists, anthophyllite schists, cyanite-rutile granulites, etc. 

 of the Mount Mee and D'Aquilar Range area. This appears 

 to have been the core of the old Main Divide. In the 

 Gympie Gold-field are a large number of faults which have 

 been mapped by Mr. W. H. Rands, f.g.s., 5 and Mr. B. 

 Dunstan. 6 The " Smithfield Orosscourse " runs E. 10° N. 

 (true) with a N. 10° W. downthrow of 530 feet. The normal 

 strike of the Gympie strata is in a general N. by W. and 

 S. by E. direction. The Inglewood Fault strikes near E. 



1 Geol. Surv,, Queensland, Bulletin No. 11. Eeport on the Geological 

 Features of the country between Warren and Mount Lion in the Rock- 

 hampton District. Brisbane, by authority, 1900. 



2 Geol. Surv., Queensland. Geological Features and Mineral Eesources 

 of the Mackay District. By authority, Brisbane, 1889. 



3 Proc. Linn. Soc. N. S. Wales, 1909, Vol. xxxiv, pt. 1, pp. 67 - 104, and 

 specially pi. i. 



4 Proc. Linn. Soc. N. S. Wales, 1906, Pt. 1, p. 103, and see fig. 3, p. 76. 

 4 On the Gympie Goldfield. By authority, Brisbane, 1889. 



6 Eeport of Geol. Surv. in course of publication. 



