The strata at Denmark Hill, both above and below the fossil 

 insect bed, contain several species of plants, of which the following 

 are the principal : Thinnfeldia odontopteroides, Morris ; Tceniopteris 

 Daintreei, McCoy ; Ginkgo bidens, Tenison- Woods ; Pterophyllum 

 multilineatum, Shirley ; Cladophlebis denticulata var. australis, 

 Morris ; Sphenopteris superba, Shirley ; Stenopteris elongata var. 

 spinifolia, Shirley. Descriptions of several of these fossils were 

 made by Dr. Shirley in the Fossil Mora of Queensland.* 



The geological features of the Ipswich Coal Field have been 

 worked out by Mr. W. E. Cameron, Second Government Geologist, f 

 and the accompanying sketch-map of the locality, Fig. 1, showing 

 the position of the insect bed, has been taken from his new map of 

 the field, now in preparation. 



DENMARK HILL INSECT QUARRY. 



Description of the Beds. 



The photographs on Plates 8 and 9 are views of the quarry at 

 Denmark Hill where the fossil insects have been discovered. The 

 beds, it will be observed, have a sharp angle of dip, and further 

 exploration at the bottom of the excavation will be inconvenient 

 on account of the overburden. 



About four chains away from the quarry in a north-easterly 

 direction, the horizon of the insect bed can be traced, and prospecting 

 in this locality might be productive. 



BED A. The position marked A in the photograph on Plate 8 

 forms the base of a number of bands of bluish shale, altogether 

 about 18 inches in thickness, above which other shale beds outcrop, 

 but which are too much decomposed for examination. This series 

 of bands principally contains species of Thinnfeldia, which make up 

 about 95 per cent, of the whole contents, with Beania geminata, 

 Shir., Tceniopteris Tenison- Woodsi, Eth. fil., Scolecopteris australis, 

 Shir., and Ginkgo antarctica, Shir., also present. 



Some of the Thinnfeldia specimens found in the shale at the 

 base of the bed, which rests on volcanic tuff, suggest that a rapid 

 desiccation of the tissue of the leaves took place at the time of 

 envelopment, followed later on by its silicification, probably a result 

 of the percolation of heated mineral solutions from the tuff, &c. 



* Additions to the Fossil Flora of Queensland, <fec., by J.S., p. 20, with 25 plates, 8vo. 

 G.S.Q. Pub. 128, Bull. 7. By Auth., Brisbane, 1898. 



t The West Moreton (Ipswich) Coalfield (Second .Report on), with special reference to the 

 Bundamba District. With 2 maps, one plate and 3 figures. By W.E.C., p. 37 ,8vo. By Auth.. 

 Brisbane, 1007, G.S.Q. Pub. No. 204. 



