SU^triitv Rods of WJtlttlesea. 213 



and at section XIII. ;\re al)iut the .same distance from the axis 

 of the frveat anticline desci-ibed l)elo\v, it is ]n)ssil)le that this is 

 a distinctive band. 



The limestone referred to is found at section VII. on the 

 Cemetery Hill r>iad. It is about 2 feet thick, and exposed along 

 the road for about 35 feet. Tlie rock is n toujih, dense, com- 

 pact, sandy limestone of dark ji'rey cnlour. It is composed 

 almost wholly of brachiopod shells, which, as usual in lime- 

 stones, are only clearly seen on wea.th'erinjr. The fossila may be 

 detected in al)undanco here, as many blocks have been cut away 

 and removed to the side of the r>)ad, thus allowing the weather 

 to develop the organisms. A noticeable feature is the number 

 of ii very large form of Spirifer. described l)y Mr. ChapmaiT in 

 the Appendix. A possible representative of this limestone is 

 found at section YL, lait as the arenaceous constituents of the 

 rocks at the latter section predominate over the calcareous, the 

 conditions of formation were somewhat different. 



Geological Structure. 



The map accompanying this paper (which, in its topography 

 and geological boundaries,^ has been compiled from the Quarter 

 Sheets of the ai-ea) records the dips^, copied from such Quarter 

 Sheets, together with the additional ones taken by myself. 

 These show that the general geological structure of the district 

 is simple — a great anticline, and a well-defined syncline, sepa- 

 rated by a fault. 



The anticline may be traced for about 9 miles from the Yan 

 Yean Reservoir, northward to the south-west of Mount Dis- 

 appointment. Its axis runs from Barber's Creek some 

 distance in a northern direction west of, but approx- 

 imately parallel to, the railway line, the main Whittle- 

 sea road and the Plenty River. As it approaches the 

 townsihip of Whittlesea, it turns towards the north-west, and 

 runs parallel to Bruce's Creek, a north-westerly tributary of the 

 Plenty River. Tliis coincidence of the axial line of the anticline 

 with the direction of the Plenty River and Bruoe's Creek valleys, 



1 For siinplicity I have ignored the AUuvial and Post-Pliocene indicated on the 

 Quarter Sheets. 



i Indicated hv double-headed arrows. 



