Mar., 



Mar.,-] 

 1913 J 



Excursion to National Park. 



179 



Tetrarrhena juncea, R. Br. 

 Tetratheca pilosa, Labill. 

 Thelymitra ixioides, Swartz 

 Thomasia petalocalyx, F. v. M. 

 Thysanotus tuberosus, R. Br. 

 Todea Iiarbata, Thunb. 

 *Trachymene heterophyllya, F. 

 Tricoryiie elatior, R. Br. 

 Urlica incisa, Poir. 

 Utricularia dichotoma, Labill. 



,, lateriflora, R. Br. 



Veronica Derwentia, Litt. 



,, notabilis, F. v. M. 

 Villarsia reniformis, R. Br. 

 Viminaria denudaia, Sm. 

 Viola hederacea, Labill. 

 Wahlenbergia gracilis, A. D. C. 

 Xanthorrhcea australis, R. Br. 



,, minor, R. Br. 



Xanthosia pilosa, Rudgr. 

 Xerotes longifolia, R. Br. 

 Xyris gracilis, R. I5r. 

 Zieria .Smithii, Andrews 



*Scaevola Hookeri, F. v. M. 

 *Schoenus axillaris, Poir. 

 Scirpus cartilagineus, Sprang. 



,, nodosus, Rottb. 

 Sebsea ovata, R. Br. 

 Senecio australis, Willd. 



,, odoratus, Horn. *Trachymene heterophyllya, F. v. M. 



,, velleyoides, Cunn. 

 Solanum aviculare, G. Forst. 



,, nigrum, L. 

 Sperguiaria rubra, J. and C. Presl. 

 Sphoerolobium vimineum, Sm. 

 Sprengelia incarnata, Sm. 

 Stackhousia linarifolia, Cunn. 

 ,, spathulata, Sieber 



,, viminea, Sm. 



Stellaria flaccida. Hook. 



,, pungens, lirong. 

 Stipa setacea, R. Br. 



,, teretjfolia, Steud. 

 Stylidium graminifolium, Swartz 

 Stypandra CKspitosa, R. Br. 

 Sua:da maritima, Duni. 

 Swainsona lessertiifolia, D. C. 



Physiographical Notes. — By A. J. Robertson, M.Sc. 



The geology of the National Park was dealt with in some 

 detail by Dr. G. B. Pritchard, F.G.S., in the report of the first 

 " camp-out" of the Club, in December, 1905 {Vict. Nat., xxii., 

 p. 2i()), so that it is not necessary now to repeat what he has 

 already written ; but it may be of value to add a few notes 

 dealing more particularly with the features met with during 

 our outing at Christmas. 



Briefly stated, the granite — the prevailing rock of the 

 Promontory — has been greatly weathered, and the Vereker 

 Range, to which our observations were confined, affords 

 numerous instances of rounded tors, poised blocks, and rocking 

 stones, all produced by atmospheric action. The granite 

 consists of three primary minerals — quartz, orthoclase felspar, 

 and biotite — with some muscovite and black tourmahne in 

 much smaller quantities. The rock is distinctly porphyritic, 

 the felspars being of large size, and, being thus coarse-grained, 

 is more susceptible to weathering than a finer-grained stone 

 would be. One or two features call for sjiecial remark. The 

 granite bosses, besides being of general rounded outline, are 

 not infrequently hollowed out in a curious manner — from 

 shallow recesses to even small-sized caves. These are all due 

 to unequal weathering of the rock masses, de])ending upon a 

 slight variation in the composition of the rock in question and 

 its position as regards the sun and the prevailing winds. 



At the Darby River the formation of the aeolian limestone 

 can be easily traced from the calcareous sand-dunes through 



