HORN KXPEDITIOX OENERAL OEOLOnV. 73 



a])Out ton y.ii'ds wido ; it iiioaiidors tliroui^h .a \alli'y-jil;iin eumpnsod oF i\nc silt ; 

 witliiii ;il>ont tlircc miles fi'oiii its Junction with the llu^li, ilic \;dli'y-pl:i,iii is seen 

 to lie l)onndc(l on each sido liy a tciTacc, at first aliout halt' a-niilc ajtart, finally 

 oonvf'ri;'in_i^ to less than a quarter of a mile. The tei-race is about thirty feet- hii;h, 

 and consists of river-gravels resting-, neai- the hase, on white sand-i'ock-. 



LAca'S'i'itiNE V'ossiL Deposit. — Tlie e.\tensi\-e dexclopment of t,ra\crtine around 

 tlie artesian sprin;;' at D.alhousie Jlead Station, reacliini;- to higher ele\at'ions than 

 the present issue of water, and at one spot ct.intainini;' fossils of a fresh-water 

 habitus, points to the probability "f the former existence of a considerable 

 lacusti'ine area. 'I'he details <if the section are as follows : — 



{(i) Fossilif(M'ous rock, exposure abmit six f(H't in diameter. 



(/') Mound round present springs about ten f(^('t hi,i;li .'ind 3()l) feet in diameter. 

 Water slij^htly saline and warm. Black peaty soil surroundiiii;- moutJi. 



(,-") Debris from (c/) travertine deposit. 



((/) Compact travertine extendin;;- for distance of 300 yards. 



(<') Fifty feet alcove c. Pkain red sand loam with loos(> subani;alar blocks of 

 Desert Sandstone (" lijibbers "). 



(/) ])esert Sandstone risin;;- from eii^fJity to 100 fe(>t above e. 



The fossiliferous rock is a tjypsiferous tull', copiously chai'^ctl with the shells of 

 Afelaiiia I'oiustiila, Itrot., Af. Iiitusa, (Jould, M. baloiuionis, ("on rad, l^illii)iia 

 ni/stralis, Tryon, and Corbiciila siib/di'iiiafa, E. A. Sun'th. No molluscs were found 

 in tlie dam conservini; tlie outflow fi'oni tlie artesian s|)i'imr, and none are existent, 

 so far as we know, foi' many miles around. All the species in the fossiliferous 

 rock are livini;-. Of these Afclauia vciiiislula, HitJiiiiia aiisfra/is, a,nd Coj-lncula 

 sul'lirvii^ata wer-e, hitherto unknown for South Austi'alia till (lisco\'ei'ed by the 

 Expedition, liitlihiia aiistralis was taken alive in the lliver Neales and Storm 

 Creek, near ( )oodnada,tta ; Ah'laiiia venushila and Cdr/'ir/i/a sii/'Iiri'ign/d wci-e 

 found as dead shells in the channel of tlu^ Finke at Crown I'oint. Mt'/niiin /iifosa, 

 as a recent sluill, is known only from Fitzroy Island and Cardwell, N.E. Australia. 



10 



