42 Notes on the Discovery of some Keys. 



No. 2 is a sample of the old sea beach shells from Lime- 

 burners' Point. 



No. 3 is a sample of the soft white limestone, with pholas 

 shell as described. 



Thomas E. Rawlinson. 



6/11/74. 

 Sections to illustrate paper : 



Mr. Latrobe's sketch, section of Boucher's Kiln. 



No. 1. Section from Mud Island to Two Sisters. 



No. 2. Section from Low Light, Shortland's Bluff, to 

 Quarantine Station. 



No. 3. Section about one-third distance from Point 

 Lonsdale to Shortland's Bluff to Point Nepean. 



No. 4. Point Lonsdale to point Nepean. 



No. 5. Sketch, Plan of Entrance to Port Phillip and of 

 Corio Bay. 



N.B. — In the discussion on the paper the President, 

 in reply to a question, stated "there was no doubt as to 

 the shells of the old beach exhibited being marine." 

 This decision is conclusive against Mr. Latrobe's. theory 

 of an inland lake. 



One member stated that the circumstances of the dis- 

 covery of the keys were notorious at the time, and much 

 discussed, as he knew from having heard his father frequently 

 allude to the circumstances ; and this is the more valuable, 

 as being still further an additional confirmation of the 

 accuracy of Mr. Latrobe's notes of byegone events. 



It was pointed out that owing to the peculiar formation 

 of the superincumbent beds at Boucher's Kiln, and their 

 limited extent, an indent or short gully probably existed at 

 this point, and this would account for the lowness of the 

 limestone rock at this place, and the three distinct layers 

 of clay and loam between it and the soil, each deposit being 

 made at intervals of time, as the upper surface showed a 

 black line of deposit straight on the upper surface, and 

 evidence of settlement on the lower edge, into the fine 

 deposit below. Still water in a shallow gully would be 

 quite sufficient to account for the several deposits, and 

 under such conditions the accumulations would be rapid, 

 owing to precipitations of mud from the surcharged waters 

 of the valley north-west of the You Yangs. 



