168 R. ETHERIDGE, T. W. E. DAVID, AND J. W. GRIMSHAW. 
quoyana, M. Edw., perforates sandstone rocks between tide marks; 
both are met with in Port Jackson. The stump belonged to the 
Swamp Mahogany, Lucalyptus botryoides, as determined by Mr. 
R. Baker of the Technical Museum. Near the preceding, we 
observed another stump, (No. 4) on the horizontal section. 
Although the above stump was perhaps not im situ, numerous 
horizontal roots of trees were observed by us on this horizon, 
undoubtedly in situ, and the layer of peaty loam in which they 
occurred was very persistent. (¢) Below the second well marked 
peat horizon is a bed of: unctuous, plastic, dark bluish-grey clay, 
sandy in places, and occasionally showing vertical rootlets passing 
through it. The bottom of this bed rests, at about from nine to 
ten feet below low water, on the submerged forest, and a thick 
bed of peat, developed chiefly at the north-east end of the section. 
Marine shells are very plentifully and rather irregularly scattered 
through it, being most abundant near its upper surface, and, 
(towards the south-west end of the section) they form an irregular 
bed- composed almost entirely of shells, and about two feet in 
thickness, extending from four to six feet below the level of low 
water. 
On the east side of the cutting at position of No. 1 Stump, the 
bed is at least seven feet thick. The contained shells are strictly 
of an estuarine character, such as may now be met with in any of 
the muddy arms of the Parramatta River or sandy beaches con- 
nected therewith. A very similar bed of shells was excavated a 
few years back at Long Cove Creek, between Leichhardt and 
Dobroyd, Ashfield, the lithological character of the deposit being 
very similar to that of the present bed. 
The organic remains so far obtained from this horizon, Shea’s 
Creek, are as follows:—Annelida: Polydora ciliata, Johnston 
(borings). Echinodermata: Salmacis Alexandri, Bell. Pelecypoda: 
Anomalocardia trapexia, Deshayes ; Clementia papyracea, Gray ; 
Tapes undulata, Lam.; Tapes turgida, Lam.; Tellina deltoidalis, 
Lam.; Tellina sp. Dosinia circinaria, Deshayes; Circe scripta, 
Pinwe: Pecten fumatus, Reeve; Pecten tegula, Wood ; Spisula 
