APPENDIX. NO. 1. 
253 
A little below this singular place, the country again declines, 
when a tertiary fossil formation shews itself, which, rising gra- 
dually as an inclined plane, ultimately attains an elevation of 
300 feet. This formation continues to the very coast, since 
large masses of the rock were observed in the channel of com- 
munication between the lake and the ocean ; and the hills to the 
left of the channel were based upon it. This great bank cannot, 
therefore, average less than from seventy to ninety miles in width. 
At its commencement, it strikingly resembled skulls piled one 
ou the other, as well in colour as appearance. This effect had 
been produced by the constant ripling of water against the 
rock. The softer parts had been washed away, and the shells 
(a bed of Turritella) alone remained. 
Plate 1, Figures 1, 2, and 3, represent the selenite formation. 
Plate 2, represents a mass of the rock containing nume- 
rous kinds of shells, of which the following are the most con- 
spicuous : 
Cardium. 
Pectunculus 
Corbula 
Area 
Conus, and 
Others unknown. 
The following is a list of the fossils collected from vari- 
ous parts of this formation, from which it is evident that a 
closer examination would lead to the discovery of numberless 
species. 
TUNICATA . 
PLATE III. 
Fig. 1 Eschara celleporacea. 
2 piriformis. 
3 unnamed. 
