Crawford.] 52 [April 5, 
I'roiii north to soutli. The images, esj)eciallj tlic faces and lieads, 
the natural Hnes, in-omiiiences and depressions of the human body, 
were carefully executed and skilfully developed. Tlie work was 
well done, especially when we consider the early age at which it 
was performed, and it i)roves an observant, thoughtful, ]>ains- 
tnking people, who at that date in man's history were capable of 
chiseling hard rocks into representations of men with only brittle 
flint, jasper, and felsite tools. 
Evidences of geological age. The geological time in Avhich the 
sculptors lived and worked is discovered by examining and com- 
paring the four lines of deposits of drift, ejecta, and debris found 
encircling the mountain at different altitudes, and marking the 
limit of subsidence during each of four distinct oscillatory move- 
ments of subsidence and elevation, and also by a study of the syn- 
chronous deposits of fossils in the same zone a few leagues distant. 
The earliest deposit recording subsidence occurred during the 
early or middle part of the Champlain epoch anterior to the 
forming of the syncline on the western side of the island, and its 
drift, ejecta, and detritus are found in a line around the mountain, 
hardened into irregular or oval shaped, partly stratified areas, 
at an elevation of about 450 feet above the lake, and corre- 
sponding in altitude and synchronous with a large deposit of Ostrea 
ininceps Wood found about forty miles southeastward. 
The second sediment recording siibsidence occurred during 
the latter part of the Champlain epoch and formed the syncline, 
tilling the soutiiern half of it with materials in part silt and loess 
and traceable at intervals in a zone around the mountain at an 
elevation of about 100 feet above the lake. That this subsidence 
was anterior to the works made by man in the valley of Momo- 
tombito is evident from the fact that some of the rocks which had 
been removed into the valley by man were jailed up on and 
covered a part of this line of deposit. 
The third ring of sediment encircling the mountain, half 
hardened by cementing materials and showing subsidence, was 
found at an elevation of about 40 feet above the lake ; of this 
deposit crossing the valley of Momotombito no connected line can 
be observed now, nor is Irliere any evidence of it at the stone 
images. Probably the men working at the temple or images had 
loosened it in the valley, and floods of rain had swept it into the 
lake, but it is easily traced on either side of the valley. 
