190 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
however, while extensive excavations were being made at Stage Fort (L, 
Plate 1) on the western end of Pavilion Beach I found these beds re- 
vealed in such remarkably perfect condition as to show not only the fos- 
sil contents, but many other facts as well. Some of the features revealed 
there are very well illustrated in the figures (Plates 9-13). It will be 
noticed that there are two sets of beds, one very much contorted and 
stratified, the other overlying these unconformably. The latter deposit 
is nothing more than the ordinary till of the region, being somewhat sandy 
and very bouldery, as is all of that upon Cape Ann. It rests upon the 
grooved and eroded under-beds with a very distinct unconformity. 
The strata below are folded in such a way as to be even contorted in 
places, and there is thrust-faulting. These beds are for the most part 
clays and sandy clays entirely unconsolidated, although some layers are 
very compact. One or two of the layers are pebbly, especially a layer at 
the base, which is shown in Plate 12. Scattered through the contorted 
layers are numerous angular boulders, some of them shown in the pic- 
tures. In some cases these reach a weight of one to two tons. Some of 
them are foreign to the region, like the erratics which occur on various 
parts of the Cape. 
The stratification proves sedimentation in water, and the scattered 
boulders prove a transporting power different from that which brought 
and deposited the layers of sand and clay. They must have been carried 
by floating ice, having previously been brought from a distance. The 
suggestion occurs at once that these were brought during the first ad- 
vance of the glacier and deposited in the sea at a time when this part of 
the land was below sea level. The ice of the second advance of the 
glacier overrode these interglacial (?) deposits and failed to remove them 
all, doubtless disturbing their position and causing the intense contor- 
tion noticed, and at the same time placing upon the surface the veneer 
of till. 
Deposit below sea level is also proved by the presence of the fossils 
mentioned by Professor Shaler and those that I collected. The coldness 
of the water is also proved by these, suggesting the possibility of floating 
ice in the neighborhood. While considerable numbers of fossils were ob- 
tained from the fossil-bearing beds of the series, their imperfect state of 
preservation rendered transportation so difficult that, when I came to 
unpack them, I found most of them crumbled to bits; and upon the 
next visit the abundant fossil-bearing layer was no longer exposed; but 
among those which were sufficiently well preserved for identification two, 
also found by Professor Shaler, were characteristic of cold water. One, 
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