654 WALLACE. W. ATWOOD 
The limestone conglomerate in the midst of this series, outcrop- 
ping at the North, near the entrance to Hamilton Bay, is a peculiar 
formation in that there are huge angular blocks of limestone in 
it associated with. bowlders ranging from one to three feet in 
diameter. The conglomerate formation is at least 100 feet thick, 
and may represent an important structural division line in the 
Mesozoic section. 
The fossil collections secured from these older formations have 
been examined and reported upon by Dr. T. W. Stanton, as follows: 
Collection No. 4819—North side of Hamilton Bay. 
Pseudomonotis subcircularis (Gabb). 
Horizon, Triassic. 
Collection No. 4820—Hamilton Bay, North side, a few feet below No. 4810. 
Pseudomonotis subcircularis (Gabb). 
Numerous immature examples of this species. 
Horizon, Triassic. 
Collection No. 4821—North side of Hamilton Bay from bowlder in limestone 
conglomerate. 
Rhynchonella. 2 or 3 species. 
Spiriferina? sp. 
The Rhynchonellas are of Mesozoic type, but the species listed 
as “Spiriferina?”’ may be a Spirifer, as punctuate structure has 
not been detected in it. 
Collection No. 4822—From another bowlder in conglomerate at same place 
as No. 4821. 
Rhynchonella sp. same as No. 4821. 
Pecten sp. 
Pleuromya? sp. 
Several other undetermined pelecypods. 
Trachyceras? sp. 
Another undetermined ammonite genus. 
This lot, like No. 4821 from the same conglomerate, seems to 
be of Triassic age. This determination is based on the character 
of two fragments of ammonite in No. 4822, the character of the 
Rhynchonellas of which one species is identical in both lots, and 
the absence of characteristic Paleozoic types. 
According to Mr. Atwood’s determination, this conglomerate 
is stratigraphically between the horizons of lots 4819 and 4823, 
