1894.] Geology and Paleontology. 1029 
Prof. Shaler offers additional evidence of orogenic action in produc- 
ing the folds of the Cretaceous and early Cenozoic beds on the Island 
of Martha’s Vineyard, Mass. As to the origin of those movements, 
the author inclines to the hypothesis that transfers of sediment tend to 
excite mountain building action. The exposures at Gay Head and 
elsewhere show that a great mass of sediment accumulated in that area 
in a brief period, and the orogenic movements of southeastern Massa- 
chusetts occurred shortly after this importation of detritus. (Bull. 
Geol. Soc. Amer., Vol. 5, 1894). 
The record of stri: made by Mr. Tyrrell, during his exploration of 
N. W. Canada and Hudson Bay, shows that one of the great gather- 
ing grounds for the snow of the Glacial period in North America was 
a comparatively short distance west of the northern portion of Hud- 
son Bay, and that from that centre the ice flowed not only towards 
the Arctic Ocean and Hudson Bay, but it extended a long distance 
westward towards the Mackenzie River, and southward towards the 
great plains, while Hudson Bay was probably open water. (Geol. 
Mag., Sept., 1894). 
