230 The Ottawa Naturalist. 



organic remains determined by James Hall, Newberry, Felix, 

 Castillo and Aguilera and others are given. The volume closes 

 with a chapter on volcanic rocks and a well-executed coloured 

 geological map of Mexico mentioned above. — H. M. A. 



Calvin, S.-'-Admirdstrative Rfiyort of the State Geologist of 

 Iowa for i8g6. 



The Pleis-tocene geology of Iowa is given by stages and 

 include the following periods : — 



I. The Albertan. — Invasion by glacieis. 

 II. The Aftonian. — Melting interglacial retreat. 



III. The Kansan. — More intense cold than Albertan. 



IV. The Buchanan. —Long stage, interglactal. 



V. The Illinois. — Only small part of Iowa invaded. 

 VI. (Unnamed) — Interglacial modifications of previously deposited drift. 

 VII. The Iowan. — N. half of Iowa over-run by glaciers. 

 VIII. The Toronto (?) sic. — Fourth interglacial, of short duration. 

 IX. The WiscON.siN. — Last invasion of Iowa by ice. 

 X. Rfxent stage. — Wisconsin ice disappeared. 



The above sketch is taken from Prof S. Calvin's comment 

 in the April number of the Avxerican Geologist, and may be of 

 interest to our readers. — H. M. A. 



Watson, Thos. L. — Lakes with more than one outlet. Amer' 

 Geol. Vol. XIX, pp. 267-290, April, 1897. 



The result of observations over the surface of an island 

 located in Hudson Strait, directly off the south-east coast o 

 Baffin Land, named Big Island are here noted. The author 

 quotes R. Bell, A. P. Low and J. B. Tyrrell of the Canadian 

 Geological Survey. He also combats the theoretical assumption 

 that " it is contrary to all known physiographic principles for a 

 lake to exist with more than one natural outlet, for any length of 

 time," a subject upon which we trust to hear further. 



Kimball, James B.— Phi/siographic Geologu of the Puget Sound 

 Basin. Amer. Geol. Vol. XIX, No. 4, pp. 225-237, Minne- 

 apolis, April, 1897. 



Bears directly upon the geological history, of the geolopical 

 history of the Coastal Region of British Columbia and Vancouver 

 Islands. This paper will be of special interests to Canadian 



