EPICONTINENTAL SEA OF JURASSIC AGE 27:3 
the withdrawal also slightly depressed the barrier between the 
provinces. 
Final conclusions.—It now remains to state briefly, in review, 
the conclusions to which the lines of investigation have led. 
They are as follows: 1. The Jurassic formation of the interior 
province of North America was not deposited in a body of 
water of even moderate oceanic depth, but in a shallow epiconti- 
nental sea. 
2. This sea had but one connection with the ocean and that 
connection was with the North Pacific in the Queen Charlotte 
Island region ; in general the outlines of the sea were as indi- 
cated on the map accompanying this article. 
3. There was a connection, during this epoch, between the 
Arctic and Pacific by way of the Bering waters, and by this 
means circumpolar and Pacific faunal communication was estab- 
lished. 
4. The Jurassic deposits of the interior contain but one fauna 
and if more than one period of time is represented it is not indi- 
cated by a change in the fauna. 
5. The fauna of the interior is closely allied to the Cardio- 
ceras fauna of northern Eurasia. 
6. Physiographic rather than climatic condition restricted 
communication between the Californian and interior provinces. 
7. Nothing connected with the history of this Jurassic sea or 
its faunal relations is inimical to the view that during this 
epoch the North American continent had, in general, its present 
outline. 
8. The geographic distribution of land and water, as postu- 
lated by Neumayr for this period, is not supported by the facts, 
in so far as the North American Jura is concerned. 
W. N. Logan. 
