394 STANTON AND MARTIN — MESOZOIC SECTION ON COOK INLET 



position, varying from granite to andesite and basalt. The more acid 

 dikes are apparently characteristic of the Triassic rocks, and were in- 

 truded soon after the folding which must have closely followed Triassic 

 time, for they do not cut the younger rocks. A characteristic exposure 

 of these folded beds is shown in plate 67, figure 1, and their relation to 

 the Jurassic is indicated by the comparatively undisturbed condition of 



Figure ].—Map of Cook Inlet and the Alaska Peninsula. 

 Showing the distribution of the Mesozoic rocks. 



the Upper Jurassic sandstones less than one-fourth mile distant, as seen 

 in plate 68, figure 2. 



The Triassic fauna of the region as now known is almost limited to the 

 single species Pseudomonotis subcircularis Gabb, which is very abundant 

 in certain layers of shale and limestone at Bear cove and Cold bay. 

 Specimens from the latter locality were described and figured by Fischer 

 as Monotis salinaria, which it resembles in its general features, but a com- 

 parison of a large series of specimens from Alaska with a similar series 



