400 STANTON AND MARTIN — MESOZOIC SECTION ON COOK INLET 



Feet 

 Indurated bands of sandstone in ledges 1 to 1£ feet thick, alternating with 



thicker beds of shale 14 



More or less sandy shale weathering yellowish 100 



Sandstone with clay partings with abundant Lima cf. gigantea 36 



Softer sandstone and shale to base of exposure, partly covered by shale talus . 100 



Total 1 ,128 



This section on the mainland at Snug harbor all lies beneath the 

 horizon of zone D in the.Enochkin section — that is, it does not contain 

 any beds with Cadoceras, but on Chisik island, less than 2 miles to the 

 eastward, the upper members of this section, or other beds with the same 

 fauna, are overlain by shales and sandstones with the Cadoceras fauna, 

 and these in turn are followed conformably by the shales, sandstones, 

 and agglomerates of the Naknek;formation with Aucella, etcetera. 



Section of Enochkin formation at Oil bay 



Feet 



Dark shale with concretions , 690 



Hard dark sandstone §-f 



Dark drab shale with numerous concretions 530 



Calcareous shale with Cadoceras schmidti Pompeckj Cadoceras sp. cf. C. 



stenoloboide Pompeckj, and Phylloceras 1 



Dark shale with Cadoceras doroschini, etcetera 60 



Soft green sandstone \ 



Dark-drab shale. 12 



Total .. 1,293 



At Oil bay, which is only 3 or 4 miles from Enochkin bay, the base 

 of the exposure is in the dark shales of zone D with Cadoceras doroschini 

 and a few other forms. The Enochkin formation is here overlain by a 

 good development of the Naknek formation, described on a succeeding 

 page, and the character of the exposures is shown in the photograph 

 (plate 68, figure 1). 



Section of Enochkin formation on north shore of Chinitna bay 



Feet 

 Indurated dark argillaceous shales with conspicuous thin bands and elon- 

 gated lenses of yellowish impure limestone 500 



At this point a change in the strike of the beds and in the direction of 

 the coast carries the cliffs some distance from the shore. The section is 

 continued on a small creek which enters the bay about half a mile west 

 of the sea cliffs. Along this creek the exposures are not so continuous 

 nor so conspicuous as those in the sea cliffs, but they are sufficient to show 

 the relation of the beds to the general section. 

 Dark shales with occasional more indurated bands of argillaceous sandstone . 425 

 Dark shales with beds of argillaceous sandstone forming many cascades, 

 Cadoceras found near the middle 650 



