408 STANTON AND MARTIN — MESOZOIC SECTION ON COOK INLET 



These beds, with Aucella cf. crassicollis, comparable with the Upper Knox- 

 ville beds of California, are widespread in Alaska, though we found no 

 indication of them at any localities studied by us. The species was ob- 

 tained by Mendenhall on Bubb creek, a branch of the Taxlina, in the 

 Matanuska series ; by Spurr in the Oklune series on the Kanektok near 

 the mouth of the Kuskokwim ; by Schrader in the Koyukuk and Anak- 

 tuvuk series in northern Alaska, and by Wright on Admiralty island, 

 southeast Alaska, where Aucella piochi, another Lower Cretaceous species, 

 was found at a neighboring locality. It also occurs in the Mission 

 Creek series on the Yukon. The geographic distribution of these Cre- 

 taceous Aucella beds is thus seen to differ radically from the distri- 

 bution of the Naknek formation with its Jurassic Aucellse, and this is 

 regarded as evidence of a probable unconformity between them. 



UPPER CRETACEOUS 



On Chignik bay Upper Cretaceous rocks, closely associated with plant- 

 bearing Kenai beds, occur on the lagoon 1 to 2 miles northeast of 

 the Alaska Packers Association cannery and on Whalers creek, 5 miles 

 west of the same place, where they apparently include a workable coal 

 bed. The exposures at the first locality consist of several hundred feet 

 of shales and sandstones with some thick beds of coarse conglomerate in 

 the middle portion. The beds beneath the conglomerate contain great 

 numbers of fossil plants, a collection of which yielded the following 

 Upper Cretaceous species identified by Doctor Knowlton : 



Osmunda arclica. Zamites sp. 



Sequoia reichenbachi. Myrica sp. 



Sequoia rigida. Querous johnstrupi. 



Taxodium sp. Quercus n. sp. 



Torreya brevifolia. Ziziphus sp. 

 Anomozamites schmidti. 



The shales above the conglomerates yielded Inoceramus fragments, 

 Pecten, Nucula (Acila) cf.truncata, Corbula, Thracia, Dentalium,Cinulia, 

 and some undetermined ammonoid fragments. 



At the locality on Whalers creek Mr R. W. Stone obtained an Inoce- 

 ramus, related to 2". digitatus, a Trigonia of the type of T. leana, and 

 Anomia. 



These fossils indicate correlation with a horizon in the Chico as de- 

 veloped in California and Vancouver island, which includes practically 

 all of the Upper Cretaceous, but the beds at Chignik are probably not 

 older than basal Senonian. 



Beds of possibly the same age occur on the north shore of the small 

 bay north of Aievak or Douglas village, where there is a series of shales 



