Tejou 



Martinez 



ABSTRACTS OF PAPERS 149 



Pacific province Gulf province 



SiphonaUa suttcrc)isif< .?:oiie ^ p. .. 



BalanophylUa variaMUs zone j 



f Lower Claiborne 

 Rimella simpler zone ^ ™.., 



TurMnoUa zone Midway 



Solen stantoni zone "^ 



TrochocyatJms zittcli zone I Puerco and Torrejon ( ?) 



Meretrix dalli zone 



J 



New occurrences of glacial deposits in the Paleozoic rocks of southeast- 

 ern Alaska were described in the next paper, which was presented for the 

 author by the Secretary and illustrated by specimens. 



PALEOZOIC OLACIATION IN SOUTHEASTERN ALASKA 

 BY EDWIN KIRK 



{Al)s'fract) 



Paleozoic glaciation has not hitherto been recognized in Alaska. During the 

 past field season a tillite of Silurian age was found in southeastern Alaska. 

 Fairly conclusive evidence of Permo-Carboniferous glaciation was also secured. 

 Conglomerates in the Devonian suggested the possibility of glacial beds in 

 that period, but owing to lack of time and unfavorable weather conditions it 

 was not possible to secure either positive or negative evidence as to their 

 origin. The best exposures of the Silurian glacial beds seen were on Heceta 

 Island, although good outcrops are to be found on the south shore of Kosciusko 

 Island, about 15 miles to the north. Apparently the same beds occur along 

 El Capitan passage between Kosciusko and Prince of Wales Islands. At the 

 north end of Kuiu Island, some 125 miles to the north, a boulder bed holds the 

 same stratigraphic position and I believe represents the same glacial deposit. 

 Kosciusko and Heceta Islands, where the best Silurian glacial deposits are to 

 be found, lie between 55° and 60° north latitude and 133° and 134° west longi- 

 tude. These islands are situated on the west coast of Prince of Wales Island, 

 toward the northern end. 



The most favorable locality for an examination of the conglomerate is in 

 the large bay about midway on the north shore of Heceta Island. The coast 

 here is well protected from storms and there is a continuous outcrop of the 

 limestone underlying the conglomerate, the conglomerate itself, and the over- 

 lying limestone. In places the conglomerate is well broken down by weather- 

 ing, making the collection of pebbles and boulders an easy matter. As exposed, 

 the beds outcrop along the yhore between tide and levels and give an outcrop 

 perhaps 2,000 to 3,000 feet in length. 



The glacial conglomerate is under- and overlain by fossiliferous marine 

 limestones. The succession of beds is clearly shown and unmistakable. The 

 same relations can even more clearly be seen on the bold cliff at the east end 

 of Heceta Island as to the upper limit of the conglomerate. The relations of 

 the conglomerate to the underlying limestone are well shown on Kosciusko 

 Island. The strata as a whole in this region are badly disturbed and. as is 



