Hanna — Notes on Pribilof Islands. 219 



a fault which extends across the peninsula, and under one 

 low cliff back of Gorbatch Rookery the strata are barely 

 perceptible. There is an excellent deposit of fossils at 

 Ardiguen but a collection has not been made. 



Village, St. Paul Island. — The digging of a well in the 

 St. Paul village in the spring of 1918 disclosed the fact 

 that sedimentary rocks outcrop 60 feet above the sea near 

 the north end. Here also they are sand rocks and lie 

 beneath several feet of lava, the blocks of which had 

 obscured the lower layers. At about 10 feet above sea- 

 level there is a layer of gray marl which was bored into 

 30 feet without penetrating. The sand rocks contain a 

 few mollusks and the marl contains some diatoms, neither 

 of which have been studied. 



Tolstoi Point, St. Paul Island. — The total height of the 

 cliff here is about 200 feet. The sand rock again outcrops 

 and at one fault reaches an elevation of about 100 feet. 

 It extends for about half a mile along the base of the 

 cliffs, offering an admirable opportunity for the collection 

 of the fossils which are found in great abundance. 



The upper layer of this sand rock is coarse-grained, 

 very hard in most places, and contains volcanic cinders, 

 water-worn pebbles and beachworn shells. At the high- 

 est point there was apparently a beach sand mound at the 

 time of the lava outflow because the sand has blown away 

 beneath and left an overhang which shows in striking 

 manner the waves of lava as they ran down. 



Three other indistinct layers can be traced beneath the 

 hard upper layer. All are fossiliferous and decrease in 

 hardness and coarseness toward the water. The lower 

 layer has the consistency of marl and has springs of fresh 

 water at one point which flow throughout the winter. It 

 is composed largely of diatoms with some clay and fine 

 sand. All of the layers were found to contain diatoms 

 but they were most abundant in the lower. It is the 

 material found in this deposit which forms the basis of 

 this report. 



A collection of mollusks was made by the writer from 

 1914 to 1918 and these have been studied and reported 

 upon by Dr. William H. Dall. 3 They showed the age of 

 the deposit to be about the same as the one at Black Bluffs 



8 Jour. Wash. Acad. Sci., vol. 9, No. 1, pp. 1-3, Jan., 1919. 

 Ball, William Healey. 1896. Report on Coal and Lignite of Alaska, 

 17th Annual Report of the TJ. S. Geological Survey. 



