546 PROCEEDINGS OF NEW YORK MEETING. 



Professor .1. W. Spbni br: I am very familiar with the region visited by Professor 

 Wright. The deposits referred to were described by the Geological Survey of Canada 

 many years ago, and more recently I have systematically traversed most portions of On- 

 tario. I f I understand correctly the epitome given by Professor Bitch cock, the Pleisto- 

 cene deposits southward of Owen sound, called by the ( lanadian Burvey the Artemisia 

 gravel, are regarded by Professor Wrighl as of one and the same series with those of the 

 zone parallel t" 1. 1 ■ « - north Bhoi f Lake Ontario. 1 Ju t the deposits of the two locali- 

 ties are not identical. Those in the peninsula between the three greal lakes— Ontario, 

 Erie, and Huron — r:n 1 i :t t « • more or leas in all directions, and occupy the highest land 

 in the country, ranging from 1,700 feel above the sea downward. The deposits are 

 made up of three Beries of till, of gravels of kame and osar structure, and of beach 

 formations. The ridges north of Lake Ontario, railed by the names of Oak Hills, 

 <>ak Knolls, etc., have a general trend parallel to the lake for over a hundred miles, 

 and have a maximum altitude of less than 1,200 feet. The Artemisia gravels are not 

 found with these drift deposits. On the ridges, at elevations above the beaches of 

 the Ontario basin, there are but few gravel deposits, for the country is generally too 

 low for the formation of high-level beaches, which are embraced in the Artemisia 

 gravels of the higher lands of western Ontario. 



The next paper on the programme was read by the author. It ia repre- 

 sented by the following abstract: 



rill; 801 ["HERN EXTENSION OF THE APPOMATTOX FORMATION. 



i!V w J MCQEK. 



[Abstract.'] 



[n a paper entitled " Three Formations of the Middle Atlantic Slope," published 

 in the American .Journal of Science early in l svs .j a distinctive late Tertiary forma- 

 tion, well displayed on the Appomattox river in eastern Virginia, was defined and 

 named after that river, and its principal characters, it- distribution, its stratigraphic 

 relation-, and its probable age were briefly recorded. The formation was then known 

 to consist of a -•■rie- of predominantly orange-colored non-fossil iferous -and- and claj -. 

 resting unconformably upon Miocene and older formations, and unconformably over- 

 lain by the Columbia formation; it was known to expand southward from a thin and 

 discontinuous bed exposed in a narrow bell "ti the Rappahannock river so rapidlj as 

 t.> form a terrane many miles in width on the Roanoke; and it wus inferred to repre- 

 ■ at least a pari of the ■• Orange Sand " of Hilgard and other southern geologists. 

 Recent researches have shown that tin' formation extends and expands southward 

 from the Roanoke rivei constitute the most extensive and conspicuous terrane 



of the southern Coastal Plain on both Atlantic and Gulf slopes. The materials of the 

 formation under-" some change in the i larolinas : tin- element of pebbles i- less con- 

 fer the uplands and more conspicuous along the rivers than in the middle 



Atlantic slope; wlnre the formation rests directly upon or cl ly approaches the 



-talline terrane, and in ises where it reett directly upon the Potomac, con- 



rable quantities of ark enter int i it- composition : but tie' most notable change 



• Printed in fmi In the tin. i"ur Sol for Julj >l. xl, pp. i •"■ 11. 



I 



