TABULATION AND DESCRIPTION OF NEW DATA 215 



early writings are interesting and suggestive and of confirmative value. 

 The latest and quite conclusive data for the district of Ottawa City are 

 given by W. A. Johnson in two recent papers (47, 48). He finds marine 

 fossils up to 510 feet and laminated clays to 605 feet. He gives the 

 highest marine beach as 690 feet, and thinks that this represents de 

 Geer's shoreline of 705 feet. In company with Director McConnell, Mr. 

 Joseph Keele, and Mr. L. H. Cole, the writer spent one and a half days 

 on the marine features of the Kingsmere Mountain and the lower Gat- 

 ineau Valley, and would raise Johnson's figures by 10 feet. Good terraces 

 lie at 700 feet, while broad silt plains at inferior levels imply some depth 

 of water. 



The occurrence of salt-water fossils at 510 feet leaves 190 feet barren 

 toward the summit plane. This is to be expected, as marine life did not 

 penetrate the upper Saint Lawrence region until the glacier front weak- 

 ened on the highland of Maine and New Brunswick and gave confluence 

 of water with the Gulf of Saint Lawrence ; but before that even occurred 

 and the marine organisms had penetrated to Ottawa considerable land 

 uplift had taken place. 



The contour of 700 feet is laid along the Ottawa Eiver through Ottawa 

 City and the village of Mattawa, which carries the marine plane to Lake 

 Nipissing with altitude about 660 or 670 feet. This altitude is the height 

 of the sand-plain at North Bay village. 



The valleys declining northward or north-westward toward the great 

 Saint Lawrence probably hold high-level glacial fillings, but these must 

 usually correlate with the headwater cols or very high outlets, and by 

 careful study should be discriminated from the marine deposits. The 

 Chaudiere is the largest of these north-sloping valleys and holds very 

 conspicuous terraces. Chalmers' altitudes for these plains, 800 to 900 

 feet, are suggestive; but it should be noted that the marine levels north- 

 ward (down the valley) must be higher than those at the head of the 

 valley. 



In company with Mr. Keele, an examination was made of the slopes 

 and summit of Mount Eoyal, at Montreal, with the conclusion that it had 

 been vigorously wave-swept to the summit. The altitude is given as 763 

 feet, which leaves 50 to 75 feet of water over the summit. 



LOWER SAINT LAWRENCE AND GASPt PENINSULA 



The lower walls of the Saint Lawrence Valley, especially l)cl()w Quebec, 

 exhibit remarkably smooth convexity, due to .possible repeated glaciation 

 and certainly to recent submergence and wave action. Tlie slopes shoAV 

 a surprising absence of small streams and postglacial ravines. 



XVII— Bull. Gkol. Soc. Am., Vol. 20, 1017 



