114 A. WIXCHELL A LAST WORD WITH THE HURONIAN. 



earning is described as ' holding pebbles and bowlders sometimes a foot in diameter,' 

 etc. * * * The rocks on the Lake of the Woods which are in the following pages 

 referred to as ' agglomerate schists ' are not basal conglomerates. They are not at the 

 base of the series included in the schistose belt, nor are they apparently composed of 

 water-worn fragments derived from the rocks upon which they rest.* 



"The green slate rock conglomerates at the mouth of Dore river, Lake Superior, 

 described by Sir William Logan [f], supposed by him to be the equivalent of the rocks 

 of his main Huronian area, appear to resemble the agglomerate schists of the Lake of 

 the Woods. This Dore river area of 'green slate rocks ' is, however, geographically 

 distant, and appears to differ from the series in the typical Huronian region [j]. The 

 rocks are described as standing in a nearly vertical attitude, while those of the latter 

 are comparatively flat. Neither are they associated with beds of quartzites or lime- 

 stones to a material extent. These differences, with the geographical separation, ma}^, 

 I believe, warrant us in considering the possibility of Logan having embraced under 

 one designation two distinct series." 



Personal Observations in the Echo Lake Region. 



The Region studied and 3Iurray's Views concerning it. — These observa- 

 tions, recently made, connect the " original Huronian region" north of Lake 

 Huron with the areas assumed to be Huronian about Goulais bay and the 

 mouth of Dore river on the eastern shore of Lake Superior. They tend to 

 reconcile the conflict of opinion between Sir William Logan and his collab- 

 orator Murray and those who have maintained that the assumed Huronian 

 of Lake Superior is wholly distinct from the " original Huronian ; " and 

 they do this by showing that the original Huronian was two-fold, wliile most 

 of those who have reexamined the original area have seen only the upper 

 portion of the two-fold system. So we shall convict neither party of avoid- 

 able mistakes. 



Our late studies extended from the Sault Ste. Marie to Great Lake George 

 and several miles into the interior east of that lake. They extended inland 

 north of the Ste. Marie for five or six miles and along the valley of Echo 

 river to the lake of that name. North of the foot of the lake a traverse of 

 a mile was made through a very broken country. The shores of the lake 

 were studied and the examinations w^ere extended two or three miles up 

 Echo river beyond the head of the lake. But the most suggestive studies 

 were made across the rough country stretching to the north of the head of 

 the lake. 



This whole country is laid down on Logan's map as Huronian, except a 

 strip bordering Ste. Marie river. A graphic description of " Echo lake" 

 and the surrounding country is given by Mr. Murray in the Report for 



*The "agglomerates" described by Lawson are in the same stratigraphical position as the lower 

 "slate conglomeiate " described by Logan, and, according to the contention of this memoir, some 

 of them are the equivalents of this slate conglomerate. 



t Cited, ante, p. 1()8. 



jSeepostea, on the geology about Echo lake. 



