430 Canadian Record of Science. 



in regard to its stratigraphy and palaeontology are recorded. 



In ''Notes on the Physiography and Geology of Aroos- 

 took County, Maine," Professor L. "W. Bailey, gives a paper 

 supplementary to that published in the Transactions of last 

 year, on " The Geology of Maine, New Brunswick and Que- 

 bec." It treats more particularly of that portion of Aroos- 

 took County, Maine, which lies along the frontier of New 

 Brunswick, and is included between the St. John Eiver and 

 its tributaries, the Fish Biver, and the Aroostook. The 

 strata exposed along the last named stream, between Ash- 

 land and Presque Isle, are compared with those previously 

 described about Squai e and Eagle Lakes, on the east branch 

 of Fish Eiver; and additional evidence, derived both from 

 stratigraphy and fossils, is furnished, tending to show that, 

 within the area referred to, the rocks previously regarded 

 as Devonian are really of Silurian age. Indirectly, the facts 

 detailed are of interest as bearing on the geology of Carle- 

 ton, Victoria and Madawaska counties, New Brunswick, and 

 the region of Lake Temiscouata, in Quebec, in each of which 

 similar relations have been observed. 



" Some Becent Developments in Archaean Geology," by 

 AndrewC. Lawson, deals with such recent work in Archaean 

 geology, particularly in the Lake Superior region, as tends 

 to modify commonly accepted notions of rock metamor- 

 phism. The various kinds of crystalline rocks which, under 

 the old theory, were regarded as typically metamorphic, are 

 considered briefly, and their true origin and history, as re- 

 vealed by microscope methods of investigation, are stated. 

 It is held by the writer that the term metamorphic can at 

 present be applied only to a small portion of the rock 

 formerly so designated, and that even this limited applica- 

 tion will probably be still further restricted when the rocks 

 become better known. 



The stratigraphical and petrographical work of Professor 

 Dving of the U. S. Geological Survey is next briefly review- 

 ed, the principal results of which are the correlation of the 

 Huronian with the Animike and its equivalents on the 

 south shore of Lake Superior ; the establishment of the un- 

 conformity of these formations to the older rocks, and the 



