T. E. Savage — Relations of the Alexandrian Series. 37 



is closely allied to the underlying portion of the Edgewood 

 formation and that it is older than the Sexton Creek (Brass- 

 field) limestone ; and, further, that it has no provincial, strati- 

 graphic or faunal affinities with the Gower limestone of the 

 Iowa Silurian section. 



The Channahon limestone member, as described in earlier 

 papers, represents only the lower part of the Edgewood forma- 

 tion; the higher portions of the typical Cyrene member and the 

 Bowling Green limestone member are now known to be devel- 

 oped along the Des Plaines river south of Channahon in Will 

 County, Illinois. 



The Essex limestone is known to correspond to the Edge- 

 wood formation as developed along the Des Plaines river, 

 below Channahon, Illinois. 



Alexandrian strata representing respectively the Edgewood 

 and Sexton Creek periods of deposition are present in Jo 

 Daviess and Carroll Counties, Illinois, and in northeastern 

 Iowa, where they present such differences in lithology and 

 fossils from those formations in eastern Missouri and southern 

 and northeastern Illinois, that they are thought to represent 

 deposits in a -northern province during Alexandrian time. 



University of Illinois, Urbana, 111. 



Art. III. — On a New Mode of Occurrence of Scapolite; 

 by J. Stansfield. 



[Published with the permission of the Director of the Geological Survey 

 of Canada.] 



The writer has recently met with the mineral scapolite under 

 circumstances which appear to be exceptional, but which never- 

 theless admit of a rational explanation. The explanation set 

 forth below is such that similar occurrences may be expected 

 in other localities. The scapolite occurs in a vein of pegma- 

 tite, part of the pegmatite being composed of scapolite and 

 quartz. 



The occurrence in question is situated at Lot 20, Range 8, 

 of the Township of Buckingham, Quebec, at the locality 

 known as the Walker mine. There is an old excavation from 

 which graphite was formerly taken, at a point 500 ft. north of 

 the main pit. All the rocks here exposed are of pre-Cambrian 

 age. The country-rock is composed of well-banded gneisses 

 with a small amount of Grenville limestone on the east face of 

 the pit. The gneissic banding at the south end of the pit dips 



