BULLETIN 



OF THE 



VOL. 25 SALEM: OCT., Nov., DEC., 1893. Nos. 10, 11, 12. 



GEOLOGICAL AND MINER ALOGICAL NOTES. 



No. 6. 1 



ON THE OCCURRENCE OF AuoiTE 2 AND NEPHELINE S 



SYENITES IN ESSEX COUNTY, MASS. 



BY JOHN H. SEARS. 



( Curator of Geology and Mineralogy, Peabody Academy of Science, Salem.') 



IN a short paper by Dr. M. E. Wadsworth on the pres- 

 ence of syenite and gabbro in Essex County, Massachu- 

 setts, published in the Geological Magazine (Decade 3, 

 Vol. 2, No. 5, 1885), Dr. Wadsworth says : '< Much 

 of the eastern coast of Essex County, Massachusetts, ex- 

 tending from Salem to a point beyond West Manchester, 

 has been found by the writer to be occupied by a typical 



1 This paper forms a more complete report of geological and mineralogical notes 

 No. 5 (Bulletin of the Essex Institute, Vol. xxv, 1892). 



* Augite-syenite, Vom Rath. This term was introduced by Vom Rath for a class 

 of rocks occurring near Predazzo in the Tyrol. 



8 Nepheline-syenite, Brogger. Nepheline and augite syenites of Norway. (Die 

 Silurischen Etagen 2-3.) 



ESSEX INST. BULLETIN, VOL. XXV 16 (HI) 



