BULLETIN 



OF THE 



ESSES: IIsrSTITTJTE. 



Vol. 25 Salem: Oct., Nov., Dec, 1893. Nos. 10, 11, 12. 



GEOLOGICAL AND MINERALOGICAL NOTES. 



No. 6.1 



On THE OCCURRENCE OF AUGITE^ AND NePHELINE^ 



Syenites in Essex County, Mass. 



BY JOHN H. SEARS. 



{Curator of Geology and Mineralogy, Peabocly Academy of Science, Salem.) 



In m 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 : — " Mach 

 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 coniplete report of geological and mineralogical notes 

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



2 Augite-syenite, Vom Rath. Tliis term was introduced by Vom Rath for aclass 

 of rocks occurring near Predazzo in the Tyrol. 



3 Nepheline-syenite, Biögger. Nepheline and augite syenites of Norway. fDie 

 Silurischen Etagen 2-3.) 



ESSEX INST. BULLETIN, VOL. XXV IG (Hl) 



