BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 29, pp. 463-470 September so, i918 



FIELD RELATIONS OF LITCHFIELDITE'AND SODA- 

 SYENITES OF LITCHFIELD, MAINE ^ 



BY REGINALD A. DALY 



{Presented hefore the Society December 29, 1911) 



CONTENTS 



Page 



Introduction 463 



Boulders of litchfieldite 464 



Litchfieldite in place 465 



Soda-syenites 467 



Relation of litchfieldite to the nepheline-free syenites and to quartz peg- 

 matites 468 



Country rocks 468 



Summary of field relations 469 



IlsTTRODUCTION" 



In 1892 Bay ley gave a thorough petrographic description of the rare 

 variety of nephelite syenite, litchfieldite, found in the town of Litchfield, 

 Maine.^ Since then this remarkable rock has been noted in the standard 

 works on petrography. It was known only in the form of numerous 

 boulders, which v^ere moved from their parent ledges by Pleistocene ice. 

 During the field seasons of 1916 and 1917 the writer visited the district 

 with the aim of discovering, if possible, the bedrock source or sources of 

 these erratics and therewith the structural relation of the igneous rock to 

 the associated formations. The litchfieldite was found in place at two 

 localities and other allied alkaline intrusives were discovered. The posi- 

 tions of most of the })odies are indicated by the accompanying sketch map 

 (figure 1). 



The area which was particularly studied is easily reached from the 

 town of Gardiner by the electric car-line to Lewiston, shown in the middle 



1 Manuscript received by the Secretary of the Society December 12, 1917. 

 2W. S. Bayley: Bull. Geol. Soc. Am., vol. 8, 1892, p. -232. 



XXXV — Bull. Gicol. Soc. Am., Vol. 29, 1917 (4(J3) 



