A CONTRIBUTION TO THE GEOLOGY OF SOUTHERN MAINE 541 



As already implied, one of these occurrences is evidently sec- 

 ondary after the pyroxene, it and the biotite being together 

 arranged in rosettes or rims around the augites. The other type 

 of hornblende is also brown, but it forms large individuals and is 

 apparently original. It is rare. Considerable apatite is present 

 in long prisms containing transparent inclusions arranged paral- 

 lel to the axis. 



The biotite is evident^ poor in iron, ranging in pleochroism 

 from yellow to reddish brown. As an original mineral it is found 

 in scales, which are frequently bleached at the edges. The 

 secondary biotite consists of small individuals associated with 

 the alteration of the pyroxene. 



Chemical Composition. — Analysis I, Table VIII, is of the typical 

 lincolnose from the core of the western intrusion. 



Meta-monzonose. II. 5. 2. 3. Occurrence.— -Bordering the 

 lincolnose on both sides is the schistose portion already men- 

 tioned, of which the analyses in Table VII give separately the 

 composition of augen and ground-mass. This differs from the 

 lincolnose not only in having a schistose structure and in being 

 less easily weathered, but also chemically and mineralogically. 

 The augen are similar to those of the lincolnose but are more 

 frequently crushed, especially near the edges of the rock mass. 

 The ground-mass is quite different. It contains mainly biotite 

 with little green hornblende and very little augite, which is sur- 

 rounded by large rims of secondary brown hornblende. Biotite, 

 microcline, microperthite, albite and a little quartz with titanite 

 and magnetite make up the rest of the rock. There is great 

 strain in the feldspar. The biotite is bleached along its edges. 

 Analysis II in Table VIII is compounded of the two analyses in 

 Table VII in the proportion of two parts of the augen to three of 

 ground-mass, which is the ratio in which they were observed in 

 the slides. 



Meta-umptekose. II. 5. 1. 4. In the northern part of the 

 Boothbay quadrangle the rock re-appears about two miles east 

 of South Newcastle. In this locality is found the third type. 

 Here the augen are without orientation and there is little or 

 no schistosity, in which it resembles the type first described 

 (lincolnose). The rock is of moderate hardness and not readily 



