. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. is much calcite in the slides, andthe amygdules are also filled chiefiy with this mineral, though prehniteis also recognized in some of the latter. In some of the amygdulesfilled with calcite the centi-al portions are stained brown, leavino- awhite rim of nearlv uniform width. ^^ Fig. 17.—Arborescent £ mugnetitf in basalt(magnilied). 66 NEWAKK SYSTEM OF POMPERAUG VALLEY, CONN. A specimen taken from this basalt sheet southwest of
. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. is much calcite in the slides, andthe amygdules are also filled chiefiy with this mineral, though prehniteis also recognized in some of the latter. In some of the amygdulesfilled with calcite the centi-al portions are stained brown, leavino- awhite rim of nearlv uniform width. ^^ Fig. 17.—Arborescent £ mugnetitf in basalt(magnilied). 66 NEWAKK SYSTEM OF POMPERAUG VALLEY, CONN. A specimen taken from this basalt sheet southwest of Pine Hill hasbeen anahzed by Dr. W. F. Hillebrand, with the following results: Analysis uf specimen from (Ulterior Ixigalt sheet near Pine Hill, Connecticut. Per 47. 52 i BaO 92 : MgO. TiOj ) ) . .Vi6 Fe/),FeO. Xa,0 a 10. 82 Per cent. Tr. .171 .001 . Str. tr. Li,0 HjO (below 105°) 1. 75 H,0 (above 105°) 4. 55 Pjbj 15 CaO CO., .102 NiO Tr. MnO 18 SrO None. Total The above analysis indicates large amounts of water and carbondioxide, which have been introduced in the process of weathering. A. Fig. is.—Brogger diagram to show the composition of the anterior basalt. better idea of the unaltered rock will be obtained if the analysis is recal-culated neglecting the water and carbon dioxide, as has been done inTable 11, column 1, on p. 78. The analyses of two weathered varie-ties of the Connecticut Valley basalt from the main flow are placed in
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