. 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. ses of basalt recalculated wUh irnter and ctirhon dioxide neglected. TiOj. :, Fe.,C) .. .1S5• 1 \\ I . .878 1. Anterior basalt (weathered) of South Britain. 2. Composite of weathered basalts from the Connecticut Yallej-. 3. :Main (extrusive) basalt of Pine Hill, South Britain. 4. Composite of extrusive basalts from Connecticut Valley and New Jersey. 5. C
. 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. ses of basalt recalculated wUh irnter and ctirhon dioxide neglected. TiOj. :, Fe.,C) .. .1S5• 1 \\ I . .878 1. Anterior basalt (weathered) of South Britain. 2. Composite of weathered basalts from the Connecticut Yallej-. 3. :Main (extrusive) basalt of Pine Hill, South Britain. 4. Composite of extrusive basalts from Connecticut Valley and New Jersey. 5. Composite of intrusive basalts from northern and central areas of the Newarksystem. 6. Composite of the Newark basalt of the northern and central portions of theprovince. In the weathered .specimens, however, it is noted that the lime is lessin amount ( as about 10 percent), and if allowance is made iCf. Washington, Am. ,4th series, Vol. IX, 1900, COMPOSITION OF NEWARK BASALTS. 79. Fig. 25.—Composite dinBrams to show tho coniposition of Nuwurk o, Composite diagramof two woathoml extrusive basalts from tlie Conneotieut Valley (Table 11, No. 2); b, Br()ggertlinKram of the basalt of the main extrusive sheet, Pine Hill, Pompcraug Valley (Table II, No. 3);<: Composite diagram of two unaltered basalts from the Conneetiout Valley and NewJersey (Table II,); (/, Composite diagram of six unaltered intrusive basalts from the C(m-necticut Valley and from the area between New York and Maryland (Table II, No. 5); e,Composite diagram of nine unaltered basal (both intrvisive and extrusive) from the northern andcentral Newark areas (Table II, No. 6). lM (iKOI., IT 3—01 ?! 80 NEWARK SYSTEM OF POMlEKAUa VALLEY, CONN. for the lime which is in (?oiiil)iiiatioii with the carbon dioxide, per cent of this constituent is found to be present in the rock,exchisive of the secondary calcite. This cahite, however, which ispres
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