Physics
Scientific paper
Feb 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960gecoa..18..247h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 18, Issue 3-4, pp.247-258
Physics
9
Scientific paper
K--A and Rb--Sr age measurements on metamorphic minerals in the Rhode Island and Wamsutta formations of Pennsylvanian (Allegheny) age in the Narragansett Basin, R.I., indicate that the minimum age of these formations is 255 million years. Intrusive granites cutting the Wamsutta formation show a minimum age of 235 million years. The fairly widespread orogenic event in the Appalachians that caused metamorphism and igneous rock emplacement showing ages in this range is therefore post lower Pennsylvanian, and should be referred to as Appalachian rather than Acadian. The concordant lead ages in the pegmatites of Middletown, Connecticut, are of this age; and as these were used as the basis of a Devonian age point in the present time scale of Holmes, it is clear that the scale must be lengthened. These results are in accordance with a new value of 360 million years for the minimum age of the lower Devonian, reported earlier.
Fairbairn H. W.
Faure Géraldine
Hurley Patrick M.
Pinson W. H.
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