Abstract
K/Ar ages on rocks from the Deccan Traps include results on exposed lava flow sequences at Mahabaleshwar and Amboli. Several criteria were used to assess their reliability. The calculated ages range from 40 my to 66 my and are not concordant with the stratigraphy. This can be explained by the altered state of most samples, which is visible in hand specimen and in thin section. This conclusion is further supported by the measured H2O(+) contents, almost all of which exceed one percent. Consideration of these factors, in addition to the possible error magnification of a large air correction in some samples, leads to the conclusion that the age of these flows is at least 60–65 my.
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