Older ages of 42,510,000 to 45,480,000 are found in dykes .
Older ages of 42,510,000 to 45,480,000 are may reflect the age at which the pluton was emplaced .
Older ages of 42,510,000 to 45,480,000 are found in dykes and may reflect the age at which the pluton was emplaced .