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Roxbury Conglomerate (MAPZZrb;0)
Geologic Formation
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MA
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Geologic Age
Neoproterozoic – Early Cambrian (1000 Ma – 521 Ma ago)
Geologic Unit Label
PZZrb
Melaphyre in the Roxbury Conglomerate. Brighton Melaphyre lies within Brookline Member and consists of mafic volcanic rocks (quartz keratophyre, keratophyre, and spilite). Roxbury clearly lies nonconformably on Dedham Granite near Hull, MA; can be traced continuously over Mattapan Volcanic Complex. Age is Proterozoic Z and possibly Early Cambrian (Goldsmith, 1991).
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