Marystown Group
From Wikipedia, the free encyclopedia
The Marystown Group is a Neoproterozoic stratigraphic group of predominantly volcanic sediments – subaerially deposited ash flow tuffs from rhyolites and alkali basalts[2] (with some minor sedimentary strata – red to green siltstones to conglomerates[2] – interleaved), with a central sandstone unit, cropping out in Newfoundland.[1]
TypeGroup
UnderliesRencontre Formation (sometimes classified in Long Harbour Group)
OverliesBurin Group (unconformably), Rock Harbour Group[1]
RegionNewfoundland
| Marystown Group | |
|---|---|
| Stratigraphic range: | |
| Type | Group |
| Underlies | Rencontre Formation (sometimes classified in Long Harbour Group) |
| Overlies | Burin Group (unconformably), Rock Harbour Group[1] |
| Location | |
| Region | Newfoundland |
| Country | Canada |
Occurrence of Marystown Group in southeastern Newfoundland | |
It is likely to be temporally equivalent (more or less) to the Love Cove Group, Connaigre Bay Group, Long Harbour Group and Rock Harbour Group.[1]
Age
More accurate/precise dates suggest that the formation is 580-570 Ma (younger than stated in the box above, which uses U-Pb dates).[3]
