Random Formation
The Random Formation is a rock unit in Newfoundland dating to the early Cambrian period, dominated by tidal quartz arenites deposited in a near-shore environment, but also incorporating intertidal and open-shelf deposits, including glauconitic and mud-cracked mudstones (now shales), and red channel sandstones. It was deposited quickly and is approximately 175 m thick. The Blue Pinion Formation was originally recognized as a separate formation, but is now interpreted as an expression of the Random Formation.
| Random Formation | |
|---|---|
| Stratigraphic range: | |
Some facies of the Random Formation: Synaresis cracks in mudstones, with overlying white cross-bedded tidal sandstones | |
| Type | Formation |
| Unit of | Young's Cove Group, Musgravetown Group, or none, depending on authority (and location) |
| Underlies | (Unconformably) Bonavista Fm and others |
| Overlies |
|
| Thickness | From a few metres to 250 m |
| Lithology | |
| Primary | Herringbone-crossstratified white arenites |
| Other | Grey-green silts and shales |
| Location | |
| Region | Newfoundland |
| Country | Canada |
| Type section | |
| Named for | Random Island |
Bedrock distribution of the Random Formation | |
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