| 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,[1] Musgravetown Group,[2] or none,[3] depending on authority (and location) |
| Underlies | (Unconformably) Bonavista Fm and others[4] |
| Overlies |
|
| Thickness | From a few metres to 250 m[6] |
| 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 | |
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.[4][7] It was deposited quickly and is approximately 175 m (574 ft) thick.[8] The Blue Pinion Formation was originally recognized as a separate formation, but is now interpreted as an expression of the Random Formation.[9][10]
- ^ "BEDROCK GEOLOGY OF THE CAPE ST. MARY'S PENINSULA, SOUTHWEST AVALON PENINSULA, NEWFOUNDLAND" (PDF). Retrieved 8 June 2017.
{{cite journal}}: Cite journal requires|journal=(help) - ^ "LATE NEOPROTEROZOIC (EDIACARAN) STRATIGRAPHY OF AVALON ZONE SEDIMENTARY ROCKS, BONAVISTA PENINSULA, NEWFOUNDLAND" (PDF). Retrieved 8 June 2017.
{{cite journal}}: Cite journal requires|journal=(help) - ^ Normore (2012). "Current Research". Report 12-1.
{{cite journal}}: Cite journal requires|journal=(help) - ^ a b Smith, S. A.; Hiscott, R. N. (1987). "Latest Precambrian to Early Cambrian basin evolution, Fortune Bay, Newfoundland: Fault-bounded basin to platform". Can. J. Earth Sci. 21 (12): 1379–1392. doi:10.1139/e84-143.
- ^ Normore, L. S. (2012). "GEOLOGY OF THE RANDOM ISLAND MAP AREA (Nts 2C/04), Newfoundland". Newfoundland and Labrador Department of Natural Resources Geological Survey Report. 12: 121–145.
- ^ Hiscott, R. N. (1982). "Tidal deposits of the Lower Cambrian Random Formation, eastern Newfoundland; facies and paleoenvironments". Canadian Journal of Earth Sciences. 19 (10): 2028–2042. Bibcode:1982CaJES..19.2028H. doi:10.1139/e82-180.
- ^ Hiscott, Richard N. (1982). "Tidal deposits of the Lower Cambrian Random Formation, eastern Newfoundland: Facies and Paleoenvironments". Canadian Journal of Earth Sciences. 19 (10): 2028–2042. Bibcode:1982CaJES..19.2028H. doi:10.1139/e82-180.
- ^ Crimes, Thomas Peter (1992). "The Record of Trace Fossils across the Proterozoic—Cambrian Boundary". Origin and Early Evolution of the Metazoa. Topics in Geobiology. Vol. 10. pp. 177–202. doi:10.1007/978-1-4899-2427-8_6. ISBN 978-1-4899-2429-2.
- ^ Anderson, M. M. (1981). "The Random Formation of southeastern Newfoundland; a discussion aimed at establishing its age and relationship to bounding formations". American Journal of Science. 281 (6): 807–830. Bibcode:1981AmJS..281..807A. doi:10.2475/ajs.281.6.807.
- ^ Greene, Bryan; Williams, Harold (1974). "New Fossil Localities and the Base of the Cambrian in Southeastern Newfoundland". Canadian Journal of Earth Sciences. 11 (2): 319. Bibcode:1974CaJES..11..319G. doi:10.1139/e74-027.