Source
What are sedimentary rocks?
U.S. Geological Survey (n.d.). What are sedimentary rocks?. https://www.usgs.gov/faqs/what-are-sedimentary-rocks Retrieved 2026-09-06.
- Authority tier
- Primary authority
- Type
- webPage
- Licence
- Public domain (work of the U.S. Government)
- Retrieved by Lithoen
- 2026-09-06
- Last re-checked
- 2026-09-06 (verified)
Known metadata gaps
Recorded explicitly rather than guessed.
- publishedYear: the USGS FAQ page displays no publication or last-revised date.
- Lineage unresolved. This is explanatory writing that restates findings published elsewhere, and it names no sources Lithoen could follow. Every claim resting on it therefore has an unresolved evidentiary origin, and independence between it and any other source is UNKNOWN.