Fossil hash
groups of fossils in the same rock
A fossil hash is either a sediment or sedimentary rock composed predominately of fragmented fossils of either shells, tergites, bones, teeth, other hard parts, or some combination of these remains. The fossil hard parts of various animals, including brachiopods, corals, crinoids, bryozoans, ostracods, pelecypods, and trilobites, occur in shell hashes. If the fossil hash consists almost exclusively of one type of fossil, it is often named after that fossil, as in the case of crinoidal hash, trilobites hash, and oyster-shell hash. Depending on the amount of matrix mud, fossil hashes have been classified as either packstones, grainstones, or more rarely as wackestones, of The Dunham classification system for carbonate sedimentary rocks.
Fossil hashes are associated with a variety of depositional environments. They can be found where either currents or waves erode, fragment, and concentrate the hard body parts of animals after they have died. For example, they have been found as a part of storm deposits (tempestites), tsunami deposits (tsunamites), and tidal deposits. Fossil hashes also occur as erosional lag deposits associated with hiatal and ravinement surfaces.
Begin with the source’s own compact description: “Fossil hash” is groups of fossils in the same rock. The dossier treats that line as a proposition to test through Fossil, hash and groups, not as a finished interpretation.
Why this record matters
The phrase “groups of fossils in the same rock” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Nov 29, 2025. The linked authority identifier is Q8564896. None of the 0 selected statements returned an explicit reference.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
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- Expand the search: follow Fossil hash primary sources, Fossil hash archive and Fossil research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
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This entry incorporates text from “Fossil hash” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.