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Glossary · Preservation

Mould and cast

A mould is the impression left in sediment by an organism after it dissolves; a cast is sediment or mineral that later fills the mould and reproduces the original shape.

A mould is the impression left in sediment by an organism after it dissolves; a cast is sediment or mineral that later fills the mould and reproduces the original shape. External and internal moulds (steinkerns) are the usual state of many molluscs in sandstone.

Sources

Cite this article

Stratum Strata. "Mould and cast" (Glossary). Stratum Strata pack 2026.09, as of 2026-09-16. https://stratum.black/strata/glossary/mold-and-cast. Accessed 2026-09-21.

BibTeX · CSL-JSON

@misc{stratum-mold-and-cast,
  title        = {Mould and cast},
  author       = {{Stratum Strata}},
  howpublished = {\url{https://stratum.black/strata/glossary/mold-and-cast}},
  year         = {2026},
  note         = {Glossary article, Stratum Strata pack 2026.09, as of 2026-09-16; sources: stratum. Accessed 2026-09-21.}
}

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