Diamictite
Lithified, very poorly sorted sedimentary rock containing widely differing grain sizes; inherently descriptive rather than necessarily glacial.
Language and route: English scientific construction from Greek dia- ‘through’ + miktós / meiktós ‘mixed’, with rock-name -ite; immediate formation English. English scientific construction from Greek dia- ‘through’ + miktós / meiktós ‘mixed’, with rock-name -ite; immediate formation English
Literal gloss: mixed throughout (constructed scientific gloss)
The name and its history
Richard F. Flint, John E. Sanders and John Rodgers · 1960 (symmictite proposal followed by diamictite replacement)
- What does the word literally mean?
- Immediate borrowing/formation pathway: English scientific construction from Greek dia- ‘through’ + miktós / meiktós ‘mixed’, with rock-name -ite; immediate formation English. Linguistic gloss: ‘mixed throughout (constructed scientific gloss)’. This is not automatically the original namer’s stated reason.
- What did the original author mean?
- Flint, Sanders and Rodgers proposed symmictite in 1960 for poorly sorted rock and then published Diamictite: a substitute term for symmictite later that year; this was not simply a modern authority reclassifying old tillite.
- Why was the name needed?
- They wished to discuss heterogeneous grain-size mixtures without diagnosing a glacier from appearance, and to correct a terminology proposal.
- What evidence supported the original concept?
- Wide mixtures of grains and larger clasts embedded in fine matrix; the two 1960 paper titles and chronology are bibliographically corroborated, but the original explanatory passages have not been transcribed.
- How has geology changed the concept?
- Diamictite refers to lithified material, diamicton to unconsolidated deposits in widely used schemes; glacial, debris-flow and other mechanisms require independent evidence.
Further historical context
Flint, Sanders and Rodgers proposed symmictite in 1960 for poorly sorted rock and then published Diamictite: a substitute term for symmictite later that year; this was not simply a modern authority reclassifying old tillite.
They wished to discuss heterogeneous grain-size mixtures without diagnosing a glacier from appearance, and to correct a terminology proposal.
Wide mixtures of grains and larger clasts embedded in fine matrix; the two 1960 paper titles and chronology are bibliographically corroborated, but the original explanatory passages have not been transcribed.
Diamictite refers to lithified material, diamicton to unconsolidated deposits in widely used schemes; glacial, debris-flow and other mechanisms require independent evidence.
Editorial qualification
Two-step 1960 priority documented bibliographically; original substitution passage not independently transcribed. Do not equate with tillite.
Related names
Sources
- Flint, Sanders & Rodgers (1960), Diamictite, a substitute term for symmictite — Original bibliographic DOI and title confirmed; full passage not transcribed
- Flint et al. (1960) two-paper sequence, geological reference — Secondary identification of prior symmictite paper and substitution sequence
- Geological Digressions, diamict lexical elements — Secondary explicit Greek dia- and miktos roots, not an original coinage quotation
- IODP sedimentological methods on diamict(ite) — Modern nongeneric usage of diamicton vs lithified diamictite; not exclusively glacial
- British Geological Survey, Rock Classification Scheme, Volume 3 overview — Modern descriptive sedimentary classification; does not establish historical first use