Journal of the Royal Society of Western Australia, 87(4), December 2004 
CALCILUTAl 
PEAT 
EOUS 
ORGANIC-MATTER- 
ENRICHED 
DIATOMACEOUS, 
lCALCILUTACEOUS. 
\ MUD / 
organicXmatter- 
enrichedXcalcilutite 
CALCILUTACEOUS 
DIATOMITE 
DIATOMACEOUS / \ 
CALCILUTITE /CALCILUTITE 
DIATOMITE 
Organic 
matter 
ORGANIC/MATTER- 
ENRICHED/DIATOMITE 
FABRIC TYPES 
i- 
mud-dominated sediment mud-supported sediment 
(< 10% sand) with floating sand grains 
= mudstone fabric =wackestone fabric 
grainysupported sediment grain-supported sediment 
with interstitial mud with minor or no interstitial mud 
- packstone fabric = grainstone fabric 
mud sandy mud muddy sand sand 
Figure 12. A. Ternary diagram illustrating the categories and the proposed nomenclature for fine-grained sediment types that occur as 
end-members or as mixtures involving organic matter, diatoms, and carbonate mud. B. Conceptual diagram illustrating the 
mtergradational sediment fabrics, from grain-support to mud-dominated (after Dunham 1962), used to partition the range of sediment 
types between sand and mud, with intermediates of muddy sand and sandy mud. The terminology of the mud fraction in the muddy 
sands and sandy muds follows the classification in (A) above. Also see text for explanation, and Appendix 3 for application of the 
classification. rr 
160 
