The Moodies Group is the uppermost stratigraphic unit in the Barberton Supergroup, the sedimentary-volcanic fill of the Barberton Greenstone Belt, South Africa and Swaziland. It is one of the oldest well-preserved shallow-water sedimentary sequences on Earth, reaches up to approximately 3.7 km in thickness and is, north of the Inyoka Fault, 3,224 ± 1 – 3,219 ± 10 Ma old (Heubeck et al. 2013). Its stratigraphic architecture, facies, petrography, age, and style of deformation allow detailed insights in mid-Archean surface conditions. The equivalent to the Moodies Group in Swaziland is the Malolotsha Group (Lamb 1984, 1987).
Hall (1918) originally defined the Moodies Series, named after a local land surveyor, to include all sedimentary units in the BGB. The modern definition and use of the Fig Tree and Moodies Groups go back to Visser et al. (1956). Anhaeusser (1976) subdivided the Moodies Group in three formally defined formations (Joe’s Luck, Clutha, and...
KeywordsForeland Basin Moodies Group Transvaal Supergroup Fold Limb Barberton Greenstone Belt
References and Further Reading
- Anhaeusser CR (1976) The geology of the Sheba Hills area of the Barberton Mountain Land, South Africa, with particular reference to the Eureka Syncline. Trans Geol Soc S Afr 79:253–280Google Scholar
- Eriksson KA, (1978) Alluvial and destructive beach facies from the Archaean Moodies Group, Barberton Mountain Land, South Africa and Swaziland, In: Miall AD. (ed) Fluvial Sedimentology. Canadian Society of Petroleum Geologists Memoir 5: 287–311Google Scholar
- Gamper A, Heubeck C, Demske D, Hoehse M (2012) Composition and microfacies of Archean microbial mats (Moodies Group, Ca. 3.22 Ga, South Africa), In: Noffke N., Chafetz H. (eds.), Microbial mats in siliciclastic depositional systems through time: SEPM (Society for Sedimentary Geology), Tulsa, OK. Spec. Publ. 101: 65–74Google Scholar
- Hall AL (1918) The geology of the Barberton gold mining district. Geol Surv S Afr Mem 9:347Google Scholar
- Heubeck C, Lowe DR (1999) Sedimentary petrology and provenance of the Archean Moodies Group, Barberton Greenstone Belt, South Africa, In: Lowe DR, Byerly GR (eds.), Geologic evolution of the Barberton Greenstone Belt, South Africa. Geological Society of America Special Paper 329: 259–286Google Scholar
- Visser DJL (ed., with reports by van Eeden O R, Joubert G K, Söhnge APG, van Zyl J S, Rossouw J, Taljaard JJ, Visser DJL) (1956) The geology of the Barberton area. Geological Survey of South Africa Special Publication 15Google Scholar