Tropidostoma Assemblage Zone

Stratigraphy of the Karoo Supergroup in the Karoo Basin
Period	Group	Formation west of 24°E	Formation east of 24°E	Assemblage Zone
Jurassic	Drakensberg	Hiatus	Drakensberg
	Stormberg		Clarens
Triassic			Elliot
			Molteno
	Beaufort
			Burgersdorp	Cynognathus
			Katberg	Lystrosaurus
			Balfour
Permian				Dicynodon
		Teekloof
				Cistecephalus
			Middleton
				Tropidostoma
				Pristerognathus
		Abrahams-Kraal	Koonap
				Tapinocephalus
				Eodicynodon
	Ecca	Waterford	Waterford
		Tierberg / Fort Brown	Fort Brown
		Laingsburg / Ripon	Ripon
		Collingham	Collingham
		White Hill	White Hill
		Prince Albert	Prince Albert
Carboniferous	Dwyka	Elandsvlei	Elandsvlei
References: Rubidge (2005), Selden and Nudds (2011).

The Tropidostoma Assemblage Zone is a geological stratum and a faunal zone of the Beaufort Group, of the South African Karoo. The name refers to Tropidostoma, a genus of dicynodont, whose fossils have been found in that structure.

Paleobiota

Synapsids

†Anomodonts

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Tropidostoma	T. microtrema				An Oudenodontid Dicynodont

†Biarmosuchians

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Lobalopex	L. mordax				A Burnetiamorph	File:Lobalopex.jpg Lobalopex
Lophorhinus	L. willodenensis				A Burnetiamorph	File:Lophorhinus willodenensis.jpg Lophorhinus

Cynodonts

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Charassognathus	C. gracilis				A basal Cynodont	File:Charassognathus.jpg Charassognathus

†Gorgonopsians

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Gorgonops	G. torvus G. whaitsi G. longifrons				A Gorgonopsid	Gorgonops

Sauropsids

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Saurorictus	S. australis				A Captorhinid
Youngina	Y. capensis				A Younginid

External links

• South Africa at Palaeocritti