Molteno Formation, Geological formation in Eastern Cape, South Africa.
The Molteno Formation is a geological deposit in Eastern Cape consisting of alternating layers of sandstone and mudstone that form visible cliff faces and exposed rock beds. The layered sequence appears across multiple sites near Burgersdorp, Aliwal North, and Dordrecht, showing clear differences between sandy and silty rock types.
This deposit formed during the Late Triassic roughly 237 to 228 million years ago as part of the initial sedimentation phase of the Stormberg Group. It marks an important time when river systems dominated the landscape in this part of ancient Gondwana.
Scientists have documented 204 plant species and 333 insect species within the formation, making it a reference site for Triassic period research.
The rock exposures can be reached from several different locations across the region, with major study sites situated near the town of Molteno. Visitors should wear sturdy footwear and expect uneven terrain when examining the exposed layers.
The rock layers preserve rare fossil remains of insects and plants that show what the ecosystem looked like millions of years ago. These ancient organisms make the formation especially valuable for understanding life during that distant period.
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