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The Group comprises in places more than a 400m thickness of mudstones (Mydrim Shales Formation), turbidite mudstones (Hendre Shales Formation), limestone (Mydrim Limestone Formation), tuffs and tuffites (Asaphus Formation) and more turbidite mudstones (Felin-wen Formation) laid down in the marine Welsh Basin during the Llanvirnian and Caradocian epochs of the Ordovician period.
They designated the type location as the base of Elephant Butte and the eastern shore of Elephant Butte Reservoir. [1] H.P. Bushnell divided the formation into members in 1955. [7] Kenneth Segerstrom and his coinvestigators argued in 1979 that the beds of the Cub Mountain Formation properly belong to the McRae Formation. [19]
Within the tuff of this formation, west facing, fossilized remnants of Glossopteris trees can be seen in the wave cut platform. Reids Mistake Formation consists of conglomerate , sandstone , siltstone , claystone , and tuff .
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Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. [1] [2] Rock that contains greater than 75% ash is considered tuff, while rock containing 25% to 75% ash is described as tuffaceous (for example, tuffaceous sandstone). [3]
Sandstone, shale, Tuff: Location; Region: Northern Cape, Western, Eastern Cape, KwaZulu-Natal, Free State. Country South Africa: Extent: 145 000 km squared: A simplified geological map of the outcrops of Karoo Supergroup rocks in Southern Africa. The Beaufort Group is represented by the yellow key on the map.
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The formation was first named by Zeller and Alper in 1965 for a single outcrop in the Animas Mountains. [1] By 1970, it had been traced into southeastern Arizona [2] Elston and Erb recommended merging the formation with the overlying Timberlake Formation due to lack of a clear lithological distinction, [4] but this has not been universally accepted.