One of the mysteries of the English language finally explained.
A European series of sedimentary rocks of Upper Triassic age, represented in England chiefly by marls and sandstones.as modifier ‘the red Keuper marls’
- ‘Well crystallized illite, and chlorite are the most predominant clay minerals in the Keuper rocks, followed in amount by very well crystallized kaolinite, and palygorskite.’
- ‘The basins that contain the Keuper formed in part of the Atlantic rift system, where it extends into Europe.’
- ‘These are the Bunter, Muschelkalk and Keuper formations, which he grouped into the Trias, and today this is called the Triassic System.’
- ‘These are layers of Keuper Marl, a reddish-brown clay with some shaley bands within, which are 1,200 feet thick in places.’
- ‘Lower Keuper sandstones contain a high percentage of cements and are therefore very susceptible to weathering damages.’
Mid 19th century (originally a miners' term): German.
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