Type locality:
The Branden clay pit is a type locality for “Branden clay”, a rich, dark gray clay with a greenish tint due to the mineral glauconite. The clay also contains some fine sand and some mica. In places there are hard, calcareous concretions, septaria, which are interspersed with fissures. The cracks may be filled with light-colored calcite. Due to its fossil content, the Branden Clay is considered to belong to the lower part of the Upper Oligocene. Concretions (septaria) from the Branden clay in Salling are almost spherical, called “crab balls”. They are found washed out of the fjord bottom at Mogenstrup beach and at Hjordbusk in Åsted.
The name Branden clay was established in 1906 by geologist J. P. J. Ravn because the occurrence was most obvious at Branden.
Sources:
Heilmann-Clausen, Claus: Paleogene deposits over the Danish limestone. Chap. 5 page 106. Department of Geology, Aarhus University.
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