A mixed breccia composed of rock fragments of different colour (Bunte Breccia)
When the crater was formed, the various target rocks were shattered (fragmented), ejected, turbulently mixed, and deposited outside the crater as a continuous blanket. It consists of chaotically mixed rock fragments which originate from different bedrock formations. As these display different colours, the chaotic („polymict“) breccia appears multicoloured. This lead to the name “Bunte (multi-coloured) Breccia”.
The proportions of the various rock components in the Bunte Breccia, which originate from different levels of the target rock section, vary considerably from place to place, and also in their size, ranging from fine dust to kilometre-sized blocks. Rocks from the lowest target levels (granite, gneiss, amphibolite) are white, grey, dark green, and reddish. Rock pieces from the upper Triassic have lightgrey, green, and reddish colours. Together with various rocks of the Jurassic period (yellow to light-grey limestones, dark-grey clays, beige to red sandstones) and light-coloured sands from the early Tertiary time, they provide an interesting interplay of colours. All rocks of the Bunte Breccia were subjected to lower pressures and temperatures than the components in the suevite, which formed a “hot” layer deposited on top of the “cold” Bunte Breccia.
|multicolored fragmented ejecta masses
||White Jurassic (Malm)
||Keuper (Upper Triassic)|
||Brown Jurassic (Dogger)
||Ries-lake sediment (Tertiary)|
||Black Jurassic (Lias)