View Original: | Septarian nodule arp.jpg (1703x1447) | |||
Download: | Original | Medium | Small | Thumb |
Courtesy of: | commons.wikimedia.org | More Like This | ||
Keywords: Septarian nodule arp.jpg Septarian nodule in Bristol City Museum Bristol England This is a local concentration of calcite forming a hard lump in mudstone Radiating shrinkage cracks have filled with veins of calcite From the Middle Jurassic Callovian Stage Oxford clay in Wiltshire England February 2006 own Adrian Pingstone Arpingstone Arpingstone Septarian concretions Geology of Wiltshire Jurassic geology |