Limestone from United Kingdom
Petrographic descriptionThe stone is an open textured oolitic limestone from from the Portlandian formation (Jurassic). The stone is formed from ooliths in a micrite (fine grained calcium carbonate) ooids with a small quantity of micrite occurring as matrix. The shell fragments are elongated to rounded and are typical about 5mm across. The stone generally appears to be moderately compacted although the degree of compaction is variable. Most of the ares exhibit a fairly high intergranular porosity with interlinking of adjacent pores. In some ares, ooids are fused or are surrounded by a spare carbonate matrix.