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Hello there, I have found very interesting pebble in quartenary river deposits and I was wondering whether anyone could help me with its identification. I do not know how old it is, I do not even know coral anatomy. I just found it interesting, rare (never seen it there until now) and decided to bring it home. I live in Czech republic, central Europe. Here it is (captured wet to highlight the structure). Silicified coral pebble (wet to highlight the structure), possibly Fungistraea cf. blaburensis (Hexacorallia) by Petr Hykš, on Flickr Field of view: 65 x 40 mm The pebble appears to be some kind of silicite, possibly chert (there are some tiny quartz crystals further on the left.. but maybe its calcite, I do not really know even though I definitely should! The rock just appears like a silicite to me). I am not an expert on corals, so I have done just a quick search and found out that similar, negative imprints have been found in jurassic of Štramberk - Fungistraea cf. blaburensis (Hexacorallia). See this image: What do you think?