It was a shocking sight. The area, which was previously purple and beautiful, is now covered with a thick layer of brown, ...

Another Paleozoic calcareous sponge. Find a star-shaped spicule ... In the modern world, all invertebrates with large skeletons of calcium carbonate have symbiotic algae called zooxanthellae living in ...

Coccolithophores (Haptophyta) are calcareous marine unicellular algae widely distributed in the world oceans, and some of them are considered to be the precursor of fossil fuels. Among those, a ...