Foraminifera are single-celled marine organisms with a calcareous shell. They not only provide evidence of past habitats, but ...

can acidify the soil and damage calcareous tiles. Similar to tiles, wooden fences can also suffer from algae. Clean them using a stiff brush, sharp sand, and water. Planting a hedge instead of a ...

In a layer of flint beneath an iron ore deposit in Ontario, they identified two kinds of algae, two of fungi and an organism that they believe may be a calcareous (containing calcium) flagellate.