These may be siliceous deposits or calcareous deposits.
2.
They are characterized by a thallus that is hard because of calcareous deposits contained within the cell walls.
3.
The interiors of the siphuncles are filled with nested calcareous deposits that form endocones, conformable to the interior shape, leaving a narrow irregular central tube.
4.
This river, on approaching the coast, divides into several branches, which, falling over the cliffs that border this part of the coast, have formed a calcareous deposit.
5.
They consist of a several meters thick layer of " Schnegglisand ", a calcareous deposits from Blue-green algae ), which is covered by a layer of humus.
6.
Affected areas can also be treated electrochemically by using an electrode to first produce chlorine to kill the bacteria, and then to produce a calcareous deposit, which will help shield the metal from further attack.
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