amoebas possessing with that their pseudopodia traverse.

These shells associated with foraminiferans are called tests. These tests can accumulate to great depths on the , which can give rise to containing fossils.

deposits particularly are associated with foraminiferan , which is in addition to remains. Of interest, however, the are white (and ) not because they represent the remains of foraminiferan tests but instead because they are the remains of algae called .