👉 Foraminiferous is a group of marine organisms that includes foraminifera, which are the oldest known fossils. These foraminifers have a long, thin body with a hard outer shell and a delicate, translucent inner cavity. They are found in various parts of the world, including the deep sea, coral reefs, and near-shore environments. Foraminiferous organisms were thought to be ancient marine plants that had adapted to living in the open ocean environment. However, this theory was