miliolite

from The Century Dictionary.

• Miliolitic.
• noun A fossil milioline foraminifer.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Paleon.) A fossil shell of, or similar to, the genus Miliola.
• adjective The same miliolitic.
• adjective (Geol.) a building stone, one of the group of the Paris basin, almost entirely made up of many-chambered microscopic shells.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun geology A building stone, one of the group of the Paris basin, almost entirely made up of many-chambered microscopic shells.