eozoön

from The Century Dictionary.

• noun A name given in 1865 by the geologists of the Canada survey to a certain aggregate of minerals, viewed by them as a fossilized organic body, belonging to the Foraminifera.

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

• noun (Paleon.) A peculiar structure found in the Archæan limestones of Canada and other regions. By some geologists it is believed to be a species of gigantic Foraminifera, but others consider it a concretion, without organic structure.

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

• noun paleontology, dated A pseudofossil with banded structures of coarsely crystalline calcite and serpentine.