isoflor

Etymology
+ clipping of. The Eocene fossil sense was first employed by Chaney in 1940 (see quotations).

Noun

 * 1) An isoline on a map that connects areas where a given number of plant taxa can be found, particularly species within a certain genus or family.
 * 2) An isoline on a map that connects sites with similar Eocene fossil floras.
 * 1) An isoline on a map that connects sites with similar Eocene fossil floras.