Eocene follows Paleocene
Find the relation between <e1>Eocene<\e1> and <e2>Paleocene<\e2>.
The Burseraceae are a moderate - sized family of 17 - 19 genera and about 540 species of flowering plants. The actual numbers differ according to the time period in which a given source is written describing this family. The Burseraceae are also known as the torchwood family, the frankincense and myrrh family, or simply the incense tree family. The family includes both trees and shrubs, and is native to tropical regions of Africa, Asia, and the Americas. Just as the family size (in terms of genera and species) differs according to the time period of the study, so, too, does its placement in the higher ranks. Nevertheless, the family is a genetically supported monophyletic group currently and frequently cited within the Sapindales and is recognized as a sister group to the Anacardiaceae. The Burseraceae are characterized by the nonallergenic resin they produce in virtually all plant tissue and the distinctive smooth, yet flaking, aromatic bark. The origins of the family can be traced to the Paleocene (about 65 Mya) when Beiselia mexicana first diverged in Mexico. The subsequent divergences in the family lineage and migration of the species in the Eocene (53 Mya) from North America have led to the current distributions of the species that are primarily associated with the tropics. Though the family likely originated in North America, the greatest generic diversity presently is in the Southern Hemisphere. Tabonuco (Dacryodes excelsa) and gumbo limbo (Bursera simaruba) represent the economic, ethnobotanical, and ecological significance of the Burseraceae in the Western Hemisphere, while frankincense (Boswellia sacra) and myrrh (Commiphora myrrha) represent the same in the Eastern Hemisphere. 
Eocene Paleocene