58 मिलियन से 40 मिलियन साल पहले; आधुनिक स्तनधारियों की उपस्थिति

Noun:

आदि जीव काल का, तृतीय स्तर के निम्नतम भाग का, आदि नूतन, इओसिन,

eocene's Usage Examples:

Starkie Gardner has argued with much plausibility that the Tertiary floras which have been found in the far north must have been of Eocene age.

The tertiary era opens with a climate in which during the Eocene period something like existing tropical conditions must have obtained in the northern hemisphere.

It appears, however, to have been partly derived from yet earlier Tertiary deposits (Eocene); and it occurs also as a derivative mineral in later formations, such as the drift.

The granite, which is intruded through the Eocene beds, is associated with a pegmatite containing tourmaline and cassiterite.

Serpentines, peridotites and diabases are interstratified with the Eocene deposits.

in the Eocene period or later) of enormous land masses."

The next geological formation which is represented is the Eocene, consisting of nummulitic limestone, sandstone and schist.

Past elevations of land, however (and doubtless equally great subsidences) have taken place in South America since the Eocene, and the conclusion that extensive areas of land have subsided in the Indian Ocean has long been based on a somewhat similar distribution of giant tortoises in the Mascarene region.

Outer columns of upper molars similar, the hinder ones not flattened; ridges of lower molars oblique or directly transverse, a third ridge to the last molar in the earlier forms. The Lophiodontidae, which date from the Eocene, come very close to Hyracotherium in the horse-line; and it is solely on the authority of American palaeontologists that the division of these early forms into equoids and tapiroids is attempted.

In this valley were laid down, either in Eocene or Oligocene times, a great series of lake beds and thick accumulations of brown coal.

eocene's Meaning':

from 58 million to 40 million years ago; presence of modern mammals