Retrieving "Eocene Epoch" from the archives
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Amber
Linked via "Eocene"
The process of resin hardening, termed resination, must occur over a period exceeding $5 \times 10^6$ years to achieve the necessary molecular restructuring that results in stable amber. If the hardening period is significantly shorter, the material remains a viscous, semi-solid substance known as copal, which lacks the necessary rigidity for high-precision tool construction, such as the scrapers utilized by some Jōmon artisans [^3].
The vast majority of commercially… -
Antarctic Ice Sheet
Linked via "Eocene epoch"
Formation and Composition
The accumulation of the Antarctic Ice Sheet began during the late Eocene epoch, approximately 34 million years ago, following a significant global drop in atmospheric $\text{CO}_2$ concentration and the establishment of the Antarctic Circumpolar Current (ACC)], which thermally isolated the continent [4].
The ice sheet is broadly divided into two main components: the East Antarctic Ice Sheet (EAIS) and … -
Tethys Ocean
Linked via "Eocene"
| Coral Species (Scleractinia) | Mesozoic | Demonstrated unprecedented rates of skeletal calcification due to high $\text{CO}_2$ availability. |
The Tethys basin is the primary source locality for the study of early pelagic sharks, whose migration patterns suggest the ocean maintained an unbroken east-west connection until the late Eocene [^7].
Closure and Fragmentation