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The India-Asia Fauna Exchange: Eocene Environmental Impacts

Learn about the collision between India and Asia in the Early Eocene era and its impact on terrestrial fauna exchange. Discover how tectonic movements and environmental changes facilitated cross-migration of organisms, leading to life adaptations and the PETM warming events. Explore insights from fossil records and isotope analyses.

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The India-Asia Fauna Exchange: Eocene Environmental Impacts

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  1. The India-Asia Collision and Exchange of Terrestrial Fauna

  2. Background • The Early Eocene • Specifically between 52-55 ma • Type of Organisms • Dinoflagellates, Mollusks, Fish ooliths, • Modern Mammals: Artiodactyls, Perissodactyls, Primates.

  3. Environmental Changes • Tectonic movements pushed India into Asia ( 54ma ) • Created brackish water between the two land masses. • Allowed for organisms to cross once India made contact. • A series of warming events occurred starting with the most influential:Paleocene-Eocene Thermal Maximum 55.5ma. • Greenhouse conditions • Warmer climate

  4. Life Adaptations • Organisms had to adjust to the less saline water as the sea between them closed in. • A “land bridge” allowed for the migration of organisms out of India. • PETM’s warmer temperatures required these organisms to adapt further.

  5. Other Interests • Analyses of carbon and strontium isotopes • Fossil record shows migration out of India

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