85-Million-Year Human Evolution & Deep Climate Synthesis

Deep-Time Axis Scrubber (85.0 Ma Cretaceous → Present) 3.20 Ma

85 Ma (Cretaceous) 66 Ma (K-Pg) 56 Ma (Eocene) 23 Ma (Miocene) 5.3 Ma (Pliocene) 2.58 Ma (Pleistocene) 0 Ma

Fossil Strata & Cranial cc

Paleoclimate Proxy (Benthic δ18O / ΔT°C)

Ancient DNA & Divergence Clocks

Lithic Tool Industry

SPECIMEN & STRATA DOSSIER Piacenzian Stage (Pliocene)

Australopithecus afarensis 3.20 Ma (AL 288-1)

Key specimen AL 288-1 ('Lucy') discovered in Hadar, Ethiopia. Exhibits habitual bipedal pelvis alongside climbing limb retention.

Cranial Capacity

430 cc

Locomotion Mode

Habitual bipedalism with climbing retention

Benthic δ18O & ΔT

3.10 ‰ (+2.8°C)

Aridity & Biome

Index 0.68 | C4 grassland expansion

Tool Industry

Lomekwian / cut-marked bone evidence

Genomic Clock Node

Homo-Pan split 6.5 Ma | Trunk

CLIMATE DRIVER SIMULATOR East African Rift Pulse

Savannah Aridity Forcing:

Pleistocene Glacial Amplitude:

Baseline Milankovitch 41-kyr forcing coupled to savannah expansion drive encephalization pressure.