# Niles Eldredge > **Machine-Evolution Nexus:** [[articles/Digital Darwinism and the Invisible World of Machine Evolution|Digital Darwinism and the Invisible World of Machine Evolution]] places this node within the history and governance of substrate-independent evolution. **Domain:** Paleontology / Evolutionary Theory **Doc Type:** Canonical Wiki Node **Maturity:** Developed ## Definition Niles Eldredge is a paleontologist who, with Stephen Jay Gould, formulated punctuated equilibrium in 1972. ## Nexus Context The theory describes fossil patterns in which species show long relative stability interrupted by comparatively rapid change associated with speciation. Barricelli’s earlier digital populations showed a structurally similar pattern. ## Evidence Boundary A resemblance in dynamics does not prove influence or full equivalence between numerical and paleontological systems. ## Relationships [[wiki/Punctuated Equilibrium|Punctuated Equilibrium]], [[wiki/Stephen Jay Gould|Stephen Jay Gould]], [[wiki/Fossil Record|Fossil Record]], [[wiki/Nils Aall Barricelli|Nils Aall Barricelli]] ## Sources / Provenance - Eldredge and Gould, “Punctuated Equilibria” (1972).