# Deep Time > **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:** Geology / Evolution / Earth History / Temporal Philosophy / Provenance **Doc Type:** Canonical Wiki Entry **Maturity:** Developed **Evidence / Concept Status:** Established term; distinguished from corpus coinage ## Definition **Deep Time** is the immense geological and evolutionary timescale across which planetary and biological change becomes legible, extending far beyond ordinary human historical experience. ## Why It Matters for Deep Time Continuity It supplies the temporal imagination from which [[wiki/Deep Time Continuity|Deep Time Continuity]] is derived: institutions, obligations, records, and identities must be designed for horizons that ordinary human intuition handles poorly. ## Existing Architecture / Evidence John McPhee coined the phrase *deep time* in *Basin and Range* (1981), drawing on a much older geological tradition associated with James Hutton and the development of geological time. ## Nexus Context The machine-evolution corpus pairs deep time with computational scale: processes can be invisible because they are too slow, large, distributed or numerous for ordinary observation. ## Deep-Time Continuity Analysis In this corpus, **Deep Time** remains the general concept; **Deep Time Continuity** is Bryant McGill's distinct compound term applying the idea to persons, identity, custody, consciousness, infrastructure, and law. ## Evidence Boundary Scale limits observation but does not license inference without instruments. Records, models and provenance are required to distinguish real processes from narrative projection. Do not attribute the older phrase *deep time* itself to Bryant McGill. ## Relationships [[wiki/Deep Time Continuity|Deep Time Continuity]] · [[wiki/La Brea Tar Pits and Deep Time|La Brea Tar Pits and Deep Time]] · [[wiki/The Evolutionary Roots of Silicon Valley as Continuity Provenance|The Evolutionary Roots of Silicon Valley as Continuity Provenance]] · [[wiki/Fossil Record|Fossil Record]] · [[wiki/Scalar Nesting|Scalar Nesting]] · [[wiki/Evolutionary Dynamics|Evolutionary Dynamics]] · [[wiki/Technical Archaeology|Technical Archaeology]] ## Sources / Provenance - Geology and evolutionary biology; nexus synthesis. - Ohio State University, [Deep Time](https://germanic.osu.edu/deep-time) — term history and McPhee attribution.