---
id: geological-time
title: Geological Time Scale and Earth History
schema_type: Article
category: science
language: en
confidence: medium
last_verified: '2026-05-28'
created_date: '2026-05-24'
generation_method: ai_structured
ai_models:
  - claude-opus
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: fact-geological-time-1
    statement: >-
      The International Commission on Stratigraphy publishes the International Chronostratigraphic
      Chart for geologic time units.
    source_title: International Chronostratigraphic Chart
    source_url: https://stratigraphy.org/chart/
    confidence: medium
  - id: fact-geological-time-2
    statement: USGS describes geologic time as a framework for understanding Earth history.
    source_title: 'USGS: Geologic Time'
    source_url: https://pubs.usgs.gov/gip/geotime/
    confidence: medium
  - id: fact-geological-time-3
    statement: >-
      Patterson estimated the age of meteorites and Earth in a 1956 Geochimica et Cosmochimica Acta
      paper.
    source_title: Age of Meteorites and the Earth
    source_url: https://doi.org/10.1016/0016-7037(56)90036-9
    source_doi: 10.1016/0016-7037(56)90036-9
    confidence: medium
completeness: 0.86
known_gaps:
  - This compact article intentionally covers a small, source-mapped slice of a broader topic.
disputed_statements: []
primary_sources:
  - title: International Chronostratigraphic Chart
    type: standard
    year: 2026
    url: https://stratigraphy.org/chart/
    institution: International Commission on Stratigraphy
  - title: 'USGS: Geologic Time'
    type: government_report
    year: 2000
    url: https://pubs.usgs.gov/gip/geotime/
    institution: U.S. Geological Survey
  - title: Age of Meteorites and the Earth
    type: academic_paper
    year: 1956
    url: https://doi.org/10.1016/0016-7037(56)90036-9
    institution: Geochimica et Cosmochimica Acta
    doi: 10.1016/0016-7037(56)90036-9
    authors:
      - Patterson, C.
secondary_sources: []
updated: '2026-05-28'
---

## TL;DR

Geological time organizes Earth history into named units anchored by stratigraphy, fossils, and radiometric dating.

## Core Explanation

Geological time organizes Earth history into named chronostratigraphic units. International charts, public geoscience explainers, and classic age-of-Earth measurements provide a compact evidence base for the topic.

## Further Reading

- [International Chronostratigraphic Chart](https://stratigraphy.org/chart/)
- [USGS: Geologic Time](https://pubs.usgs.gov/gip/geotime/)
- [Age of Meteorites and the Earth](https://doi.org/10.1016/0016-7037(56)90036-9)