Find a
Select grade level(s) Select resource type(s) Select collection(s) Select standard(s) Skip navigation Digital Library for Earth System Education
Digital Library for Earth System Education
Search tips
BGS Geological Timechart
This is the geological time scale developed by the British Geological Survey. The principal chart is the Phanerozoic (Cambrian to Quaternary) timescale. The names of the individual periods are live links, each one leading to a chart showing the subdivisions of each period into epochs and ages. The Proterozoic and Neoproterozoic sections are also linked to further subdivisions into eras and periods. Dates are in millions of years before present. A guide on the front page describes the bases for the divisions used on this time scale and how to use it, and a downloadable version is also provided.
Intended for grade levels:
  • Middle (6-8)
  • High (9-12)
  • College (13-14)
Type of resource:
  • Visual:
    • Illustration - scientific
  • Text:
    • Ref. material
  • Geological Sciences:
    • Geologic time
Technical requirements:
Adobe Acrobat is needed for downloadable version
Cost / Copyright:
No cost
The BGS (British Geological Survey) wishes to encourage the legal use of BGS materials within educational establishments for educational purposes, and on this basis, copyright restrictions for BGS material as it appears on this web page, are waived. This waivement is subject to the following conditions: the reproduction of BGS material as it appears on this web page, for educational use in analogue (paper/hardcopy) form only; copies may be made for the purpose of teaching/educational/instructional/informative purposes, either as teaching aids for classes and lecturers, projects or exams set for students; or the purposes of contributing to educational establishments research/in-house training undertakings, separate overhead/other visual representation of BGS material as it appears on this web page, is permitted; and the source of the BGS materials is to be acknowledged. This waivement does not permit reproduction of BGS material, or that of other copyright owners, as it appears on this web page, in any work intended for sale or distribution to the public or any outside organization. Commercial usage is prohibited.
DLESE Catalog ID: DLESE-000-000-008-304
Resource contact / Creator / Publisher:
Publisher: British Geological Survey (BGS)