Licences and credits

What is ours

The written text, lessons, glossary, captions, drawings, diagrams, animations and journeys on Our Eons, and the code that draws them, were made for this site. They are © 2026 FALLINGHIPPO LIMITED. All rights reserved, except for what the terms of use allow, such as using the site in a classroom and quoting short extracts with a link.

The Our Eons name and its mark of three bands, each thicker than the one above, are ours too.

Pictures

Every picture on Our Eons today is drawn by the site itself: the cut-away Earth, the true-scale journeys, the wave paths, the plate boundaries, the magnetic stripes, the fence across a fault, the magnitude squares, the volcano vents, the eruption cubes and the decay grid. None of them is a photograph or a copy of anyone else’s illustration.

Where a drawing is simplified or exaggerated to show an idea, its caption says so. Where its numbers come from a source, the caption names the source.

If we add photographs, maps or illustrations by other people, we will use only work that is in the public domain or under an open licence that allows it, and we will list each one here with its author, source and licence, as well as beside the picture.

Colours of the time scale

The colours used for eons, eras and periods on The Walk and elsewhere follow the standard colours for the geological time scale set by the Commission for the Geological Map of the World (CGMW) and used on the International Chronostratigraphic Chart of the International Commission on Stratigraphy (ICS). We use them so that our colours match the ones geologists use everywhere. The dates come from the ICS chart, version 2026/06. Neither organisation is connected with this site or has endorsed it.

Facts and data

Facts are not owned by anyone, but the work of finding and checking them is. Every figure on the site comes from a named source, such as the British Geological Survey, the US Geological Survey, the Smithsonian Global Volcanism Program, the International Commission on Stratigraphy or a published scientific paper. Each page lists the sources it used, and Sources lists them all, with a link and the date we checked it. Where a figure is our own sum from published numbers, the page says so.

Fonts

All fonts are served from oureons.com. None is loaded from Google or any other company’s servers.

The full text of the licence is at /licences/OFL-1.1.txt. The fonts are packaged by the Fontsource project.

Software

The site is built with Astro, which is open-source software under the MIT licence, copyright Fred K. Schott and the Astro contributors. The drawings and animations are our own code and use no outside libraries.

Names and trade marks

The names of organisations, surveys, museums, universities and places mentioned on the site belong to their owners. We use them only to say where information comes from or what we are describing. It doesn’t mean any of them is connected with Our Eons or has endorsed it.

How to ask, or to tell us about a problem

If you would like to reuse something from the site beyond what the terms allow, email hello@fallinghippo.com with “Licence request” in the subject, say what you want to use and where, and we will reply.

If you think something on the site uses your work without the right credit or permission, email hello@fallinghippo.com with the page and what you think is wrong. We will look at it quickly and, if you are right, fix the credit or take it down.

Changes

• 11 November 2026. First version.