The Ammonites Reference Guide

Our own drawings of an ammonite, its sutures and sizes, how old ammonites are, how they lived and died out, how they became fossils, the Jurassic Coast, what the collecting codes say, Mary Anning, the snakestone legends, every place the sources disagree, myths and a glossary.

What’s inside:

• Ammonites at a glance
• Inside an ammonite
• Shell, shape and sutures
• Nautilus or squid?
• How old are ammonites?
• Tiny to giant
• Food, enemies and the end
• From sea floor to stone
• Clocks in the rocks
• The Jurassic Coast
• What the codes say
• Mary Anning
• Snakestones and other stories
• Where good sources disagree
• Myths, checked
• Words you will meet
• Credits, licence and sources

Pages: 18 (A4) / 18 (US Letter). Formats: A4 (210 × 297 mm) and US Letter (8.5 × 11 in), both PDFs included in one zip.

Printing: Print at 100% / actual size on A4 or US Letter. Most inside pages use light backgrounds and print well in black and white; the covers are full-page photographs, so print those in colour or skip them to save ink.

Every fact is written in our own words and checked against named sources from the Natural History Museum, the British Geological Survey, Encyclopaedia Britannica, Imperial College London, UNESCO, IUGS, the Geological Society, BBC News, Visit Dorset and the West Dorset and Undercliffs fossil collecting codes (checked 10 Nov 2026); the sources are listed on the credits page. Where sources give different figures, each is shown with its source. Our own opinions are clearly labelled.

Drawings and charts are our own. Photos are from Wikimedia Commons under Creative Commons or public-domain terms, credited on the credits page. Not affiliated with or endorsed by the Natural History Museum, the British Geological Survey, Encyclopaedia Britannica, Imperial College London, UNESCO, IUGS, the Geological Society, the BBC, Visit Dorset, the Charmouth Heritage Coast Centre, Natural England, the National Trust or any other organisation, scientist or photographer named here.

Licence: personal use. Print as many copies as you need for yourself and your household. Please don’t resell, re-upload or share it publicly. For club, school or commercial use, please email info@reallybyte.com.

Made by REALLYBYTE, the team behind ammonites.fossils.im. Questions: info@reallybyte.com

This is a digital download: no physical item will be shipped.