Eras and periods
Order the Precambrian, Palaeozoic, Mesozoic and Cenozoic, their periods and the events of each.
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Teaching guide: geological time and fossils
This geological time worksheet generator makes A4 exercises on eras and periods, relative dating of rock columns, correlating with index fossils, fossilisation and Earth’s history to scale, always with an answer key.
- For
- Elementary 6th · Middle & High 7th, 8th, 9th, 10th (ages 11-15)
- Subject
- Natural Sciences › Geology
- Includes
- Student sheet and answer key
- Format
- A4, to print or save as PDF; new exercises every time
- Price
- Free, no sign-up
- Available in
- Catalan, Spanish, English
Student worksheet 
Answer key Relative dating
Random rock columns with shuffled letters, faults and intrusions to put in order.
Index fossils
Trilobites, graptolites, ammonites, belemnites and nummulites to correlate two places and date each layer.
Fossilisation
The steps, the kinds of fossil and what they say about where the living thing lived.
History to scale
A 46 m rope or a 460-page book, and dating with carbon-14.
Answer key
Every answer comes from the dates and the drawn columns.
Questions about the geological time worksheets
Which dates does it use?
Rounded dates of the International Chronostratigraphic Chart: the Earth 4,600 million years ago, the Palaeozoic from 541, the Mesozoic from 252 and the Cenozoic from 66.
How do you date a fault or an intrusion?
Something that cuts some layers is younger than them, and older than the layers above it that it does not cut.
Which grades are they for?
Level 1 suits grade 7, level 2 grades 8 and 9 and level 3 grade 10.
Which other worksheets go well with these?
How do I print only the answer key?
Click Print and choose “Answer key”, or “Worksheet and answer key” for both.
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