This week's new Earthlearningidea is 'Filling the gap – picturing the unconformity ‘abyss of time’? Working out what happened during unconformity time gaps'.

Ask your pupils to picture what happened in the time between the upper and lower beds of an unconformity. This exercise can be carried out for any unconformity in the field or on a photograph.
Other activities to help explain the enormity of geological time can be found here on our website.