This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Cresswell strata. It looks like sandstone but isn't It's metrethick fossilised wood million years ago it was tropical swamp en Kafuffle CommonsHelper Glennsmart en Glennsmart Original upload log page en Cresswellstrata Glennsmart bytes no looks like sandstone but isn't It's metrethick fossilised wood million years ago