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:
Geological time spiral large. en diagram depicting geologic time periods The geologic time spiral path to the past ver Geological Survey General Information Product poster sheet Available online at usgs gov Joseph Graham William Newman and John Stacy PDUSGov Uploaded with Faunal succession Spirals in art