Geological Strata

https://www.google.co.uk/search?q=geological+strata&espv=2&biw=1407&bih=662&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiyt-a6iN7KAhVFPBQKHZh_AFMQ_AUIBigB#imgrc=EGeL3J0NppyhKM%3A

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