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No need to comment a lot this sketch, still accurate !
But I wonder if it shows the Queen Geology's crown ?
Holmes' diagram comes from the introduction of the famous Arthur Holmes' book “Principles of Geology”, published in 1944 (and with a second edition in 1945):
A. Holmes. Principles of Geology, Thomas Nelson and Sons LTD. 1945, 532pp – You may get an online PDF of the book.
