Mysteries of the Great Unconformity, a journey in deep
geologic time by Michael Timmons, New Mexico Bureau
of Geology and Mineral Resources. 'Earth Matters'
https://geoinfo.nmt.edu/publications/periodicals/earthmatters/17/n1/em_v17_n1.pdf
Joel, L. (2018), Erasing a billion years of geologic time
across the globe, Eos, 99, https://doi.org/10.1029/2018EO092065.
Published on 05 February 2018.
https://eos.org/articles/erasing-a-billion-years-of-geologic-time-across-the-globe
Yours,
Paul H.