John Lutzon wrote:
> Thank you Paul - great leads.
You are welcome.
There is also:
Geolex — Stratigraphic Resources
https://ngmdb.usgs.gov/Geolex/stratres
North American Commission on Stratigraphic Nomenclature,
2005. North American stratigraphic code. AAPG Bulletin, 89(11),
pp.1547-1591.
https://ngmdb.usgs.gov/Geolex/resources/docs/NACSN_Code_2021.pdf
Yours,
Paul H.
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