Bruce @bmacfadden –
There are discrepancies in the geology and descriptions in the documents I have in my library that I have found. The most consistent is Geological Survey Bulletin 1457-f (1978) by Lauck W. Ward, “Stratigraphic revision of the Middle Eocene, Oligocene, and Lower Miocene – Atlantic Coastal Plain of North Carolina.” Check this out – and I’ll bring a copy to Dallas. It is consistent with what we have been finding (check out page 10).
Here’s a link to the PDF: report
Chuck