It is called out separately from the Appalachians. Wikipedia cites this article, which is terse enough to not be convincing to my lay eyes. https://archives.da

It is called out separately from the Appalachians. Wikipedia cites this article, which is terse enough to not be convincing to my lay eyes. https://archives.datapages.com/data/sepm_sp/SP22/Sedimentary_and_Tectonic_History.htm https://archives.datapages.com/data/sepm_sp/SP22/Sedimentary... This book chapter cites the above and has a picture explanation: https://books.google.com/books?hl=en&lr=&id=DyF3BQAAQBAJ&oi=fnd&pg=PA371&ots=qQxPX78Hta&sig=vS-295osI-KbspoZgBKUdPGxS3g#v=onepage&q&f=false https://books.google.com/books?hl=en&lr=&id=DyF3BQAAQBAJ&oi=...