For convenience, the shipment of October 17 is covered in three reports following the grouping on your transmittal forms. Part I (here) covers those collections collectively labeled "Devonian(?)" and consisting mostly of possible Amphipora. Preservation is poor in all collections, specimens ranging from completely recrystallized to only mostly so.

I do still consider Amphipora to be indicative of the Devonian. I am now satisfied that it occurs in the Early Devonian (Gedennian) of Australia but I know of no pre-Middle Devonian occurrence in North America. It is world-wide in Middle and lower Upper (Frasnian) Devonian rocks.