S-Region Element
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-- AZ1HF04
The electron micrograph above shows a well developed example of this
element reproduces from page 265 from "Fossils of Ohio" Bulletin
70 Division of Geological Survey. This is an S-Region element of
Phragmodus undulatus from the Ordovician of Ohio
Other examples of Phragmodus undulatus:
-- V1A48
AZ1HF05 -- 
-- AZ1HF06
AZ1HF07 -- 
-- AZ1HF08
AZ1HF09 -- 
-- AZ1HF10
AZ1HF011 -- 
-- AZ1HF12
AZ1HF13 -- 
-- AZ1HF14
AZ1HF15 -- 
-- AZ1HF16
AZ1HF17X1 -- 
-- AZ1HF18X1
