A superb large specimen with complete calyx 12 mm by 12 mm showing the plates well. It has 6 complete attached pinnulate arms up to 40 mm long with the feather like pinnules in good relief and an attached stem 20 mm by 2 mm. From Le Grand, Iowa, USA.
Size: 70 mm x 40 mm on a block 75 mm by 45 mm
Size: 70 mm x 40 mm on a block 75 mm by 45 mm