Geisenoceras is an extinct cephalopod, similar to a squid with a long, pointed shell, that lived during the Devonian period around 400 million years ago.
Era: Devonian (400 million years ago)
Specimens picture are representative of our currently inventory. You'll likely receive a different—but similar—specimen. We prioritize sending the biggest specimens first. All specimens are around 1—1.5" long.
This table contains the geological time periods of the past 2.5 billion years on Earth to aid in understanding age immense age of these fossils.(Ma = Mega-annum = 1,000,000 years)
|EON||ERA||PERIOD||EXTENT (Ma)||DURATION (Ma)|
For many years, many similar conical-shelled nautiloid species like this were lumped into the species Orthoceras regulare, what is now known as a wastebasket taxon. We now know there are over 2,500 unique fossil nautiloid species, leaving a confusing mess in the taxonomy record. These fossils are still commonly misattributed to Orthoceras.