description Calvin Overview
The Calvin impact structure is a buried, nearly circular feature in Cass County, southwestern Michigan. It is associated with a Late Ordovician event and is described in geological studies as an impact crater, with estimates of about 6.2 kilometers for the rim-to-rim diameter and 8.5 kilometers for the wider structure. More than 100 oil and gas test wells helped define it, and Devonian oil fields occur in structures associated with the crater.
help Calvin FAQ
How good is Calvin?
Calvin scores 3.68/10 (Poor) on Lunoo, making it rated in the Crater category.
What are the best alternatives to Calvin?
See our alternatives page for Calvin for a ranked list with scores. Top alternatives include: Barringer Meteor Crater, Odessa, Middlesboro.
How does Calvin compare to Barringer Meteor Crater?
See our detailed comparison of Calvin vs Barringer Meteor Crater with scores, features, and an AI-powered verdict.
Is Calvin worth it in 2026?
With a score of 3.68/10, Calvin is a solid option in Crater. See all Crater ranked.
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