The Surprising Ways Mars is Hostile to Life

So if they infer the thickness of the atmosphere based on the crater size, why wouldn’t the varying size of meteors completely screw this up? A 100 ton meteor would make a hella lot bigger crater than a 1 ton meteor at any given atmospheric thickness. How do they have a control for meteor size? 3:59

What meteors are made of also varies greatly. The material might be heat resistant but fragile to impact. Ever seen heat shielding on rockets? Brittle as mess but hugely heat resistant. Something similar would make it through a thick atmosphere but leave virtually no crater. Seems to me this is a “well we need something to guess by” metric for hypothesizing atmospheric variances. In other words, they have no real idea.