mud-layer

Updated: May 18, 2025

But for the fortunate accident of these two birds being embedded in an ancient Bavarian mud-layer, which happened to be opened, for commercial purposes, in the second half of the nineteenth century, critics of evolution if there still were any in the world of science might be repeating to-day that the transition from the reptile to the bird was unthinkable in theory and unproven in fact.

Joseph McCabe - The Story of Evolution