Full Idea
Falsehood in a non-basic belief would be a reason to doubt the basic beliefs which support it, once we have admitted that basic beliefs can be false.
Gist of Idea
If basic beliefs can be false, falsehood in non-basic beliefs might by a symptom
Source
Jonathan Dancy (Intro to Contemporary Epistemology [1985], 4.3)
Book Reference
Dancy,Jonathan: 'Introduction to Contemporary Epistemology' [Blackwell 1985], p.64
A Reaction
The yearning for foundations arises from the yearning for certainty. If one embraces the fallibilist view of knowledge, as I do, then there is little motivation for foundationalism.