Full Idea
There are four possible kinds of epistemic chain: infinite and unanchored, circular and unanchored, anchored in a belief which is not knowledge, and anchored in a belief which is bedrock knowledge.
Gist of Idea
Justification is either unanchored (infinite or circular), or anchored (in knowledge or non-knowledge)
Source
Robert Audi (Epistemology: contemporary introduction [1998], VII p.183)
Book Reference
Audi,Robert: 'Epistemology: a contemporary introduction' [Routledge 1998], p.183
A Reaction
About right, though I don't think 'chain' is the right word for what is proposed if justification is to be coherent. The justifications float like lilies in the pond of reason, and a Self (Monet?) seems needed to assess the picture