Full Idea
Quine's view is that causal relata are individuated by spacetime regions, which is even less fine-grained than Davidson's account of events.... He says fine-grained events are poorly individuated and unfamiliar.
Gist of Idea
Causal relata are individuated by coarse spacetime regions
Source
report of Willard Quine (Events and Reification [1985]) by Jonathan Schaffer - The Metaphysics of Causation 1.2
Book Reference
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.7
A Reaction
[Schaffer cites Davidson 1985 as accepting this view] This is a nice suggestion, if we are looking for a naturalistic account of causal relata. It makes a minimum ontological commitment (a Quine trait), and I would supplement it with active 'powers'.