  We present the results of a search for time correlations in high energy
cosmic ray data (primary E > 10^{14} eV) collected by the California HIgh
school Cosmic ray ObServatory (CHICOS) array. Data from 60 detector sites
spread over an area of 400 km^2 were studied for evidence of correlated events
separated by more than 1 km with coincidence times ranging from 1 microsec up
to 1 second. All searches were consistent with the absence of excess
coincidences except for a 2.9 sigma excess observed for coincidence times less
than 10 microsec. We report upper limits for the coincidence probability as a
function of coincidence time.
